Births Data Summary

Group Results By:		Select up to five variables to group (summarize, stratify, index) your data. For example, you could select to group your data by Year, State, Race and Gestational Age. See How do I organize my data? for more information.
Select Measures:		Birth rates, fertility rates and other optional measures are available for the Natality data beginning in year 2003. Select the check box to calculate these measures for your query criteria. The number of live births is always calculated by default.
Title:		Enter any desired description to display as a title with your results.

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Group Results By

Select up to five variables that serve as keys for grouping your data. For example, you could select to group (summarize, stratify, index) your data by Year, State, and Race.

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Birth Rates

Birth rates are calculated as the number of births divided by total population in the given year(s).

When the numerator is sub-set by mother's race category, Hispanic origin category, location, or year of birth, then the same sub-set for race, Hispanic origin category, location and year applies to the denominator population. If the data are sub-set by any other variable, then birth rates and denominator data are not available.

See Denominator Population Sources below for more information.

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Fertility Rates

Fertility rates are calculated as the number of births divided by the number of females age 15 - 44 years old in the given year(s).

When the numerator is sub-set by mother's age, mother's race category, Hispanic origin category, location, or year of birth, then the same sub-set for age, race, Hispanic origin category, location and year applies to the denominator population. If data are sub-set by any other variable, then fertility rates and denominator data are not available.

See Denominator Population Sources below for more information.

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Denominator Population Sources

The current population sources for calculating birth and fertility rates come from these sources:

• Rates for year 2023: 
  • the July 1st, 2023 (Vintage 2023) postcensal single-race estimates of the resident population, released by the Census Bureau on June 27, 2024. The methodology states the 2020 - 2023 series of estimates are based on the Modified Blended Base produced by the US Census Bureau in lieu of the April 1, 2020 decennial population count. The Modified Blended Base consists of the blend of Vintage 2020 postcensal population estimates for April 1, 2020, 2020 Demographic Analysis Estimates, and 2020 Census data from the internal Census Edited File (CEF).
• Rates for year 2022: 
  • the July 1st, 2022 (Vintage 2022) postcensal single-race estimates of the resident population, released by the Census Bureau on June 22, 2023. The methodology states the 2020 - 2022 series of estimates are based on the Modified Blended Base produced by the US Census Bureau in lieu of the April 1, 2020 decennial population count. The Modified Blended Base consists of the blend of Vintage 2020 postcensal population estimates for April 1, 2020, 2020 Demographic Analysis Estimates, and 2020 Census data from the internal Census Edited File (CEF).
• Rates for year 2021: 
  • the July 1st, 2021 (Vintage 2021) postcensal single-race estimates of the resident population, released by the Census Bureau on June 30, 2022. The methodology states the 2020 - 2021 series of estimates are based on the Blended Base produced by the US Census Bureau in lieu of the April 1, 2020 decennial population count. The Blended Base consists of the blend of Vintage 2020 postcensal population estimates, 2020 Demographic Analysis Estimates, and 2020 Census PL 94-171 Redistricting File.
• Rates for year 2020: 
  • July 1st, 2020 (Vintage 2020) postcensal single-race estimates of the resident population, released by the Census Bureau on July 27, 2021. The methodology states the 2010 - 2020 series of estimates are based on the April 1st, 2010 Census counts.
  • Note: Beginning with 2020, bridged-race population estimates are no longer included for rate calculations.
• Rates for year 2019: 
  • July 1st, 2019 (Vintage 2019) postcensal single-race estimates of the resident population, released by the Census Bureau on June 25, 2020.
  • July 1st, 2019 (Vintage 2019) postcensal bridged-race estimates of the resident population, released by NCHS on July 9, 2020.
• Rates for year 2018: 
  • July 1st, 2018 (Vintage 2018) postcensal single-race estimates of the resident population, released by the Census Bureau on June 20, 2019.
  • July 1st, 2018 (Vintage 2018) postcensal bridged-race estimates of the resident population, released by NCHS on June 25, 2019.
• Rates for year 2017: 
  • July 1st, 2017 (Vintage 2017) postcensal single-race estimates of the resident population, released by the Census Bureau on June 21, 2018.
  • July 1st, 2017 (Vintage 2017) postcensal bridged-race estimates of the resident population, released by NCHS on June 27, 2018.
• Rates for year 2016: 
  • July 1st, 2016 (Vintage 2016) postcensal single-race estimates of the resident population, released by the Census Bureau on June 22, 2017.
  • July 1st, 2016 (Vintage 2016) postcensal bridged-race estimates of the resident population, released by NCHS on June 26, 2017.
• Rates for year 2015:  July 1st, 2015 (Vintage 2015) postcensal bridged-race estimates of the resident population, released by NCHS on June 28, 2016.
• Rates for year 2014:  the July 1st, 2014 (Vintage 2014) postcensal bridged-race estimates of the resident population, released by NCHS on June 30, 2015.
• Rates for year 2013:  July 1st, 2013 (Vintage 2013) postcensal bridged-race estimates of the resident population, released by NCHS on June 26, 2014.
• Rates for year 2012:  July 1st, 2012 (Vintage 2012) postcensal bridged-race estimates of the resident population, released by NCHS on June 13, 2013.
• Rates for year 2011:  July 1st, 2011 (Vintage 2011) postcensal bridged-race estimates of the resident population, released by NCHS on July 18, 2012.
• Rates for year 2010:  April 1st, 2010 bridged-race Census counts for year 2010, released by NCHS on November 17, 2011.
• Rates for years 2003-2009:  July 1st revised intercensal estimates of the resident population, released by NCHS on October 26, 2012.

