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Scientific Data Documentation
National Hospital Discharge Survey, 1990-1991
DSN: CC36.NHDS90 
     CC36.NHDS91

ABSTRACT

 This material provides documentation for users of the National Hospital
 Discharge Survey (NHDS) data tapes.  The NHDS is conducted annually by the
 National Center for Health Statistics (NCHS).  Section I describes the
 survey and includes information on the history and scope of the NHDS, the
 methodology followed, including data collection and medical coding
 procedures, population estimates, measurement errors and sampling errors.
 Section II gives technical details of the tape including number of tracks
 and record length.  Section III provides a detailed description of the
 contents of each data record, including the coding and location of each
 data element.  Appendix A defines certain terms used in this document;
 Appendix B lists the ICD-9-CM Addenda;  Appendix C provides population
 estimates to allow the user to calculate rates; and Appendix D provides
 unweighted and weighted frequencies for selected descriptive variables.

DESCRIPTION OF THE NATIONAL HOSPITAL DISCHARGE SURVEY

 Introduction.--This document and its appendices allow one to use the data
 tape containing information collected by the 1991 National Hospital
 Discharge Survey conducted by the National Center for Health Statistics.
 This survey annually collects medical and demographic information from a
 sample of hospital discharge records, which serves as a basis for
 calculating statistics on hospital utilization.  The sampled discharge
 records represent inpatients discharged from a national sample of non-
 Federal short-stay hospitals.  For a description of the survey design and
 data collection procedures, see below.  For a more detailed description of
 the survey design, data collection procedures, and the estimation process,
 see Reference 1.  Publications based on the data for each survey year can
 be obtained from the Government Printing Office.

 History.--To provide more complete and precise information on the
 utilization of the Nation's hospitals and on the nature and treatment of
 illness among the hospitalized population, in 1962 the NCHS began
 exploring possibilities for surveying morbidity in hospitals.  A national
 advisory group was established.  The NCHS conducted planning discussions
 with other elements of the Public Health Service.  Hospitalization
 material from the Survey Research Center of the University of Michigan,
 the American Hospital Association, and the Professional Activities Study
 was examined and evaluated.  In 1963, a study by the School of Public
 Health of the University of Pittsburgh under contract to the NCHS
 demonstrated the feasibility of an NHDS type of program.  An additional
 pilot study using enumerators from the Bureau of the Census was conducted
 in late 1964 and confirmed the University of Pittsburgh's findings.

 Finally, with advice and support from the American Hospital Association,
 the American Medical Association, individual experts, other professional
 groups, and elements of the U.S. Public Health Service, the NCHS initiated
 the National Hospital Discharge Survey in 1964.

SURVEY METHODOLOGY
 Introduction
 Source of the Data.--The National Hospital Discharge Survey (NHDS) covers
 discharges from noninstitutional hospitals, exclusive of Federal,
 military, and Veterans Administration hospitals, located in the 50 States
 and the District of Columbia.  Only short-stay hospitals (hospitals with
 an average length of stay for all patients of less than 30 days) or those
 whose specialty is general (medical or surgical) or children's general are
 included in the survey.  These hospitals must also have six or more beds
 staffed for patient use.  These criteria, used from 1988 through the
 current survey year, differ slightly from those used prior to 1988.

 Beginning with 1988, the NHDS sampling frame consisted of hospitals that
 were listed in the April 1987 SMG Hospital Market Tape (2), met the above
 criteria, and began accepting patients by August 1987.  For 1991 the
 sample consisted of 528 hospitals.  Of the 528 hospitals, 7 were found to
 be out of scope (ineligible) because they went out of business or
 otherwise failed to meet the criteria for the NHDS universe. Of the 521
 inscope (eligible) hospitals, 484 hospitals responded to the survey.

 Sample design and data collection

 The NCHS has conducted the NHDS continuously since 1965.  The original
 sample was selected in 1964 from a frame of short-stay hospitals listed in
 the National Master Facility Inventory.  That sample was updated
 periodically with samples of hospitals that opened later.  Sample
 hospitals were selected with probabilities ranging from certainty for the
 largest hospitals to 1 in 40 for the smallest hospitals.  Within each
 sample hospital, a systematic random sample of discharges was selected.  A
 report on the design and development of the original NHDS was published
 (1).

 In 1988, the NHDS was redesigned to provide geographic sampling
 comparability with other surveys conducted by the NCHS; to update the
 sample of hospitals selected into the survey; and to maximize the use of
 data collected through automated systems.  The redesigned NHDS sample
 included with certainty all hospitals with 1,000 or more beds or 40,000 or
 more discharges annually.  The remaining sample of hospitals was based on
 a stratified, three-stage design.  The first stage consisted of selection
 of 112 primary sampling units (PSU's) that comprised a probability
 subsample of PSU's used in the 1985-94 National Health Interview Survey.
 The second stage consisted of selection of non-certainty hospitals from
 the sample PSU's.  At the third stage a sample of discharges was selected
 by a systematic random sampling technique.

 These changes in the survey may affect trend data; that is, some of the
 differences between NHDS statistics based on the 1965-87 sample and
 statistics based on the sample drawn for the new design may be due to
 sampling error rather than changes in hospital utilization.

 For 1991, the NHDS sampling frame consists of eligible hospitals which
 began accepting inpatients before September 1, 1987, and were listed in
 the April 1987 SMG Hospital Market Data Tape (SMG Marketing Group, Inc.
 1989).

 Two data collection procedures were used for the survey.  The first was a
 manual system of sample selection and data abstraction, used for
 approximately 67 percent of the responding hospitals.   The second was an
 automated method, used for approximately 33 percent of the respondent
 hospitals, that involved the purchase of computerized data tapes from
 abstracting service organizations, state data systems, or from the
 hospitals themselves.

 In the manual system, the sample selection and the transcription of
 information from the hospital records to abstract forms were performed at
 the hospitals.  Of the hospitals using this system in 1991, about two-
 thirds had the work performed by their own medical records staff.  In the
 remaining hospitals using the manual system, personnel of the U.S. Bureau
 of the Census did the work on behalf of NCHS.  The completed forms, along
 with sample selection control sheets, were forwarded to NCHS for coding,
 editing, and weighting.

 For the automated system, NCHS purchased tapes containing machine-readable
 medical record data from which records were systematically sampled by
 NCHS.

 The Medical Abstract Form (Figure 1) and the automated data contain items
 relating to the personal characteristics of the patient, including birth
 date or age, sex, race, and marital status, but not name and address;
 administrative information, including admission and discharge dates,
 discharge status, and medical record number; and medical information,
 including diagnoses and surgical and nonsurgical procedures.  Since 1977,
 patient zip code, expected source of payment, and dates of surgery have
 also been collected.  (The medical record number, date of birth, and
 patient zip code are confidential information and are not available to the
 public.)

 Medical Coding and Edit

 The medical information that was recorded manually on the sample patient
 abstracts was coded centrally by NCHS staff.  A maximum of seven
 diagnostic codes was assigned for each sample abstract; in addition, if
 the medical information included surgical or nonsurgical procedures, a
 maximum of four codes for these procedures was assigned.  The system
 currently used for coding the diagnoses and procedures on the medical
 abstract forms as well as on the commercial abstracting services data
 tapes is the International Classification of Diseases, 9th Revision,
 Clinical Modification, or ICD-9-CM (3).  All of the diagnostic and
 procedure codes in the ICD-9-CM are utilized.

 NHDS usually presents diagnoses and procedures in the order they are
 listed on the abstract form or obtained from abstract services, however,
 there are exceptions.  For women discharged after a delivery, a code of
 V27 from the supplemental classification is entered as the second-listed
 code, with a code designating either normal or abnormal delivery in the
 first-listed position.  In another exception, a decision was made to
 reorder some acute myocardial infarction diagnoses.  If an acute
 myocardial infarction is listed with other circulatory diagnoses and is
 other than the first entry, it is reordered to first position.  If a
 symptom appears as a first-listed code and a diagnosis appears as a
 secondary code, the diagnosis replaces the symptom which is moved back.

 Following conversion of the data on the medical abstract to computer tape
 and combining it with the automated data tapes, a final medical edit was
 accomplished by computer inspection and by a manual review of rejected
 records.  Priority was given to medical information in the editing
 decision.

 Users of the National Hospital Discharge Survey (NHDS) diagnostic and/or
 procedure data, which is coded to the ICD-9-CM, must take into account
 annual ICD-9-CM addenda.  The addenda lists new codes, new fourth or fifth
 digits to existing codes, as well as other modifications.  A list of the
 changes for October 1986, October 1987, October 1988, October 1989,
 October 1990, and October 1991 are listed in Appendix B.

 The Uniform Hospital Discharge Data Set (UHDDS) --Starting with 1979 data,
 the NHDS has followed guidelines of the Uniform Hospital Discharge Data
 Set (UHDDS) within the confines of its contractual agreement with
 participating hospitals.  The UHDDS is a minimum data set of items
 uniformly defined (4).  These items were selected on the basis of their
 usefulness to a broad range of organizations and agencies requiring
 hospital information, uniformity of definition, and general availability
 from medical records and abstract services.

 Population Estimates.--Appendix C shows population estimates provided by
 the U.S. Bureau of the Census.  The estimates are of the U.S. civilian
 resident population on July l of the data year.  These population
 estimates are consistent with those published in Current Population
 Reports, Series P-25; however, these tables are not official population
 estimates of the Bureau of the Census.

 Measurement Errors.--As in any survey, results are subject to nonsampling
 or measurement errors, which include errors due to hospital nonresponse,
 missing abstracts, information incompletely or inaccurately recorded on
 abstract forms, and processing errors.  Approximately one percent of
 the discharge records failed to include age or sex of patient or date of
 admission or discharge.  If the hospital record did not state age or sex
 of patient, it was imputed by assigning the patient an age or sex
 consistent with the age or sex of other sampled patients with the same
 diagnostic code.  If the dates of admission or discharge were not given,
 and if they could not be obtained from the monthly sample listing sheet
 transmitted by the sample hospital, a length of stay was imputed by
 assigning the patient a stay characteristic of the stays of other patients
 of the same age.  Other edit and imputation procedures may have been
 applied to data in the NHDS collected in automated form.

 Sampling errors and rounding of numbers.--The standard error is primarily
 a measure of sampling variability that occurs by chance because only a
 sample rather than the entire universe is surveyed.  The relative standard
 error of the estimate is obtained by dividing the standard error by the
 estimate itself.  The resulting value is multiplied by 100, so the
 relative standard error is expressed as a percent of the estimate.
 Estimates of sampling variability were calculated with SESUDAAN software,
 which computes standard errors by using a first-order Taylor series
 approximation of the deviation of estimates from their expected values.  A
 description of the software and the approach it uses was published by Shah
 (5).

 Relative Standard Errors for Aggregate Estimates

 Approximate relative standard errors for aggregate estimates are presented
 in Table 1.  To derive error estimates that would be applicable to a wide
 variety of statistics, numerous variances were calculated and a best fit
 formula was produced.  The curves were based on an empirically determined
 relationship between the size of an estimate X and its relative variance.
 The relative standard error is then derived by taking the square root of
 the relative variance.  The relative standard error of an estimate X
 {RSE(X)}, expressed as a percent, may be calculated from the formula:

               RSE(X) = 100  sqrt( a + b/X)

 with a and b provided in Table 1.

 For example, in 1991 the estimated number of discharges from short-stay
 hospitals for females with a first-listed diagnosis of atherosclerotic
 heart disease (ICD-9-CM code 414.0) was 121,000.  Using the applicable
 constants from Table 1 for estimates by sex produces:

          RSE(121,000) = 100 sqrt( .00099 + (442.186 / 121,000))

          RSE(121,000) = 6.82%

 The relative standard error for the estimate of interest is 6.82 percent.
 From this the standard error is obtained by multiplying the relative
 standard error by the estimate:

          S(121,000) =  121,000 * 6.82% = 8,246

 The standard error can be employed to generate confidence intervals for
 statistical testing.  In this example, the 68% confidence interval for the
 estimate of female inpatients with a first-listed diagnosis of
 atherosclerotic heart disease is:

                 (121,000 - 8,246) <-> (121,000 + 8,246)

                          112,754  <->  129,246

Relative Standard Error for Estimates of Percents
 
 Approximate relative standard errors for estimates of percents may be
 calculated from Table 1 also.  The relative standard error for a percent,
 100 p (0<p<1), (expressed as a percent), may be calculated using the
 formula:

               RSE(p) = 100 sqrt( b*(1 - p)/(p*X))

 where 100 p is the percent of interest, X is the base of the percent, and
 b is the parameter b in the formula for approximating the RSE(X).  The
 values for b are given in Table 1.

 For example, in 1991 the estimated number of discharges from short-stay
 hospitals which were female was 18,620,000.  This is 59.9 percent of the
 estimated 31,098,000 discharges for that year.  Using the applicable
 constants from Table 1 for estimates by sex produces:

          RSE(.599) = 100 sqrt(442.186 * (1 - .599) / (.599 * 31,098,000))

          RSE(.599) = 0.309%

 The relative standard error for the estimate of interest is 0.309 percent.
 From this the standard error is obtained by multiplying the relative
 standard error by the estimate:

          S(.599) = .599 * 0.309% = 0.00185.

 The standard error can be employed to generate confidence intervals for
 statistical testing.  In this example, the 68% confidence interval for the
 estimate of the percentage of female inpatients is:

                   (.599 - 0.00185) <-> (.599 + 0.00185)

                            .5972   <->  .6008

 or, equivalently,            59.7%  <->   60.1%

Table 1 First-Listed Diagnoses or Number
 Parameter values for relative standard errors 1/ for National
 Hospital Discharge Survey aggregate statistics by statistic type:  United
 States, 1991


                  FIRST-LISTED DIAGNOSES OR NUMBER OF DISCHARGES

                         Constant a     Constant b

 Overall                   0.00101        546.321

 Sex
   Male                    0.00447        213.042
   Female                  0.00099        442.186

 Race
   White                   0.00234        927.094
   Black                   0.00569        273.368
   All other               0.02889        280.075
   Not stated              0.01666        427.619

 Age
   Under 15 years          0.01786         65.842
   15-44 years             0.00956        111.147
   45-64 years             0.01292         44.094
   65 years and over       0.01149         25.788

 Region
   Northeast               0.00293        243.156
   Midwest                 0.00603        331.780
   South                   0.00247        547.686
   West                    0.00513        403.340

 Source of Payment
   Worker's compensation   0.00250        588.807
   Medicare                0.00548        883.428
   Medicaid                0.00348       1979.378
   Not stated              0.04490        639.387
   Other Government        0.08079        177.390
   Private                 0.00148        780.110
   Self                    0.00244        662.998
   No charge/other         0.02235        407.608

Table 2 All-Listed Diagnoses
                               ALL-LISTED DIAGNOSES

                         Constant a     Constant b

 Overall                   0.00112        589.046

 Sex
   Male                    0.00340        256.740
   Female                  0.00114        404.633

 Race
   White                   0.00237        777.966
   Black                   0.00621        283.703
   All other               0.03698        356.210
   Not stated              0.01895        793.131

 Age
   Under 15 years          0.01788         74.015
   15-44 years             0.00395        228.512
   45-64 years             0.01283         43.455
   65 years and over       0.01324         26.710

 Region
   Northeast               0.00688        684.720
   Midwest                 0.00629        422.099
   South                   0.00289        631.339
   West                    0.00394        426.981

 Source of Payment
   Worker's compensation   0.00313       1639.248
   Medicare                0.00353       3623.733
   Medicaid                0.00187       6418.479
   Not stated              0.05308       1864.231
   Other Government        0.07414        836.713
   Private                 0.00137       4173.164
   Self                    0.00196       3122.322
   No charge/other         0.02406       1297.668

Table 3 Number of All-Listed Procedures
                          NUMBER OF ALL-LISTED PROCEDURES

                         Constant a     Constant b

 Overall                   0.00153        427.265

  Sex
   Male                    0.00568        139.827
   Female                  0.00164        342.466

 Race
   White                   0.00298        371.348
   Black                   0.01000        356.748
   All other               0.03328        191.506
   Not stated              0.02247        228.166

 Age
   Under 15 years          0.03313         53.065
   15-44 years             0.00986         87.726
   45-64 years             0.01182        125.847
   65 years and over       0.01629         12.837

 Region
   Northeast               0.00746        181.945
   Midwest                 0.00781        333.914
   South                   0.00298        468.737
   West                    0.00753        251.058

 Source of Payment
   Worker's compensation  -0.00116       2181.297
   Medicare                0.02736        232.797
   Medicaid                0.00649       3457.633
   Not stated              0.07787        548.170
   Other Government        0.09720        319.395
   Private                 0.00179       2525.008
   Self                    0.00351       1511.651
   No charge/other         0.07391       1138.992

Table 4 Number of Days of Care
                               NUMBER OF DAYS OF CARE

                         Constant a     Constant b


 Overall                   0.00173       2343.213

 Sex
   Male                    0.00518       5120.963
   Female                  0.00194       1634.957

 Race
   White                   0.00360       2087.655
   Black                   0.00926       1034.092
   All other               0.04980        253.439
   Not stated              0.02339        966.802

 Age
   Under 15 years          0.07618        737.582
   15-44 years             0.02384        475.352
   45-64 years             0.02949         92.219
   65 years and over       0.01849         25.558

 Region
   Northeast               0.00451       1967.234
   Midwest                 0.01037        608.558
   South                   0.00400       1435.185
   West                    0.00891        871.769

 Source of Payment
   Worker's compensation   0.00393      12444.000
   Medicare                0.00456       6548.842
   Medicaid                0.00136      18545.000
   Not stated              0.05367       3639.382
   Other Government        0.04261        988.154
   Private                 0.00169      12606.000
   Self                    0.00399       5923.664
   No charge/other         0.02240       2779.271
 Presentation of Estimates.--Publication of estimates for the NHDS is based
 on the relative standard error of the estimate and the number of sample
 records on which the estimate is based (referred to as the sample size).
 Estimates are not presented in NCHS reports unless a reasonable assumption
 regarding the probability distribution of the sampling error is possible.

 Based on consideration of the complex sample design of the NHDS, the
 following guidelines are used for presenting the NHDS estimates:

   If the sample size is less than 30, the value of the estimate is not
   reported.

   If the sample size is 30-59, the value of the estimate is reported but
   should not be assumed reliable.

   If the sample size is 60 or more and the relative standard error is
   less than 30 percent, the estimate is reported.

   If the sample size is 60 or more but the relative standard error is
   over 30 percent, the estimate is reported but should not be assumed
   reliable.

 How to Use the Data Tape.--The NHDS records are weighted to allow
 inflation to national or regional estimates.  The weight applied to each
 record is found in tape location 111-115.  To produce an estimate of the
 number of discharges, the weights for the desired records must be summed.
 To produce an estimate for number of days of care, the weight must be
 multiplied by the length of stay (tape location 101-104) and these
 products are summed.  Length of stay data can be obtained by using recodes
 already on the tape (see items 14 and 18 in the tape layout), or by
 dividing days of care by number of discharges as calculated above.

 Appendix D contains unweighted and weighted frequencies for selected
 descriptive variables on the data tape.  These may be used as a cross-
 check when processing the data on the user's system.

Monthly and Seasonal Estimates Under the New Design

 An important difference between the old and new designs is the method used
 to adjust for nonresponse.  In the old design, weights for responding
 hospitals were adjusted each month to account for hospitals that did not
 respond for that month.  In the new design, the type of nonresponse
 adjustment applied depended on whether the hospital was considered a
 nonrespondent or partial respondent.  A nonresponding hospital was one
 which failed to provide at least half of the expected number of discharges
 for at least half of the months for which it was inscope.  In this case,
 weights of discharges from hospitals similar to the nonresponding hospital
 were inflated to account for discharges of the nonrespondent hospital.
 However, this adjustment was performed just once, after the close out of
 the survey for the year, instead of monthly as before.