About Archive Rates and Populations

Archive rates and populations are available, in order to allow researchers to reproduce previously published rates. The archive populations displayed and used as the denominator for rates are bridged-race postcensal population estimates. Each year of archive population data is taken from the corresponding series year. For example, archive population data for 2009 is from the vintage 2009 series of postcensal population estimates, and the archive population data for 2008 is from the vintage 2008 series.

The archive denominator population sources for each year:

• 2009 from the 2000-2009 (Vintage 2009) postcensal estimates of the July 1 resident population by year, county, single-year age groups, bridged-race, sex, and Hispanic origin released by NCHS on July 23, 2010.
• 2008 from the 2000-2008 (Vintage 2008) postcensal estimates of the July 1 resident population by year, county, single-year age groups, bridged-race, sex, and Hispanic origin released by NCHS on September 2, 2009.
• 2007 from the 2000-2007 (Vintage 2007) postcensal estimates of the July 1 resident population by year, county, single-year age groups, bridged-race, sex, and Hispanic origin released by NCHS on September 5, 2008.
• 2006 from the 2000-2006 (Vintage 2006) postcensal estimates of the July 1 resident population by year, county, single-year age groups, bridged-race, sex, and Hispanic origin released by NCHS on August 16, 2007.
• 2005 from the 2000-2005 (Vintage 2005) postcensal estimates of the July 1 resident population by year, county, single-year age groups, bridged-race, sex, and Hispanic origin released by NCHS on August 16, 2006.
• 2004 from the 2000 to 2004 (Vintage 2004) postcensal estimates of the July 1 resident population by year, county, single-year age groups, bridged-race, sex, and Hispanic origin released by NCHS on September 8, 2005.
• 2003 from the 2000 to 2003 (Vintage 2003) postcensal estimates of the July 1 resident population by year, county, single-year age groups, bridged-race, sex, and Hispanic origin released by NCHS on September 14, 2004.

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Percent of Total Births

Calculates percentages for your query results. The percentages appear in a column, showing each row's percentage of the total births in the results table. The results table shows data for the live births that met your query criteria.

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Average Birth Weight

Calculates the average birth weight for your query results. The averages appear in a column, showing each row's average birth weight. The results table shows data for the live births that met your query criteria.

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Average Age of Mother

Calculates the average maternal age for your query results. The averages appear in a column, showing each row's average birth weight. The results table shows data for the live births that met your query criteria.

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Average Gestational Age (LMP)

Calculates the average gestational age of the infant, based on the Last Menstrual Period (LMP). The averages appear in a column, showing each row's average birth weight. The results table shows data for the live births that met your query criteria.

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Average Gestational Age (OE)

Calculates the average gestational age of the infant, based on the Obstetrician's Estimate (OE). The averages appear in a column, showing each row's average birth weight. The results table shows data for the live births that met your query criteria.

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Standard Deviation

Calculates the standard deviation for the selected average measures. The results are calculated for the live births that met your query criteria.

Limit the population to specific locations here. Alternately, you can leave the settings at the default values (the United States) and choose to organize or group the data results by State to show these stratifications. See Step 2a to select Urbanization and Metro/Nonmetro categories for mother's county of residence, in the classifications for 2006 and 2013.