 For partially responding hospitals, one or both of two adjustments were
 made.  If the hospital provided at least half, but not all, of the
 expected number of abstracts for a given month, the weights of the
 abstracts actually collected for that month were inflated to account for
 the missing abstracts.  If fewer than half of the expected number of
 abstracts were provided, the weights of the abstracts provided were
 inflated by a factor of two, then another adjustment was made to account
 for the excess nonresponse.  In the second adjustment, the weights of the
 discharges in the hospital's respondent months were inflated by ratios
 that varied by category of first-listed ICD-9-CM diagnostic code.  This
 adjustment ratio was based on the hospital's month(s) of nonresponse and
 the month-by-month distributions of first-listed diagnostic groups among
 discharges from hospitals which responded for all twelve months.  The
 ratio accounts for the seasonality in the occurrence of the first-listed
 diagnostic groups for annual statistics, but not for partial year
 estimates.  As a result monthly and seasonal estimates may be skewed.
 While the effect is believed to be small, it is recommended that partial
 year estimates NOT be produced.  In the 1991 NHDS, 90 percent of the 484
 responding hospitals provided data for all twelve months, and 94 percent
 provided at least 9 months of data.

 Diagnosis-Related Groups (DRGs).--Many users of the NHDS data tapes have
 expressed an interest in converting the data to DRGs.  This has been done
 using DRG Grouper Programs obtained from the Health Care Financing
 Administration.  The DRGs and the DRG Grouper Programs were developed
 outside of the National Center for Health Statistics; any questions about
 DRGs, other than specific questions about how they relate to NHDS data,
 should be addressed elsewhere.

 Questions.--Questions concerning data on the tape should be directed to
 Maria Owings, Ph.D., Hospital Care Statistics Branch, Division of Health
 Care Statistics, National Center for Health Statistics, Presidential
 Building, Room 956, 6525 Belcrest Road, Hyattsville, Maryland  20782,
 (301)-436-7125.

REFERENCES

 1National Center for Health Statistics:  Development of the design of the
 NCHS Hospital Discharge Survey, by W. R. Simmons.  Vital and Health
 Statistics.  PHS Pub. No. 1000, Series 2-No. 39.  Public Health Service.
 Washington.  U.S. Government Printing Office, Sept. 1970.

 2SMG Hospital Marketing Group, Inc. 1989. Hospital Market Database.
 Healthcare Information Specialists, 1342 North LaSalle Drive, Chicago,
 Illinois.

 3National Center for Health Statistics:  International Classification of
 Diseases, 9th Revision, Clinical Modification.  DHHS Pub. No. (PHS) 80-
 1260.  Public Health Service.  Washington.  U.S. Government Printing
 Office, Sept. 1980.

 4Office of the Secretary, Department of Health and Human Services:  Health
 Information Policy Council: 1984 Revision of the Uniform Hospital
 Discharge Data Set.  Federal Register, Volume 50, No. 147. July 31, 1985.

 5Shah, B.V. 1981.  SESUDAAN:  Standard Errors Program for Computing of
 Standardized Rates from Sample Survey Data.  Research Triangle Institute.
 Research Triangle Park, N.C.

RECORD LAYOUT
 This section provides detailed information for each sampled record on the
 tape, with a description of each item included in the record. Data
 elements are arranged sequentially according to their physical location on
 the tape record.  Unless otherwise stated in the Item Description, the
 data are derived from the abstract form or from automated sources.  The
 SMG Hospital Market Tape and the hospital interview are alternate sources
 of data; some other items are computer generated.


 Item          Tape     Number of
 Number       Location   Positions       Item Description and Codes


                           1-2     2              Blank

        1        3            1 Discharge Status Recode

                            1: Alive
                            2: Dead
                            3: Not Stated

                           4-29    26             Blank

        2        30-33        4 Age

                                  Units             Number
                              (Location 33)    (Location 30-32)

                            1: Years           001-124
                            2: Months          001-011
                            3: Days            000-031

        3        34           1 Sex

                            1: Male
                            2: Female

                35            1 Blank

        4       36           1 Marital Status

                            1: Married
                            2: Single
                            3: Widowed
                            4: Divorced
                            5: Separated
                            6: Not Stated
                            7: Unknown

  5          37-41        5      Date of Admission

       5.1   37-38         2 Month of Admission

                            01: January through
                            12: December

       5.2   39-40         2 Day of Admission

                            01-31

       5.3      41       1 Year of Admission

                            0: 1990
                            1: 1991

    6        42-46        5 Date of Discharge

       6.1   42-43       2   Month of Discharge

                            01: January through
                            12: December

       6.2   44-45       2   Day of Discharge

                            01-31

     6.3      46              1 Year of Discharge

                            1: 1991
                            2:  1992

  7           47         1      Discharge Status

                            1: Routine Discharge/Discharged Home
                            2: Left Against Medical Advice
                            3: Discharged/Transferred to Another
                               Short-Term Hospital
                            4: Discharged/Transferred to Long-Term
                               Care Institution
                            5: Alive, Disposition Not Stated
                            6: Dead
                            7: Status Not Stated

              48           1 Blank

  8           49           1      Age Recode

                            1: Less than 15 Years
                            2: 15-44 Years
                            3: 45-64 Years
                            4: 65 Years and Over

   9          50           1 Number of Diagnostic Codes Recorded

                            1 - Minimum
                            7 - Maximum

  10           51           1      Number of Surgical Codes Recorded

                            0 - Minimum
                            4 - Maximum

  11         52-56        5      Date of Surgery #3

    11.1     52-53      2   Month of Surgery

                            01-12

    11.2     54-55         2   Day of Surgery

                            01-31

    11.3       56         1      Year of Surgery

                            0: 1990
                            1: 1991
                             2:  1992

  12         57-61     5             Date of Surgery #4

                            Same format as above (52-56)

             62-77        16 Blank

  13         78-81         4 Length of Stay in Days

                            This item was generated by the computer
                            on the basis of date of admission and
                            date of discharge.

  14         82-83       2      Length of Stay Recode #1 (Computer
                            Generated)

                            00: 00 Days
                            01: 01 Days
                             .      .
                             .      .
                             .      .
                            31: 31 Days and Over


  15         84-85         2 Age Recode (Computer Generated)

                            00: Newborn
                            01: Under 1 Year
                            02: 01-04 Years
                            03: 05-14 Years
                            04: 15-24 Years
                            05: 25-34 Years
                            06: 35-44 Years
                            07: 45-54 Years
                            08: 55-64 Years
                            09: 65-74 Years
                            10: 75 Years and Over

  16           86           1 Race

                            1: White
                            2: Black
                            3: American Indian/Eskimo/Aleut
                            4: Asian/Pacific Islander
                            5: Other
                            6: Not Stated

   17          87         1 Marital Status Recode (Computer Generated)

                            1: Married
                            2: Not Married
                            3: Not Stated

   18          88         1 Length of Stay Recode #2
                            (Computer Generated)

                            1: 00-07 Days
                            2: 08-14 Days
                            3: 15-21 Days
                            4: 22-28 Days
                            5: 29 Days and Over

             89-90      2 Blank

   19          91         1      Geographic Region

                            1: Northeast
                            2: Midwest
                            3: South
                            4: West

             92-98      7 Blank

   20         99         1      Number of Beds Recode (Interview)

                            1: 6-99 Beds
                            2: 100-199 Beds
                            3: 200-299 Beds
                            4: 300-499 Beds
                            5: 500 Beds or more

   21         100     1      Hospital Ownership (Interview)

                            1: Proprietary
                            2: Government
                            3: Not for profit

   22       101-104      4      Length of Stay in Days

                            Data in 78-81 has been transferred to
                            this data field with 0000 days recoded
                            to 0001.

            105-110      6      Blank

  23        111-115      5 Weight

                            Final Adjusted Weight (whole number)
                            (see pg. 13 How to Use Tape)

            116-130     15      Blank

  24        131-136      6      Expected Source(s) of Payment

   24.1      131              1 Principal
   24.2      132              1 Other
   24.3      133              1 Other
   24.4      134              1 Other
   24.5      135              1 Other
   24.6      136              1 Other

                            Code  Source of Payment

                            l: Worker's Compensation
                            2: Medicare
                            3: Medicaid
                            4: Not Stated
                            5: Other Government Payment
                            6: Blue Cross
                            7: Other Private/Commercial Insurance
                            8: Self-Pay
                            9: No Charge
                            0: Other

   25        137-141               5   Date of Surgery #1

                            Same format as above (52-56)

   26        142-146      5 Date of Surgery #2

                            Same format as above (52-56)

             147-148     2  Blank

   27        149-183     35 Diagnostic Codes** (Five-Digit Codes)

   27.1  149-153              5   Diagnosis No. 1
   27.2  154-158              5   Diagnosis No. 2
   27.3  159-163              5   Diagnosis No. 3
   27.4  164-168              5   Diagnosis No. 4
   27.5  169-173              5   Diagnosis No. 5
   27.6  174-178              5   Diagnosis No. 6
   27.7  179-183              5   Diagnosis No. 7

  28        184-199     16 Surgical Codes** (Four-Digit Codes)

   28.1  184-187              4   Surgery No. 1
   28.2  188-191              4   Surgery No. 2
   28.3  192-195              4   Surgery No. 3
   28.4  196-199              4   Surgery No. 4

             200           1 Blank

  29        201-203      3        DRGs -- Grouper Version 8.0




 ***************************************************************
 If you have any suggestions about how to better provide NHDS
 data by DRGs to NHDS data users, please write to Maria Owings,
 NCHS, Room 956, 6525 Belcrest Road, Hyattsville, MD  20782.
 Your assistance is greatly appreciated.
 ***************************************************************



 __________________________________________________________________________
 **Codes are in compliance with the ICD-9-CM.  There is an implied decimal
 between positions 3 and 4 for each diagnostic code, (with the exception of
 E-codes, where the implied decimal is between 4 and 5) and between
 positions 2 and 3 for each surgical code.