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Location

This dataset includes states (no territories) and counties with a total population over 100,000 persons. Limit your data request to specific locations here. You can select any number of locations. The default settings are national data, the United States.

Limit the population to specific locations here, as categorized for Metro/Nonmetro and urban-rural areas. Alternately, you can leave the settings at the default values (the United States) and choose to organize or group the data results by these fields to show these stratifications. Select Urbanization and Metro/Nonmetro categories for mother's county of residence, in the classifications for 2006 and 2013.

Limit your data for any of the following data elements:

1. Marital Status - Married; Unmarried; Unknown or Not Stated; Not Available.
2. Age of Mother - under 15 years; 5 year age groups through age 54.
   Available Years 2007-2023:
   Mother's age is available in the following sets of age groups:

   • 9 groups with a category for under 15 years; groups of 5-year increments for older mothers; and a category for 50 years and over.
   • 10 groups with a category for under 15 years; categories for 15-17 years; 18-19 years; and 5-year age increments for older mothers; and a category for 50 years and over.
   • 13 groups with categories for under 15 years; single-year age categories for 15, 16, 17, 18, and 19 year old mothers; and 5-year age increments for older mothers; and a category for 50 years and over.
3. Maternal Race
   Available through year 2006:
   Race categories - American Indian or Alaska Native; Black; Chinese; Filipino; Guamanian; Hawaiian (includes part-Hawaiian); Japanese; Other Asian; White.
   Available Years 2003-2019:
   "Bridged Race" categories - American Indian or Alaska Native; Asian or Pacific Islander; Black or African American; White.
   Mother's Bridged Race data are not available for live births in 2020 and later years.
   Available Years 2016-2023:
   "Single Race" categories - American Indian or Alaska Native; Asian; Black or African American; Native Hawaiian or Other Pacific Islander; White; More than one race.
4. Maternal Hispanic Origin
   Available Years 1995-2002:
   Hispanic origin categories combined with race - Central or South American; Cuban; Mexican; Non-Hispanic Black; Non-Hispanic other races; Non-Hispanic White; Origin unknown or not stated; Other and Unknown Hispanic; Puerto Rican.
   Available Years 2003-2023:
   3 Hispanic origin categories - Hispanic or Latino; Not Hispanic or Latino; Origin unknown or not stated.
   8 Hispanic origin categories - Central or South American; Cuban; Dominican; Mexican; Non-Hispanic; Origin unknown or not stated; Other and Unknown Hispanic; Puerto Rican.
5. Maternal Education
   Available Years 1995-2006:
   Education categories: 0-8 years; 9-11 years; 12 years; 13-15 years; 16 years and over; Not stated/Not on Certificate; Excluded.
   Available Years 2007-2023:
   Education categories - 8th grade or less; 9th through 12th grade with no diploma; High school graduate or GED completed; Some college credit, but not a degree; Associate degree (AA, AS); Bachelor's degree (BA, AB, BS); Master's degree (MA, MS); Doctorate (PHD, EdD) or Professional Degree (MD, DDS, DVM, LLB, JD); Unknown/Not on certificate; Excluded.

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Maternal Hispanic Origin

This field indicates the Hispanic ethnicity of the mother.

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Maternal Race

Limit your data to the selected categories for the race of the mother. The default option is all race groups. Two sets of race groups are available:

1. 1995-2002 data:
   Nine race groups - American Indian or Alaska Native; Black; Chinese; Filipino; Guamanian; Hawaiian (includes part-Hawaiian); Japanese; Other Asian; White.
2. 2003-2019 data:
   Four "Bridged Race" groups - American Indian or Alaska Native; Asian or Pacific Islander; Black or African American; White.
   Mother's Bridged Race data are not available for live births in 2020 and later years.
3. 2016-2023 data:
   Six "Single Race" groups - American Indian or Alaska Native; Asian; Black or African American; Native Hawaiian or Other Pacific Islander; White; More than one race.

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Marital Status

This field indicates the marital status of the mother as recorded on the birth certificate.