APPENDIX A
 Definition of Terms
 Terms relating to hospitals and hospitalization

 Hospitals-Short-stay hospitals or hospitals whose specialty is general
 (medical or surgical), or children's general.  Hospitals must have 6 beds
 or more staffed for patients use.  Federal hospitals and hospital units of
 institutions are not included.

 Type of ownership of hospital-The type of organization that controls and
 operates the hospital.  Hospitals are grouped as follows:

   Not for Profit-Hospitals operated by a church or another not for profit
   organization.

   Government-Hospitals operated by State and local government.

   Proprietary-Hospitals operated by individuals, partnerships, or
   corporations for profit.

 Patient-A person who is formally admitted to the inpatient service of a
 short-stay hospital for observation, care, diagnosis, or treatment, or by
 birth.

 Discharge-The formal release of a patient by a hospital; that is, the
 termination of a period of hospitalization by death or by disposition to
 place of residence, nursing home, or another hospital.  The terms
 "discharges" and "patients discharged" are used synonymously.

 Discharge rate-The ratio of the number of hospital discharges during the
 year to the number of persons in the civilian population on July 1 of that
 year.

 Days of care-The total number of patient days accumulated at time of
 discharge by patients discharged from short-stay hospitals during a year.
 A stay of less than 1 day (patient admission and discharge on the same
 day) is counted as 1 day in the summation of total days of care.  For
 patients admitted and discharged on different days, the number of days of
 care is computed by counting all days from (and including) the date of
 admission to (but not including) the date of discharge.

 Rate of days of care-The ratio of the number of patient days accumulated
 at time of discharge to the number of persons in the civilian population
 on July 1 of that year.

 Average length of stay-The total number of days of care accumulated at
 time of discharge by patients discharged during the year, divided by the
 number of patients discharged.

Terms relating to diagnoses and procedures

 Discharge diagnoses-One or more diseases or injuries (or some factor that
 influences health status and contact with health services that is not
 itself a current illness or injury) listed by the attending physician on
 the medical record of a patient.  In the NHDS, discharge (or final)
 diagnoses listed on the face sheet (summary sheet) of the medical record
 are transcribed in the order listed.  Each sample discharge is assigned a
 maximum of seven five-digit codes according to ICD-9-CM (2).

 Principal diagnosis-The condition established after study to be chiefly
 responsible for occasioning the admission of the patient to the hospital
 for care.

 First-listed diagnosis-The coded diagnosis identified as the principal
 diagnosis or listed first on the face sheet of the medical record if the
 principal diagnosis cannot be identified. The number of first-listed
 diagnoses is equivalent to the number of discharges

 Procedure-One or more surgical or nonsurgical operations, procedures, or
 special treatments listed by the physician on the medical record.  In the
 NHDS, all terms listed on the face sheet (summary sheet) of the medical
 record under the caption "operation," "operative procedures," "operations
 and/or special treatment," and the like are transcribed in the order
 listed.  A maximum of four procedures are coded.

 Rate of procedures-The ratio of the number of all-listed procedures during
 a year to the number of persons in the civilian population on July 1 of
 that year determines the rate of procedures.

Demographic terms

 Age-Refers to the age of the patient on the birthday prior to admission to
 the hospital inpatient service.

 Population-Civilian population is the resident population excluding
 members of the Armed Forces.

 Geographic regions-Hospitals are classified by location in one of the four
 geographic regions of the United States corresponding to those used by the
 U.S. Bureau of the Census:

Geographic Region States included

 Northeast......  Maine, New Hampshire, Vermont
                  Massachusetts, Rhode Island,
                  Connecticut, New York, New Jersey,
                  and Pennsylvania

 Midwest.......   Michigan, Ohio, Illinois, Indiana,
                  Wisconsin, Minnesota, Iowa,
                  Missouri, North Dakota,
                  South Dakota, Nebraska,
                  and Kansas

 South.........   Delaware, Maryland, District of
                  Columbia, Virginia, West Virginia,
                  North Carolina, South Carolina, Georgia,
                  Florida, Kentucky, Tennessee, Alabama,
                  Mississippi, Arkansas, Louisiana,
                  Oklahoma, and Texas

 West..........   Montana, Idaho, Wyoming,
                  Colorado, New Mexico, Arizona,
                  Utah, Nevada, Washington, Oregon,
                  California, Hawaii, and Alaska

APPENDIX B
 Introduction
    Although the International Classification of Diseases, 9th  Revision,
 Clinical Modification has been used for coding NHDS data since 1979, the
 classification undergoes annual updating.  Assignment of new diagnostic
 and procedure codes, fourth and fifth digit expansion of codes, as well as
 code deletions, are contained in addenda developed by the ICD-9-CM
 Coordination and Maintenance Committee and approved by the Director of
 NCHS and the Administrator of the Health Care Financing Administration.
 Addenda to the ICD-9-CM become effective October 1 of the affected year
 and have been released for 1986, 1987, 1988, 1989, 1990, and 1991.

    As described earlier, the 1991 NHDS involved two data collection modes:
 manual and abstract.  All data collected manually were coded using the
 third edition of the ICD-9-CM, which includes the addenda for 1986, 1987,
 1988, 1989, 1990, and 1991.  Data collected via abstract service were
 coded using two different ICD-9-CM revisions.  For the first 9 months of
 1991, the ICD-9-CM including the addenda of October 1, 1986-90 was used.
 Therefore, the reader is cautioned that annual estimates for new ICD-9-CM
 codes may be underestimated for 1991 and that it is necessary to note both
 the old and new descriptions for codes that were changed.

   In order to assist users in data retrieval, a conversion table is
 provided that shows for each new code, its date of introduction  and the
 previously assigned code eguivalent, which had been used  for reporting
 the selected diagnosis or procedure prior to  issuance of the new code.

Diagnosis Codes

 Current Code(s)              Effective             Previous Code(s)
   Assignment                 October 1               Assignment

 042.0-042.9                   1986                      279.19
 043.0-043.9                   1986                      279.19
 044.0-044.9                   1986                      279.19

 070.20-070.21                 1991                      070.2
 070.30-070.31                 1991                      070.3
 070.41-070.49                 1991                      070.4
 070.51-070.59                 1991                      070.5

 088.81, 088.89                1989                      088.8

 176.0-176.9                   1991                      173.0-173.9

 203.00                        1991                      203.0
 203.01                        1991                      V10.79
 203.10                        1991                      203.1
 203.11                        1991                      V10.79
 203.80                        1991                      203.8
 203.81                        1991                      V10.79
 204.00                        1991                      204.0
 204.01                        1991                      V10.61
 204.10                        1991                      204.1
 204.11                        1991                      V10.61
 204.20                        1991                      204.2
 204.21                        1991                      V10.61
 204.80                        1991                      204.8
 204.81                        1991                      V10.61
 204.90                        1991                      204.9
 204.91                        1991                      V10.61

 205.00                        1991                      205.0
 205.01                        1991                      V10.62
 205.10                        1991                      205.1
 205.11                        1991                      V10.62
 205.20                        1991                      205.2
 205.21                        1991                      V10.62
 205.30                        1991                      205.3
 205.31                        1991                      V10.62
 205.80                        1991                      205.8
 205.81                        1991                      V10.62
 205.90                        1991                      205.9
 205.91                        1991                      V10.62

 206.00                        1991                      206.0
 206.01                        1991                      V10.63
 206.10                        1991                      206.1
 206.11                        1991                      V10.63
 206.20                        1991                      206.2
 206.21                        1991                      V10.63
 206.80                        1991                      206.8
 206.81                        1991                      V10.63
 206.90                        1991                      206.9
 206.91                        1991                      V10.63

 207.00                        1991                      207.0
 207.01                        1991                      V10.69
 207.10                        1991                      207.1
 207.11                        1991                      V10.69
 207.20                        1991                      207.2
 207.21                        1991                      V10.69
 207.80                        1991                      207.8
 207.81                        1991                      V10.69

 208.00                        1991                      208.0
 208.01                        1991                      V10.60
 208.10                        1991                      208.1
 208.11                        1991                      V10.60
 208.20                        1991                      208.2
 208.21                        1991                      V10.60
 208.80                        1991                      208.8
 208.81                        1991                      V10.60
 208.90                        1991                      208.9
 208.91                        1991                      V10.60
 237.70-237.72                 1990                      237.7

 345.00-345.01                 1989                      345.0
 345.10-345.11                 1989                      345.1
 345.40-345.41                 1989                      345.4
 345.50-345.51                 1989                      345.5
 345.60-345.61                 1989                      345.6
 345.70-345.71                 1989                      345.7
 345.80-345.81                 1989                      345.8
 345.90-345.91                 1989                      345.9
 374.87                        1990                      374.89

 403.00-403.01                 1989                      403.0
 403.10-403.11                 1989                      403.1
 403.90-403.91                 1989                      403.9

 404.00-404.03                 1989                      404.0
 404.10-404.13                 1989                      404.1
 404.90-404.93                 1989                      404.9

 410.00-410.02                 1989                      410.0
 410.10-410.12                 1989                      410.1
 410.20-410.22                 1989                      410.2
 410.30-410.32                 1989                      410.3
 410.40-410.42                 1989                      410.4
 410.50-410.52                 1989                      410.5
 410.60-410.62                 1989                      410.6
 410.70-410.72                 1989                      410.7
 410.80-410.82                 1989                      410.8
 410.90-410.92                 1989                      410.9

 411.81                        1989                      410.9
 411.89                        1989                      411.8

 429.71                        1989                   410.0-410.9
 429.79                        1989                   410.0-410.9

 446.20-446.21,446.29          1990                      446.2

 491.20-491.21                 1991                      491.2
 493.20                        1989                      493.90
 493.21                        1989                      493.91

 518.81                        1987                      799.1
 518.82-518.89                 1987                      518.8

 524.60-524.69                 1991                      524.6

 535.00-535.01                 1991                      535.0
 535.10-535.11                 1991                      535.1
 535.20-535.21                 1991                      535.2
 535.30-535.31                 1991                      535.3
 535.40-535.41                 1991                      535.4
 535.50-535.51                 1991                      535.5
 535.60-535.61                 1991                      535.6