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Age of Mother

This field indicates the age group of the mother at the time of birth. For births through year 2006, maternal age is available in 9 age groups: under 15 years; 5 year age groups through age 54. For births in years 2007-2023, maternal age is available in the following sets of age groups:

• 9 groups with a category for under 15 years; groups of 5-year increments for older mothers; and a category for 50 years and over.
• 10 groups with a category for under 15 years; categories for 15-17 years; 18-19 years; and 5-year age increments for older mothers; and a category for 50 years and over.
• 13 groups with categories for under 15 years; single-year age categories for 15, 16, 17, 18, and 19 year old mothers; and 5-year age increments for older mothers; and a category for 50 years and over.

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Maternal Education

This field indicates a range for the number of years of education received by the mother at the time of birth.

Limit your data for any of the following data elements:

1. Year: 1995-2002, or 2003-2006, or 2007-2023.
2. Gender (Sex) of Child: Female; Male.
3. Plurality or Multiple Birth: Single; Twin; Triplet or more.
4. Birth Weight: 499 grams or less; 500 - 999 grams; 1000 - 1499 grams; 1500 - 1999 grams; 2000 - 2499 grams; 2500 - 2999 grams; 3000 - 3499 grams; 3500 - 3999 grams; 4000 - 4499 grams; 4500 - 4999 grams; 5000 - 8165 grams; Not stated.
   Available Years 2007-2023:
   Infant's weight at birth is available in 3 sets of categories, through 8165 grams, or Not stated:

   • 12 groups in 500 gram increments;
   • 14 groups in 250 gram increments;
   • 100 gram increments.
5. Plurality or Multiple Birth: Single; Twin; Triplet or more.
6. Gestational Age at Birth : Under 20 weeks; 20 - 27 weeks; 28 - 31 weeks; 32 - 35 weeks; 36 weeks; 37 - 39 weeks; 40 weeks; 41 weeks; 42 weeks or more; Unknown.
   Available only for Years 2003 and later:
   Gestational age groups are available in 3 sets of categories, for infant ages at birth, based on Last Menstrual Period (LMP) or Obstetrician's Estimate (OE):

   • 10 age groups: Under 20 weeks; 20-27 weeks; 28-31 weeks; 32-35 weeks; 36 weeks; 37-39 weeks; 40 weeks; 41 weeks; 42 weeks or more; Unknown.
   • 11 age groups: Under 20 weeks; 20-27 weeks; 28-31 weeks; 32-33 weeks; 34-36 weeks; 37-38 weeks; 39 weeks, 40 weeks; 41 weeks; 42 or more weeks; Unknown.
   • Weekly age groups: 17 weeks through 47 weeks; Unknown.
7. Month of Birth: January-December.
8. Weekday of Birth: Weekend; Weekday.
9. Live Birth Order: 1st child born alive to mother - 6th child and over born alive to mother; Not Stated.
10. Birthplace - In Hospital; Not in Hospital; Unknown or Not Stated.
    Available Years 2007-2023:
    More birthplace categories: In Hospital; Freestanding Birth Center; Clinic/Doctor's Office; Residence; Other; Unknown.
11. Delivery Method: Vaginal; Cesarean, Not Stated.
12. Medical Attendant: Doctor of Medicine (MD); Doctor of Osteopathy (DO); Certified Nurse Midwife (CNM /CM); Other Midwife; Other; Unknown or Not Stated.
13. Month Prenatal Care Began : No prenatal care; 1st month through 10th month of pregnancy; Not stated/Not on Certificate; Excluded.

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Year

Pick any combination of years desired.

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Gender of Child

This field indicates the gender of the child as recorded on the birth certificate.

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Plurality or Multiple Birth

The Plurality field indicates if more than one infant shared the gestation and birth.

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Gestational Age at Birth

Select a range of weeks that represents the duration of the pregnancy at the time of birth.

NOTE: Beginning in 2014 NCHS changed the standard for gestational period from the Last Menstrual Period (LMP) based gestational age to the Obstetric/clinical Estimate (OE) based gestational age. Obstetric/clinical Estimate (OE) based gestational age groups are available for years 2007 and later in WONDER since February 2016. Refer to Measuring Gestational Age in Vital Statistics Data: Transitioning to the Obstetric Estimate for more information.

Data for years 1995-2002:

• Gestational Age at Birth:  Under 20 weeks; 20 - 27 weeks; 28 - 31 weeks; 32 - 35 weeks; 36 weeks; 37 - 39 weeks; 40 weeks; 41 weeks; 42 weeks or more; Unknown.