 537.82                        1990                      537.89
 537.83                        1991                      537.82

 562.02                        1991                      562.00
 562.03                        1991                      562.01
 562.12                        1991                      562.10
 562.13                        1991                      562.11

 569.84                        1990                      557.1
 569.85                        1991                      569.84

 645.0                         1991                      645

 651.30-651.31,651.33          1989            651.00-651.01,651.03
 651.40-651.41,651.43          1989            651.10-651.11,651.13
 651.50-651.51,651.53          1989            651.20-651.21,651.23
 651.60-651.61,651.63          1989            651.80-651.81,651.83


 654.20-654.21,654.23          1990                     654.2,654.9
 654.90-651.94                 1990                     654.2,654.9

 657.0                         1991                      657

 670.0                         1991                      670
 672.0                         1991                      672

 702.0-702.8                   1991                      702

 753.10-753.17,753.19          1990                      753.1
 759.81-759.89                 1989                      759.8
 760.75                        1991                      760.79

 764.00-764.09                 1988                      764.0
 764.10-764.19                 1988                      764.1
 764.20-764.29                 1988                      764.2
 764.90-764.99                 1988                      764.9

 765.00-765.09                 1988                      765.0
 765.10-765.19                 1988                      765.1

 795.8                         1986                      795.7

 996.51-996.59                 1987                      996.5
 996.60-996.69                 1989                      996.6
 996.70-996.79                 1989                      996.7
 996.80-996.89                 1987                      996.8

 996.85                        1990                      999.8

 V30.00-V30.01                 1989                      V30.0
 V31.00-V31.01                 1989                      V31.0
 V32.00-V32.01                 1989                      V32.0
 V33.00-V33.01                 1989                      V33.0
 V34.00-V34.01                 1989                      V34.0
 V35.00-V35.01                 1989                      V35.0
 V36.00-V36:01                 1989                      V36.0
 V37.00-V37.01                 1989                      V37.0
 V39.00-V39.0l                 1989                      V39.0

Procedure Codes

 Current Code(s)              Effective             Previous Code(s)
 Assignment                   October 1                 Assignment

 03.90                         1987                         03.99
                                         (Insertion of Catheter)

 11.75                         1989                         11.79
 11.76                         1989                         11.62

 20.96-20.98                   1986                         20.95

 22.12                         1988                         22.11

 26.12                         1988                         26.11

 29.31                         1991                         83.02
 29.32                         1991                         29.3
 29.33                         1991                         29.3
 29.39                         1991                         29.3

 31.45                         1988                   31.43-31.44

 31.95                         1989                         31.75

 32.01                         1989                         32.0
 32.09                         1989                         32.0

 32.28                         1989                         32.29

 33.27                         1987                   33.22 + 33.27
 33.28                         1987                         33.27
 33.29                         1987                     33.28-33.29

 33.6                          1990                    33.5 + 37.5

 35.84                         1988                         35.82

 35.96                         1986                         35.03

 36.00-36.03                   1986                         36.0
 36.04                         1986                         39.97
 36.05                         1987                         36.01
 36.05                         1986                  36.01*,36.02
 36.09                         1991           36.00 (Code Deleted)
 36.09                         1986                         36.0

  *Before October 1986 contents of current code 36.05 would have
  been assigned to 36.0.
 37.26-37.27                   1988                         37.29

 37.34                         1988                         37.33

 37.70        (Leads Only)     1987  (Leads/Device)         37.70
 37.71-37.72  (Leads Only)     1987  (Leads/Device)         37.74
 37.73        (Leads Only)     1987  (Leads/Device)         37.73
 37.74        (Leads Only)     1987  (Leads/Device)         37.76
 37.75        (Leads Only)     1987  (Leads/Device)         37.89
 37.76        (Leads Only)     1987  (Leads/Device)         37.81
 37.77        (Leads Only)     1987  (Leads/Device)   37.83-37.84

 37.78                         1987                   37.71-37.72
 37.79                         1987                         86.09

 37.80   (Device only)         1987  (Leads/Device)   37.73-37.77
 37.81   (Device only)         1987  (Leads/Device)   37.73-37.77
 37.82   (Device only)         1987  (Leads/Device)   37.73-37.77
 37.83   (Device only)         1987  (Leads/Device)   37.73-37.77
 37.85-37.87                   1987                         37.85
 37.89                         1987                   37.86+37.89

 37.94-37.98                   1986                         37.99

 38.22                         1986                         38.29

 38.44  (Abdominal Aorta Only) 1986          38.44 (Entire Aorta)
 38.45  (Thoracic Aorta Added) 1986                  38.44-38.45

 38.95                         1989                         38.93

 39.28                         1991                         39.29

 39.65                         1988                         39.61
 39.66                         1990                         39.65

 41.00-41.03                   1988                         41.0

 42.25                         1988                         42.24
 42.33                         1989                   42.32,42.39
 42.33                         1990                         42.91

 43.11                         1989                         43.1
 43.19                         1989                     43.1,43.2


 43.41                         1989                   43.41,43.49
 44.21                         1986                         44.2
 44.22                         1986                         44.99
 44.29                         1986                         44.2

 44.43                         1989                         43.49,
                                                            45.32

 44.44                         1989                         38.86
 44.49                         1989                         43.0

 44.93-44.94                   1986                         44.99

 45.16                         1988       45.14 (45.15 before 1987)

 45.30                         1989                     45.31,45.32

 45.42                         1988                         45.41
 45.43                         1989                         45.49

 45.75 (Hartmann Resection     1988            48.66 (Code Deleted)
          Added)

 45.95                         1987                         45.93

 46.32                         1989                         46.39

 46.85                         1989                         46.99


 49.31                         1989                         49.3
 49.39                         1989                         49.3

 51.10                         1989                         51.97
 51.11                         1989                   51.11,51.97
 51.14                         1989                         51.12
 51.15                         1989                         51.97

 51.22                         1991    51.21 (Code Deleted),51.22

 51.23                         1991                         51.22

 51.64                         1989                         51.69

 51.84-51.88                   1989                         51.97

 51.97                         1986         52.91,51.99, or 51.82
 51.98                         1986                         51.99
 52.13                         1989                   51.97,52.91
 52.14                         1989                         52.11
 52.21                         1989                         52.2
 52.22                         1989                         52.2

 52.93                         1989                 52.93 + 52.91
 52.94                         1989                         52.09
 52.97                         1989                         52.91
 52.98                         1989                         52.91
 52.99                         1989             52.93,52.94,52.99

 54.24                         1987                         54.23

 55.03-55.04                   1986                         55.02

 56.33-56.34                   1987                         56.33
 56.35                         1987                         45.12

 57.17-57.18                   1989                         57.21
 57.22                         1989                   57.22,57.82
 58.31                         1990                         58.3
 58.39                         1990                         58.3

 58.93                         1986                         57.99

 59.96                         1986                         59.95

 60.95                         1991                         60.99

 64.97                         1986                         64.95

 68.15                         1987                         68.14
 68.16                         1987                         68.13

 77.56                         1989             77.89,78.49,81.18
 77.57                         1989       77.89,80.48,81.18,83.85

 77.58                         1989                   77.59,81.18

 78.10                         1991                         78.40
 78.11                         1991                         78.41
 78.12                         1991                         78.42
 78.13                         1991                         78.43
 78.14                         1991                         78.44
 78.15                         1991                         78.45
 78.16                         1991                         78.46
 78.17                         1991                         78.47
 78.18                         1991                         78.48
 78.19                         1991                         78.49
 78.20                         1991               78.10,78.20,78.30
 78.21                         1991                   78.11,78.31
 78.22                         1991               78.12,78.22,78.32
 78.23                         1991               78.13,78.23,78.33
 78.24                         1991                   78.14,78.34
 78.25                         1991               78.15,78.25,78.35
 78.27                         1991               78.17,78.27,78.37
 78.28                         1991                   78.18,78.38
 78.29                         1991   78.11,78.16,78.19,78.29,78.39
 78.39                         1991                         78.31

 78.90*                        1987                         78.40
 78.91*                        1987                         78.41
 78.92*                        1987                         78.42
 78.93*                        1987                         78.43
 78.94*                        1987                         78.44
 78.95*                        1987                         78.45
 78.96*                        1987                         78.46
 78.97*                        1987                         78.47
 78.98*                        1987                         78.48
 78.99*                        1987                         78.49

 80.50-80.59                   1986                         80.5

 81.03                         1989                         81.02
 81.04-81.05                   1989             81.03,81.04,81.05

 81.06-81.07                   1989                   81.06,81.07
 81.08                         1989             81.06,81.07,81.08
 81.09                         1989                         81.08

 81.40                         1989                         81.69

 81.51                         1989                   81.51,81.59
 81.52                         1989       81.61,81.62,81.63,81.64
 81.53                         1989       81.51,81.59,81.61,81.62,
                                                      81.63,81.64



  *Codes 78.90-78.99 were retitled as "Insertion of bone growth
  stimulator" in October 1987; the previous contents of codes
  78.90-78.99 were reassigned to codes 78.40-78.49.

 81.54-81.55                   1989                         81.41
 81.56                         1989                         81.48
 81.57                         1989                   81.31,81.39
 81.59                         1989                         81.39

 81.72                         1989                         81.79
 81.73-81.74                   1989                         81.86
 81.75                         1989                         81.87
 81.79                         1989                   81.79,81.87
 81.80                         1989                         81.81

 85.95                         1987                         85.99
 85.96                         1987                         85.99

 86.06                         1987                         86.09
 86.07                         1990                         86.09

 86.27                         1986                   86.22-86.23
 86.28                         1988                         86.22
 86.93                         1987                         86.89

 88.90                         1986                         88.39
 88.91                         1986                         89.15
 88.92                         1986                         89.39
 88.93                         1986                         89.15
 88.94                         1986                         89.39
 88.95                         1986                         89.29
 88.97                         1989                         88.99
 88.98                         1989                         88.90
 88.99                         1986                         89.39

 89.10                         1989                         89.15
 89.17-89.18                   1988                         89.15
 89.19                         1989                         89.15

 89.50                         1991                         89.54

 93.90                         1988                         93.92

 94.61-94.69                   1989                         94.25

 96.6                          1986                         96.35

 96.70                          1991            93.92 (Code Deleted)
 96.71                          1991            93.92 (Code Deleted)
 96.72                          1991            93.92 (Code Deleted)

 97.05                          1989                         51.97

 98.51-98.52                    1989            59.96 (Code Deleted)
 98.59                          1989            59.96 (Code Deleted)

 99.15                          1986                         99.29
 99.71-99.79*                   1988                         99.07

 99.85                          1987                         93.35
 99.86                          1987                         93.39
 99.88                          1988                         99.83


  **Codes 99.71-99.79 were deleted in October 1987; their contents
  were not transferred elsewhere.  In the October 1988 revision,
  codes 99.71-99.79 were reclassified as "Therapeutic apheresis."

APPENDIX C
 Civilian Population* by Sex/Age/Geographic Region and Race:

 Civilian Population* by Sex, Age, Geographic Region and Race:
    United States, July 1, 1991

            {Population estimates consistent with Series P-25,
          Current Population Reports, U.S. Bureau of the Census}

               Age, geographic          Both
               region and race        sexes         Male     Female

                   All ages                 Population in thousands

   Total                             250,566     121,539     129,027

   Region:
      Northeast                       50,871      24,433      26,439
      Midwest                         60,090      29,139      30,951
      South                           86,067      41,456      44,612
      West                            53,537      26,511      27,026

   Race:
      White                          209,647     102,132     107,515
      Black                           30,854      14,492      16,362
      All other                       10,065       4,915       5,150

                   Under 15 years

   Total                              55,130      28,224      26,906

      Under 1 year                     4,011       2,052       1,959
      1-4 years                       15,210       7,784       7,426
      5-14 years                      35,909      18,389      17,520

   Region:
      Northeast                       10,263       5,256       5,007
      Midwest                         13,350       6,837       6,513
      South                           18,957       9,695       9,261
      West                            12,561       6,436       6,125

   Race:
      White                           43,924      22,546      21,378
      Black                            8,568       4,335       4,233
      All other                        2,638       1,344       1,295

 *The NHDS used the civilian noninstitutional population to calculate hospital
  utilization rates from 1965 through 1983.  Beginning in 1981, the civilian
  resident population has been used to calculate rates.  If you have purchased
  NHDS tapes for years before 1981 and calculated rates using the civilian non-
  institutionalized population provided in the documentation, these rates will
  have to be adjusted to be comparable to 1991 rates using the civilian
  resident population.


              15-44 years

 Total                            116,973      58,063      58,909

   15-24  years                    35,727      18,011      17,715
   25-34  years                    42,249      20,873      21,376
   35-44  years                    38,997      19,178      19,819

 Region:
   Northeast                      23,625      11,689      11,936
   Midwest                        27,676      13,753      13,925
   South                          39,984      19,624      20,361
   West                           25,687      12,997      12,690

 Race:
   White                           96,715      48,424      48,291
   Black                           15,045       7,087       7,958
   All other                        5,213       2,551       2,661

                  45-64 years

 Total                             46,710      22,461      24,249

   45-54 years                     25,706      12,531      13,175
   55-64 years                     21,004       9,931      11,073

 Region:
   Northeast                        9,939       4,729       5,209
   Midwest                         11,206       5,414       5,792
   South                           16,185       7,727       8,458
   West                             9,379       4,590       4,789

 Race:
   White                           40,428      19,626      20,802
   Black                            4,687       2,088       2,600
   All other                        1,594         747         847

                 65 years and over

 Total                             31,753      12,791      18,963

   65-74 years                     18,280       8,022      10,258
   75-84 years                     10,314       3,888       6,426
   85 years and over                3,160         881       2,279

 Region:
   Northeast                        7,043       2,758       4,287
   Midwest                          7,857       3,135       4,722
   South                           10,942       4,409       6,532
   West                             5,911       2,488       3,424

 Race:
   White                           28,580       11,536      17,044
   Black                            2,553          982       1,572
   All other                          620          273         347

Civilian Population by Age/Sex/Race, Ages 0-19
                                  All races                              White
 Age     Total         Male        Female        Total        Male      Female



 Total 250,565,896 121,539,152 129,026,744 209,646,634  102,131,928 107,514,706

 0-4  19,221,659    9,835,987   9,385,672   15,167,687   7,779,875   7,387,812
  0    4,011,405    2,052,060   1,959,345    3,102,296   1,591,062   1,511,234
  1    3,968,794    2,030,408   1,938,386    3,129,049   1,604,411   1,524,638
  2    3,805,924    1,949,181   1,856,743    3,013,254   1,546,435   1,466,819
  3    3,718,227    1,902,125   1,816,102    2,957,216   1,516,792   1,440,424
  4    3,717,309    1,902,213   1,815,096    2,965,872   1,521,175   1,444,697


 5-9  18,237,431    9,337,408   8,900,023   14,634,220   7,511,587   7,122,633
  5    3,702,267    1,896,741   1,805,526    2,967,063   1,523,726   1,443,337
  6    3,681,281    1,884,016   1,797,265    2,962,793   1,519,657   1,443,136
  7    3,575,290    1,829,107   1,746,183    2,870,182   1,472,842   1,397,340
  8    3,511,965    1,797,329   1,714,636    2,819,652   1,446,563   1,373,089
  9    3,766,628    1,930,215   1,836,413    3,014,530   1,548,799   1,465,731


 10-14 17,671,314   9,051,181   8,620,133   14,121,838   7,254,234   6,867,604
  10    3,703,208   1,899,473   1,803,735    2,966,016   1,525,616   1,440,400
  11    3,661,556   1,875,159   1,786,397    2,928,640   1,504,421   1,424,219
  12    3,483,780   1,782,652   1,701,128    2,773,580   1,423,594   1,349,986
  13    3,414,045   1,746,407   1,667,638    2,733,118   1,402,429   1,330,689
  14    3,408,725   1,747,490   1,661,235    2,720,484   1,398,174   1,322,310


 15-19 17,051,006   8,697,533   8,353,473   13,629,614   6,970,712   6,658,902
  15    3,292,674   1,689,565   1,603,109    2,624,383   1,349,939   1,274,444
  16    3,361,946   1,731,537   1,630,409    2,692,363   1,388,860   1,303,503
  17    3,358,622   1,731,230   1,627,392    2,680,945   1,384,718   1,296,227
  18    3,336,044   1,691,636   1,644,408    2,664,188   1,355,204   1,308,984
  19    3,701,720   1,853,565   1,848,155    2,967,735   1,491,991   1,475,744


                     Black                                Other Races
 Age   Total         Male       Female          Total        Male      Female



 Total  30,854,035  14,492,360  16,361,675   10,065,227  4,914,864  5,150,363

 0-4  3,099,248   1,568,421   1,530,827      954,724    487,691    467,033
  0     677,391     342,934     334,457      231,718    118,064    113,654
  1     645,001     326,126     318,875      194,744     99,871     94,873
  2     613,346     310,996     302,350      179,324     91,750     87,574
  3     583,202     294,737     288,465      177,809     90,596     87,213
  4     580,308     293,628     286,680      171,129     87,410     83,719


 5-9  2,746,688   1,390,766   1,355,922      856,523    435,055    421,468
  5     561,856     284,488     277,368      173,348     88,527     84,821
  6     548,835     278,397     270,438      169,653     85,962     83,691
  7     535,760     270,308     265,452      169,348     85,957     83,391
  8     523,440     265,242     258,198      168,873     85,524     83,349
  9     576,797     292,331     284,466      175,301     89,085     86,216


 10-14  2,722,254  1,376,093   1,346,161     827,222    420,854    406,368
   10     559,728    283,480     276,248     177,464     90,377     87,087
   11     564,931    285,288     279,643     167,985     85,450     82,535
   12     545,932    275,967     269,965     164,268     83,091     81,177
   13     520,997    262,781     258,216     159,930     81,197     78,733
   14     530,666    268,577     262,089     157,575     80,739     76,836


 15-19  2,615,482  1,313,308   1,302,174     805,910    413,513    392,397
   15     510,557    258,794     251,763     157,734     80,832     76,902
   16     512,876    261,586     251,290     156,707     81,091     75,616
   17     515,580    262,640     252,940     162,097     83,872     78,225
   18     516,547    257,093     259,454     155,309     79,339     75,97O
   19     559,922    273,195     286,727     174,063     88,379     85,684

Civilian Population by Age/Sex/Race, Ages 20-44

                             All races                                   White
 Age       Total       Male       Female        Total         Male      Female



 20-24  18,675,525   9,313,862   9,361,663  15,229,703   7,643,279   7,586,424
   20    3,960,808   1,980,662   1,980,146   3,202,991   1,608,510   1,594,481
   21    3,853,162   1,925,341   1,927,821   3,136,512   1,574,000   1,562,512
   22    3,627,390   1,809,584   1,817,806   2,977,056   1,494,961   1,482,095
   23    3,539,746   1,762,294   1,777,452   2,885,489   1,447,787   1,437,702
   24    3,694,419   1,835,981   1,858,438   3,027,655   1,518,021   1,509,634

 25-29  20,341,534  10,062,220  10,279,314  16,746,074   8,360,250   8,385,824
   25    3,752,051   1,860,277   1,891,774   3,061,621   1,531,153   1,530,468
   26    3,960,668   1,954,890   2,005,778   3,250,724   1,618,705   1,632,019
   27    4,141,567   2,050,111   2,091,456   3,415,422   1,706,410   1,709,012
   28    3,993,182   1,971,498   2,021,684   3,308,399   1,648,370   1,660,029
   29    4,494,066   2,225,444   2,268,622   3,709,908   1,855,612   1,854,296