Data for years 2003 and later are organized in three groupings:

1. Gestational Age - Group1:  with 10 age groups Under 20 weeks; 20-27 weeks; 28-31 weeks; 32-35 weeks; 36 weeks; 37-39 weeks; 40 weeks; 41 weeks; 42 weeks or more; Unknown.
2. Gestational Age - Group2:  with 11 age groups Under 20 weeks; 20-27 weeks; 28-31 weeks; 32-33 weeks; 34-36 weeks; 37-38 weeks; 39 weeks; 40 weeks; 41 weeks; 42 or more weeks; Unknown.
3. Gestational Age - Weekly:  17 weeks; 18 weeks; 19 weeks; 20 weeks; 21 weeks; 22 weeks; 23 weeks; 24 weeks; 25 weeks; 26 weeks; 27 weeks; 28 weeks; 29 weeks; 30 weeks; 31 weeks; 32 weeks; 33 weeks; 34 weeks; 35 weeks; 36 weeks; 37 weeks; 38 weeks; 39 weeks; 40 weeks; 41 weeks; 42 weeks; 43 weeks; 44 weeks; 45 weeks; 46 weeks; 47 weeks; Unknown.

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Birth Weight

The Birth Weight field indicates weight ranges for the child at birth. For years 1995-2006, birth weight is available in the 12 categories list shown below. For years 2007 and later, the infant's weight at birth is available in 3 sets of categories, through 8165 grams, or Not stated:

• 12 groups in 500 gram increments;
• 14 groups in 250 gram increments;
• 100 gram increments.

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Month

This field indicates month of birth.

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Weekday

This field indicates whether the birth occurred on a weekend (Saturday or Sunday) or a weekday (Monday through Friday).

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Month Prenatal Care Began

This field indicates the month in the pregnancy when prenatal care began.

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Live Birth Order

This field indicates the mother's total number of live births, including this birth. Live birth order data are only included for data in the year 2003 and later.

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Birthplace

This field indicates the place of birth. Birthplace data are only included for data in the year 2003 and later. Birthplace categories for years 2003-2006:  In Hospital; Not in Hospital; Unknown or Not Stated. Additional birthplace categories are available for years 2007 and later:  In Hospital; Freestanding Birth Center; Clinic/Doctor's Office; Residence; Other; Unknown.

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Delivery Method

This field indicates whether the baby was born by Cesarean section or vaginal birth. Method of delivery data are only included for data in the year 2003 and later.

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Medical Attendant

This field indicates the attendant at the time of birth. Birth attendant data are only included for data in the year 2003 and later.

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Birth Anomalies

Note: Birth anomalies (congenital anomalies) data are no longer available in CDC WONDER, as of August 27, 2015. Previously, these data were available in CDC WONDER for births occurring in years 2007 - 2013. These data remain available in the NCHS public use data sets, at http://www.cdc.gov/nchs/data_access/VitalStatsOnline.htm#Births.

These fields were previously available for births in years 2007-2013. Birth anomaly data for New Mexico in 2007 were coded to "Not Reported."

1. Anencephalus Yes, No, Not Stated, Not Reported
2. Cleft Lip / Palate Yes, No, Not Stated, Not Reported
3. Down Syndrome Yes, No, Not Stated, Not Reported
4. Omphalocele / Gastroschisis Yes, No, Not Stated, Not Reported
5. Spina Bifida / Meningocele Yes, No, Not Stated, Not Reported



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Congenital Anomaly of the Newborn Codes
	Code	Label
	"1"	Yes
	"2"	No
	"9"	Not Stated
	"10"	Not Reported

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Anencephalus

See note under Birth Anomalies section above.

This field indicates whether Anencephalus is reported as a congenital anomaly of the newborn. Note that data for birth anomalies are only available for years 2007 and later.

How?     See How do I select items from the list box?.

Notes:   

• New Mexico has Anencephalus data coded to "Not Reported" for births that occurred in 2007.
• When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Congenital Anomaly of the Newborn Codes.

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Cleft Lip / Palate

See note under Birth Anomalies section above.

This field indicates whether Cleft Lip / Palate is reported as a congenital anomaly of the newborn. Note that data for birth anomalies are only available for years 2007 and later.

How?     See How do I select items from the list box?.

Notes:   

• New Mexico has Cleft Lip / Palate data coded to "Not Reported" for births that occurred in 2007.
• When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Congenital Anomaly of the Newborn Codes.

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Down Syndrome

See note under Birth Anomalies section above.