 30-34  21,907,014  10,810,700  11,096,314  18,230,806   9,097,968   9,132,838
   30    4,423,122   2,182,795   2,240,327   3,676,965   1,834,427   1,842,538
   31    4,360,733   2,152,727   2,208,006   3,620,512   1,807,234   1,813,278
   32    4,320,474   2,128,687   2,191,787   3,593,462   1,790,836   1,802,626
   33    4,325,777   2,127,395   2,198,382   3,614,476   1,797,804   1,816,672
   34    4,476,908   2,219,096   2,257,812   3,725,391   1,867,667   1,857,724

 35-39  20,338,144  10,010,295  10,327,849  17,030,765   8,479,831   8,550,934
   35    4,271,164   2,105,221   2,165,943   3,555,053   1,771,981   1,783,072
   36    4,149,667   2,044,008   2,105,659   3,471,086   1,730,332   1,740,754
   37    4,082,663   2,005,855   2,076,808   3,418,040   1,698,557   1,719,483
   38    3,744,895   1,835,671   1,909,224   3,153,374   1,563,906   1,589,468
   39    4,089,755   2,019,540   2,070,215   3,433,212   1,715,055   1,718,157

 40-44  18,659,170   9,167,928   9,491,242  15,847,763   7,871,840   7,975,923
   40    3,803,367   1,867,145   1,936,222   3,187,117   1,583,510   1,603,607
   41    3,692,540   1,810,800   1,881,740   3,102,168   1,539,493   1,562,675
   42    3,609,385   1,769,220   1,840,165   3,056,622   1,514,358   1,542,264
   43    3,567,839   1,744,165   1,823,674   3,033,716   1,499,380   1,534,336
   44    3,986,039   1,976,598   2,009,441   3,468,140   1,735,099   1,733,041

                           Black                             Other Races
 Age       Total         Male       Female       Total      Male     Female


 20-24  2,564,882    1,220,787    1,344,095     880,940   449,796    431,144
   20     573,009      277,272      295,737     184,808    94,880     89,928
   21     531,745      255,735      276,010     184,905    95,606     89,299
   22     477,489      226,359      251,130     172,845    88,264     84,581
   23     486,788      229,361      257,427     167,469    85,146     82,323
   24     495,851      232,060      263,791     170,913    85,900     85,013


 25-29  2,677,135    1,249,002    1,428,133     918,325   452,968    465,357
   25     514,794      241,053      273,741     175,636    88,071     87,565
   26     530,409      247,585      282,824     179,535    88,600     90,935
   27     539,706      251,856      287,850     186,439    91,845     94,594
   28     506,879      236,219      270,660     177,904    86,909     90,995
   29     585,347      272,289      313,058     198,811    97,543    101,268


 30-34  2,712,683    1,249,112    1,463,571     963,525   463,620    499,905
   30     549,762      253,173      296,589     196,395    95,195    101,200
   31     546,044      252,242      293,802     194,177    93,251    100,926
   32     534,862      245,431      289,431     192,150    92,420     99,730
   33     524,275      240,225      284,050     187,026    89,366     97,660
   34     557,740      258,041      299,699     193,777    93,388    100,389


 35-39  2,430,899    1,116,541    1,314,358     876,480   413,923    462,557
   35     525,619      242,596      283,023     190,492    90,644     99,848
   36     500,832      229,477      271,355     177,749    84,199     93,550
   37     489,369      224,592      264,777     175,254    82,706     92,548
   38     430,376      196,330      233,846     161,345    75,435     85,910
   39     484,903      223,546      261,357     171,640    80,939     90,701


 40-44  2,043,933      938,630    1,105,303     767,474   357,458    410,016
   40     448,328      205,109      243,219     167,922    78,526     89,396
   41     428,002      195,739      232,263     162,370    75,568     86,802
   42     401,355      184,172      217,183     151,408    70,690     80,718
   43     382,223      174,837      207,386     151,900    69,948     81,952
   44     384,025      178,773      205,252     133,874    62,726     71,148

Civilian Population by Age/Sex/Race, Ages 45-69
                  All races                                White
 Age     Total         Male       Female      Total         Male       Female


 45-49  14,066,752   6,880,052   7,186,700   12,073,018  5,961,144   6,111,874
  45     2,823,989   1,384,061   1,439,928    2,406,585  1,191,669   1,214,916
  46     2,814,163   1,377,138   1,437,025    2,410,166  1,191,745   1,218,421
  47     2,842,686   1,386,941   1,455,745    2,432,763  1,198,449   1,234,314
  48     2,851,877   1,392,620   1,459,257    2,490,338  1,226,561   1,263,777
  49     2,734,037   1,339,292   1,394,745    2,333,166  1,152,720   1,180,446


 50-54  11,638,973   5,650,469   5,988,504   10,007,637  4,902,918   5,104,719
  50     2,525,690   1,231,503   1,294,187    2,169,490  1,067,161   1,102,329
  51     2,338,073   1,137,831   1,200,242    2,004,644    984,528   1,020,116
  52     2,296,438   1,114,621   1,181,817    1,978,809    968,983   1,009,826
  53     2,279,151   1,103,879   1,175,272    1,963,099    959,596   1,003,503
  54     2,199,621   1,062,635   1,136,986    1,891,595    922,650     968,945


 55-59  10,421,776   4,985,493   5,436,283    9,035,644  4,366,265   4,669,379
  55     2,128,163   1,022,140   1,106,023    1,824,863    884,407     940,456
  56     2,194,895   1,053,443   1,141,452    1,908,799    926,608     982,191
  57     2,068,091     990,918   1,077,173    1,788,830    865,185     923,645
  58     1,945,742     927,227   1,018,515    1,697,102    816,869     880,233
  59     2,084,885     991,765   1,093,120    1,816,050    873,196     942,854


 60-64  10,592,096   4,945,017   5,637,079    9,312,026  4,395,706   4,916,320
  60     2,123,576     994,307   1,129,269    1,858,390    878,672     979,718
  61     2,099,890     993,743   1,106,147    1,847,080    883,943     963,137
  62     2,076,303     971,055   1,105,248    1,822,192    861,271     960,921
  63     2,144,662   1,003,914   1,140,748    1,900,018    898,368   1,001,650
  64     2,137,665     981,998   1,155,667    1,884,346    873,452   1,010,894


 65-69  10,037,375   4,491,366   5,546,009    8,925,526  4,019,093   4,906,433
  65     2,071,681     939,332   1,132,349    1,820,353    832,837     987,516
  66     2,068,542     932,801   1,135,741    1,837,854    832,707   1,005,147
  67     2,026,366     910,033   1,116,333    1,806,213    818,763     987,450
  68     1,910,507     847,550   1,062,957    1,703,412    758,725     944,687
  69     1,960,279     861,650   1,098,629    1,757,694    776,061     981,633

                        Black                             Other Races
  Age      Total        Male      Female        Total       Male     Female


 45-49   1,447,743     658,034    789,709       545,991    260,874     285,117
  45       296,047     134,905    161,142       121,357     57,487      63,870
  46       291,676     132,147    159,529       112,321     53,246      59,075
  47       298,191     134,950    163,241       111,732     53,542      58,190
  48       264,306     119,570    144,736        97,233     46,489      50,744
  49       297,523     136,462    161,061       103,348     50,110      53,238


 50-54   1,210,120     543,781    666,339        421,216    203,770    217,446
  50       260,347     117,563    142,784         95,853     46,779     49,074
  51       246,605     111,428    135,177         86,824     41,875     44,949
  52       235,905     105,990    129,915         81,724     39,648     42,076
  53       237,433     106,255    131,178         78,619     38,028     40,591
  54       229,830     102,545    127,285         78,196     37,440     40,756


 55-59   1,050,389     464,174    586,215        335,743    155,054    180,689
  55       228,877     102,341    126,536         74,423     35,392     39,031
  56       217,399      94,521    122,878         68,697     32,314     36,383
  57       211,715      94,510    117,205         67,546     31,223     36,323
  58       188,493      83,354    105,139         60,147     27,004     33,143
  59       203,905      89,448    114,457         64,930     29,121     35,809


 60-64     979,111     421,819    557,292        290,959    127,492    163,467
  60       202,604      87,789    114,815         62,582     27,846     34,736
  61       193,763      83,672    110,091         59,047     26,128     32,919
  62       195,801      84,328    111,473         58,310     25,456     32,854
  63       189,420      81,495    107,925         55,224     24,051     31,173
  64       197,523      84,535    112,988         55,796     24,011     31,785


 65-69     873,190     367,065    506,125        238,659    105,208    133,451
  65       197,872      83,338    114,534         53,456     23,157     30,299
  66       181,785      78,955    102,830         48,903     21,139     27,764
  67       173,104      70,515    102,589         47,049     20,755     26,294
  68       161,326      68,122     93,204         45,769     20,703     25,066
  69       159,103      66,135     92,968         43,482     19,454     24,028

Civilian Population by Age/Sex/Race, Ages 70-94
                  All races                                White
  Age     Total       Male     Female     Total        Male        Female

 70-74  8,242,309  3,530,770  4,711,539   7,411,771  3,192,715   4,219,056
  70    1,885,626    828,010  1,057,616   1,687,773    746,584     941,189
  71    1,731,378    750,067    981,311   1,550,719    675,207     875,512
  72    1,648,669    709,919    938,750   1,484,157    642,215     841,942
  73    1,518,235    636,781    881,454   1,372,234    578,754     793,480
  74    1,458,401    605,993    852,408   1,316,888    549,955     766,933


 75-79  6,279,233  2,482,262  3,796,971   5,679,262  2,252,029   3,427,233
  75    1,405,178    576,025    829,153   1,271,395    523,534     747,861
  76    1,334,486    539,541    794,945   1,211,476    491,810     719,666
  77    1,244,448    490,949    753,499   1,125,392    446,057     679,335
  78    1,204,470    462,061    742,409   1,086,499    418,494     668,005
  79    1,090,651    413,686    676,965     984,500    372,134     612,366


 80-84  4,034,671  1,405,636  2,629,035   3,677,429  1,277,051   2,400,378
  80      970,199    352,312    617,887     881,337    320,148     561,189
  81      882,777    314,481    568,296     802,314    284,850     517,464
  82      799,422    278,782    520,640     732,194    254,292     477,902
  83      738,569    249,380    489,189     676,454    227,542     448,912
  84      643,704    210,681    433,023     585,130    190,219     394,911


 85-89  2,090,211    624,783  1,465,428   1,914,913    567,134   1,347,779
  85      540,662    171,082    369,580     496,070    155,982     340,088
  86      494,991    151,121    343,870     451,863    136,587     315,276
  87      418,768    123,601    295,167     383,769    112,185     271,584
  88      351,846    100,158    251,688     322,245     90,722     231,523
  89      283,944     78,821    205,123     260,966     71,658     189,308


 90-94    811,728    201,184    610,544     740,922    180,597     560,325
  90      260,870     69,103    191,767     234,525     61,066     173,459
  91      196,454     49,719    146,735     178,875     44,489     134,386
  92      145,720     34,720    111,000     135,027     31,696     103,331
  93      115,477     26,634     88,843     106,816     24,328      82,488
  94       93,207     21,008     72,199      85,679     19,018      66,661


                   Black                             Other Races
 Age    Total      Male      Female       Total      Male      Female

 70-74  663,400   264,252    399,148    167,138     73,803     93,335
  70    156,589    62,689     93,900     41,264     18,737     22,527
  71    144,402    58,572     85,830     36,257     16,288     19,969
  72    130,368    52,796     77,572     34,144     14,908     19,236
  73    117,671    45,969     71,702     28,330     12,058     16,272
  74    114,370    44,226     70,144     27,143     11,812     15,331


 75-79  488,763   181,082    307,681    111,208     49,151     62,057
  75    107,773    41,297     66,476     26,010     11,194     14,816
  76     99,312    37,445     61,867     23,698     10,286     13,412
  77     96,933    35,089     61,844     22,123      9,803     12,320
  78     97,480    34,424     63,056     20,491      9,143     11,348
  79     87,265    32,827     54,438     18,886      8,725     10,161


 80-84  296,609   100,835    195,774     60,633     27,750     32,883
  80     73,406    25,093     48,313     15,456      7,071      8,385
  81     67,277    23,623     43,654     13,186      6,008      7,178
  82     55,654    19,223     36,431     11,574      5,267      6,307
  83     51,393    16,909     34,484     10,722      4,929      5,793
  84     48,879    15,987     32,892      9,695      4,475      5,220


 85-89  147,495    45,802    101,693     27,803     11,847     15,956
  85     37,398    11,986     25,412      7,194      3,114      4,080
  86     36,369    11,564     24,805      6,759      2,970      3,789
  87     29,438     9,046     20,392      5,561      2,370      3,191
  88     25,054     7,549     17,505      4,547      1,887      2,660
  89     19,236     5,657     13,579      3,742      1,506      2,236


 90-94   59,885    16,611     43,274     10,921      3,976      6,945
  90     22,596     6,587     16,009      3,749      1,450      2,299
  91     14,842     4,184     10,658      2,737      1,046      1,691
  92      8,848     2,383      6,465      1,845        641      1,204
  93      7,205     1,827      5,378      1,456        479        977
  94      6,394     1,630      4,764      1,134        360        774

Civilian Population by Age/Sex/Race, Ages 95-100+, 0-85+

               All races                             White
 Age     Total      Male      Female      Total      Male       Female


 95-99   214,007   45,333    168,674     193,801    40,287     153,514
  95      73,966   16,379     57,587      67,544    14,728      52,816
  96      53,543   11,484     42,059      48,701    10,288      38,413
  97      38,487    7,947     30,540      34,904     7,081      27,823
  98      28,470    5,714     22,756      25,364     4,953      20,411
  99      19,541    3,809     15,732      17,288     3,237      14,051


 100+     43,968    9,673     34,295      36,215     7,413      28,802


 0-14    55,130,404  28,224,576  26,905,828  43,923,745  22,545,696  21,378,049
 15-44  116,972,393  58,062,538  58,909,855  96,714,725  48,423,880  48,290,845
 45-64   46,709,597  22,461,031  24,248,566  40,428,325  19,626,033  20,802,292


 15+  195,435,492  93,314,576  102,120,916  165,722,889  79,586,232  86,136,657
 45+   78,463,099  35,252,038   43,211,061   69,008,164  31,162,352  37,845,812
 65+   31,753,502  12,791,007   18,962,495   28,579,839  11,536,319  17,043,520
 75+   13,473,818   4,768,871    8,704,947   12,242,542   4,324,511   7,918,031
 85+    3,159,914     880,973    2,278,941    2,885,851     795,431   2,090,420


                  Black                             Other Races
  Age   Total        Male      Female         Total       Male     Female


 95-99   17,352     4,309      13,043         2,854       737      2,117
  95      5,513     1,403       4,110           909       248        661
  96      4,129     1,026       3,103           713       170        543
  97      3,062       741       2,321           521       125        396
  98      2,696       652       2,044           410       109        301
  99      1,952       487       1,465           301        85        216


 100+     6,774     1,936       4,838           979        324       655


 0-14   8,568,190   4,335,280   4,232,910   2,638,469  1,343,600  1,294,869
 15-44 15,045,014   7,087,380   7,957,634   5,212,654  2,551,278  2,661,376
 45-64  4,687,363   2,087,808   2,599,555   1,593,909    747,190    846,719


 15+   22,285,845  10,157,080  14,830,848   7,426,758  3,571,264  3,855,494
 45+    7,240,831   3,069,700   4,171,131   2,214,104  1,019,986  1,194,118
 65+    2,553,468     981,892   1,571,576     620,195    272,796    347,399
 75+    1,016,878     350,575     666,303     214,398     93,785    120,613
 85+      231,506      68,658     162,848      42,557     16,884     25,673

Civilian Population by Sex/Age/Geographic Region, Ages 0-85+

       Civilian Population by Sex, Age, and Geographic Region:
              United States, July 1, 1991

       United                                         United
 Age   States   Northeast MidWest    South     West   States  Northeast Midwest

                    Both sexes                               Males

 Total  250,566   50,871  60,090   86,067   53,537    121,539   24,433  29,139


 0-14    55,130   10,263  13,350   18,957   12,561     28,224    5,256   6,837
  0-4    19,222    3,672   4,487    6,526    4,538      9,836    1,880   2,296
  5-9    18,237    3,361   4,463    6,264    4,149      9,337    1,723   2,286
 10-14   17,671    3,230   4,400    6,167    3,874      9,051    1,653   2,255

 15-44  116,973   23,625  27,676   39,984   25,687     58,063   11,689  13,753
 15-19   17,051    3,247   4,175    6,043    3,586      8,698    1,651   2,130
 20-24   18,676    3,840   4,434    6,400    4,002      9,314    1,913   2,209
 25-29   20,342    4,147   4,690    6,937    4,567     10,062    2,049   2,314
 30-34   21,907    4,448   5,153    7,393    4,914     10,811    2,192   2,543
 35-39   20,338    4,108   4,820    6,862    4,547     10,010    2,018   2,385
 40-44   18,659    3,835   4,404    6,349    4,071      9,168    1,866   2,172


 45-64   46,710    9,939  11,206   16,185    9,379     22,460    4,729   5,414
 45-49   14,067    2,946   3,302    4,847    2,971      6,880    1,422   1,618
 50-54   11,639    2,433   2,798    4,038    2,370      5,650    1,167   1,361
 55-59   10,422    2,222   2,523    3,642    2,035      4,985    1,054   1,212
 60-64   10,582    2,338   2,583    3,658    2,003      4,945    1,086   1,223


 65+     31,753    7,043   7,857   10,942    5,911     12,791    2,758   3,135
 65-69   10,037    2,200   2,413    3,502    1,923      4,491      970   1,090
 70-74    8,242    1,827   2,002    2,854    1,559      3,531      763     850
 75-79    6,279    1,398   1,559    2,167    1,155      2,482      535     611
 80-84    4,035      899   1,025    1,390      720      1,406      300     351
 85+      3,160      719     858    1,029      554        881      190     233

                           United
 Age    South     West     States    Northeast  Midwest     South     West


        Males                                 Females


 Total  41,456    26,511     129,027    26,439    30,951   44,612   27,026

 0-14    9,695     6,436      26,906     5,007     6,513    9,261    6,125
 0-4     3,337     2,323       9,386     1,792     2,191    3,188    2,215
 5-9     3,202     2,126       8,900     1,638     2,177    3,062    2,023
 10-14   3,156     1,987       8,620     1,577     2,145    3,011    1,887

 15-44  19,624    12,997      58,909    11,936    13,925   20,361   12,690
 15-19   3,067     1,850       8,353     1,596     2,045    2,977    1,736
 20-24   3,135     2,057       9,362     1,927     2,225    3,265    1,945
 25-29   3,383     2,316      10,279     2,098     2,377    3,554    2,251
 30-34   3,606     2,470      11,096     2,256     2,610    3,787    2,444
 35-39   3,335     2,272      10,328     2,090     2,436    3,527    2,275
 40-44   3,098     2,032       9,491     1,969     2,232    3,251    2,039

 45-64   7,727     4,590      24,249     5,209     5,792    8,458    4,789
 45-49   2,362     1,478       7,187     1,524     1,684    2,485    1,493
 50-54   1,949     1,173       5,989     1,266     1,437    2,089    1,197
 55-59   1,727       992       5,436     1,167     1,311    1,915    1,043
 60-64   1,689       947       5,637     1,252     1,360    1,969    1,056

 65+     4,409     2,488      18,963     4,287     4,722    6,532    3,424
 65-69   1,557       874       5,546     1,230     1,323    1,945    1,049
 70-74   1,222       695       4,712     1,064     1,152    1,632      864
 75-79     853       483       3,797       863       948    1,314      672
 80-84     485       270       2,629       600       674      904      451
 85+       292       166       2,279       530       625      737      388

 Estimates after 4/1/90 are consistent with Dept. of Commerce Press Release
 CB92-93.  They are based on methodology described in Current Population
 Reports Series P-25 No.101.



This page last reviewed: Thursday, January 28, 2016
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