This field indicates whether Down Syndrome is reported as a congenital anomaly of the newborn. Note that data for birth anomalies are only available for years 2007 and later.

How?     See How do I select items from the list box?.

Notes:   

• New Mexico has Down Syndrome data coded to "Not Reported" for births that occurred in 2007.
• When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Congenital Anomaly of the Newborn Codes.

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Omphalocele / Gastroschisis

See note under Birth Anomalies section above.

This field indicates whether Omphalocele / Gastroschisis is reported as a congenital anomaly of the newborn. Note that data for birth anomalies are only available for years 2007 and later.

How?     See How do I select items from the list box?.

Notes:   

• New Mexico has Omphalocele / Gastroschisis data coded to "Not Reported" for births that occurred in 2007.
• When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Congenital Anomaly of the Newborn Codes.

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Spina Bifida / Meningocele

See note under Birth Anomalies section above.

This field indicates whether Spina Bifida / Meningocele is reported as a congenital anomaly of the newborn. Note that data for birth anomalies are only available for years 2007 and later.

How?     See How do I select items from the list box?.

Notes:   

• New Mexico has Spina Bifida / Meningocele data coded to "Not Reported" for births that occurred in 2007.
• When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Congenital Anomaly of the Newborn Codes.

Limit your data for any of the following data elements:

Available all years:

1. Chronic Hypertension - Yes; No; Not Stated; Not Reported.
2. Diabetes - Yes; No; Not Stated; Not Reported.
3. Pregnancy-associated Hypertension - Yes; No; Not Stated; Not Reported.
4. Eclampsia - Yes; No; Not Stated; Not Reported.
5. Tobacco Use - Yes; No; Not Stated; Not Reported.

Only available before year 2003:

1. Anemia - Yes; No; Not Stated; Not Reported.
2. Cardiac Disease - Yes; No; Not Stated; Not Reported.
3. Hydramnios/Oligohydramnios - Yes; No; Not Stated; Not Reported.
4. Incompetent cervix - Yes; No; Not Stated; Not Reported.
5. Lung disease (acute or chronic) - Yes; No; Not Stated; Not Reported.

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Maternal Risk Factor Codes and Labels
	Code	Label
	"1"	Yes
	"2"	No
	"9"	Not Stated
	"10"	Not Reported

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Chronic Hypertension Disease

This field indicates whether Chronic Hypertension Disease is reported as a maternal risk factor.

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Diabetes

This field indicates whether Diabetes is reported as a maternal risk factor.

The diabetes data for years 2007-2023 are "combined" to include data for mothers with any form of diabetes in general, as well as gestational diabetes. Reporting jurisdictions using the 1989 standard birth certificate report any form maternal diabetes in general, and data from reporting jurisdictions using the 2003 revised birth certificate are combined for chronic and gestational diabetes, to be comparable to the unrevised question.

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Pregnancy-associated Hypertension

This field indicates whether Pregnancy-associated Hypertension is reported as a maternal risk factor. This field reports whether a diagnosis occurred in this pregnancy of pregnancy-induced Hypertension or preeclampsia). Hypertension is defined as the elevation of blood pressure above normal for age, sex, and physiological condition. For more information, please refer to the How?     See How do I select items from the list box?.

Note:    When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

How?     See How do I select items from the list box?.

Notes:   

• Reporting areas with Eclampsia data coded to "Not Reported" by year of birth:
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2007: Idaho, Kentucky, Nebraska, Pennsylvania, South Carolina, Tennessee, and Washington (7 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2008: Idaho, Kentucky, Michigan, Nebraska, New York (only counties comprising New York City), Pennsylvania, South Carolina, Tennessee, and Washington (9 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2009: Idaho, Kentucky, Michigan, Nebraska, New York (only counties comprising New York City), Pennsylvania, South Carolina, Tennessee, and Washington (9 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2010: Idaho, Kentucky, Michigan, Nebraska, New York (only counties comprising New York City), Pennsylvania, South Carolina, Tennessee, and Washington (9 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2011: Idaho, Kentucky, Michigan, Nebraska, New York (only counties comprising New York City), Pennsylvania, South Carolina, Tennessee, and Washington (9 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2012: Idaho, Kentucky, Michigan, Nebraska, New York (only counties comprising New York City), Pennsylvania, South Carolina, Tennessee, and Washington (9 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2013: Idaho, Michigan, Nebraska, Pennsylvania, South Carolina, and Tennessee (6 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2014: Pennsylvania, South Carolina, and Tennessee (3 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2015: Pennsylvania, South Carolina, and Tennessee (3 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2016 - 2019: South Carolina, and Tennessee (2 reporting areas).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2020: South Carolina (1 reporting area).
  • The following reporting areas have Eclampsia data coded to "Not Reported" for births that occurred in 2021: South Carolina (1 reporting area).
• Please see the errata below for changes in the Eclampsia data for the New York city area births that occurred in 2008.
• When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

How?     See How do I select items from the list box?.

Notes:   

• All reporting areas, except California, routinely collect information on Maternal Tobacco Use, but information from the 2003 revision of the birth certificate, is not comparable to the information based on the earlier certificate. Thus Tobacco Use data are recoded, based on the form of birth certificate used by the mother's place of residence in the year of birth.
• In the reporting years 1995-2002, data for tobacco use during pregnancy are recoded for the state of California, because California did not require reporting this risk factor. Tobacco Use data for California are recoded in WONDER as "Not Stated" for births occurring in years 1995-2002. Prior to the February 2012 data update, these data were recoded as "Unknown."
• In the reporting years 2003-2006, data for tobacco use during pregnancy are recoded for several reporting areas, as noted below. Tobacco Use data for these reporting areas are recoded in WONDER as "Not Reported." California does not routinely collect Maternal Tobacco Use data. The other reporting areas listed have implemented the 2003 revised birth certificate, which collects smoking information differently and the data are not comparable to the data from the previous 1989 U.S. Standard Certificate of Live Birth. Prior to the February 2012 data update, these data were recoded as "Not on Certificate."
  • In reporting year 2003, maternal tobacco use data for 3 reporting areas, California, Pennsylvania and Washington state, have been recoded as "Not Reported."
  • In reporting year 2004, Maternal Tobacco Use data for 10 reporting areas, California, Florida, Idaho, Kentucky, New Hampshire, New York State (excluding New York City), Pennsylvania, South Carolina, Tennessee and Washington state, have been recoded as "Not Reported."
  • In reporting year 2005, Maternal Tobacco Use data for 14 reporting areas, California, Florida, Idaho, Kansas, Kentucky, Nebraska, New Hampshire, New York State (excluding New York City), Pennsylvania, South Carolina, Tennessee, Texas, Vermont and Washington state have been recoded as "Not Reported."
  • In reporting year 2006, Maternal Tobacco Use data for 19 reporting areas, California, Delaware, Florida, Idaho, Kansas, Kentucky, Nebraska, New Hampshire, New York (excluding New York City), North Dakota, Ohio, Pennsylvania, South Carolina, South Dakota, Tennessee, Texas, Vermont, Washington state and Wyoming, have been recoded as "Not Reported."
• In the reporting years 2007-2015, data have been recoded to "Not Reported" for births to mothers residing in a reporting area that used the 1989 U.S. Standard Certificate of Live Birth, or did not report Tobacco Use in the specified data year. Note the change from preceding years, which recoded data from the 2003 revision of the birth certificate.
  • In reporting year 2007, Maternal Tobacco Use data for 31 reporting areas, Alabama, Alaska, Arizona, Arkansas, Connecticut, District of Columbia reporting area, Florida, Georgia, Hawaii, Illinois, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Montana, Nevada, New Jersey, New Mexico, New York (New York City only), North Carolina, Oklahoma, Oregon, Rhode Island, Virginia, West Virginia, and Wisconsin have been recoded as "Not Reported."
  • In reporting year 2008, Maternal Tobacco Use data for 27 reporting areas, Alabama, Alaska, Arizona, Arkansas, Connecticut, District of Columbia reporting area, Florida, Georgia, Hawaii, Illinois, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nevada, New Jersey, North Carolina, Oklahoma, Rhode Island, Virginia, West Virginia, and Wisconsin have been recoded as "Not Reported."
  • In reporting year 2009, Maternal Tobacco Use data for 26 reporting areas, Alabama, Alaska, Arizona, Arkansas, Connecticut, District of Columbia reporting area, Florida, Georgia, Hawaii, Illinois, Louisiana, Maine, Maryland, Massachusetts, Michigan, Minnesota, Mississippi, Missouri, Nevada, New Jersey, North Carolina, Oklahoma, Rhode Island, Virginia, West Virginia, and Wisconsin have been recoded as "Not Reported."
  • In reporting year 2010, Maternal Tobacco Use data for 20 reporting areas, Alabama, Alaska, Arizona, Arkansas, Connecticut, Florida, Georgia, Hawaii, Louisiana, Maine, Massachusetts, Michigan, Minnesota, Mississippi, New Jersey, North Carolina, Rhode Island, Virginia, West Virginia, and Wisconsin have been recoded as "Not Reported."
  • In reporting year 2011, Maternal Tobacco Use data for 15 reporting areas, Alabama, Alaska, Arizona, Arkansas, Connecticut, Hawaii, Maine, Massachusetts, Michigan, Minnesota, Mississippi, New Jersey, Rhode Island, Virginia and West Virginia have been recoded as "Not Reported."
  • In reporting year 2012, Maternal Tobacco Use data for 13 reporting areas, Alabama, Alaska, Arizona, Arkansas, Connecticut, Hawaii, Maine, Michigan, Mississippi, New Jersey, Rhode Island, Virginia and West Virginia have been recoded as "Not Reported."
  • In reporting year 2013, Maternal Tobacco Use data for 10 reporting areas, Alabama, Arizona, Arkansas, Connecticut, Hawaii, Maine, Michigan, New Jersey, Rhode Island, and West Virginia have been recoded as "Not Reported."
  • In reporting year 2014, Maternal Tobacco Use data for 4 reporting areas, Connecticut, Hawaii, New Jersey, and Rhode Island have been recoded as "Not Reported."
  • In reporting year 2015, Maternal Tobacco Use data for 2 reporting areas, Connecticut and New Jersey have been recoded as "Not Reported."
• In reporting years 2016-2023, no Maternal Tobacco Use data have been recoded as "Not Reported." All reporting areas reported Tobacco Use data.
• When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

How?     See How do I select items from the list box?.

Note:    When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

How?     See How do I select items from the list box?.

Note:    When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

How?     See How do I select items from the list box?.

Note:    When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

How?     See How do I select items from the list box?.

Note:    When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

How?     See How do I select items from the list box?.

Note:    When you export the results of your data request, the labels and the codes are in separate columns. See the table showing Maternal Risk Factor Codes.

Export Results:		If checked, then query results are exported to a local file. More information on how to import this file into other applications can be found here. How?   See check box.
Show Totals:		If checked, then totals and sub-totals display in the results table. How?   See check box.
Show Zero Values:		If checked, then rows containing zero counts display in the results table. If unchecked, then zero count rows do not appear. How?   See check box.
Precision:		Select the number of positions after the decimal place for calculated measures such as rates, averages and percentages. How?   See check box.
Data Access Timeout:		This value specifies the maximum time to wait for the data access for a query to complete. If the data access takes too long to complete, a message will be displayed and you can increase the timeout or simplify your request. If you can't complete a request using the maximum timeout, contact user support and we will try to run a custom data request for you.

• Why are the data results sometimes very slow in returning?

  Some queries may take longer to run, such as 5-way tables or queries that sort through every record.

• Why are there no records found for a specific county?

  When viewing births sorted "by County," please note that not all counties in a given state show births that were registered in that county. The state total displays all tabulated births for a given state. Some counties are not associated with tabulated births due to confidentiality concerns. Counties with a total population less than 100,000 persons report births under "Unidentified Counties" to protect personal privacy. The label "Unidentified Counties" designates the combined counties with less than 100,000 population in the indicated state. 1995-2002 data show counties with a population of 100,000 persons or more in the year 1990 Census. 2003-2013 data show counties with a population of 100,000 persons or more in the year 2000 Census, and the 2014 data identify counties with a population of 100,000 persons or more in the year 2010 Census. There are 56 more counties named in the 2014 data than in the 2003-2013 data. There are 66 more counties identified in the 2003-2009 data than in the 1995-2002 data. If there are no records of births for a specific county, then request data for the entire state, grouped by County, to see the state total and the reporting counties for each state. See also Connecticut counties in 2022-2023.

• What data elements are available in the Natality data?

  Please see Natality Data Items for more information.

• What other technical notes for this data are available?

  Please see the following sources:

  • National Vital Statistics - Birth Data Vital Stats Online Downloadable Data Files

• What are the data privacy restrictions for Natality data?

  The following restrictions apply to Natality data due to data privacy policies:

  • Counties with a total population less than 100,000 persons report births under "Unidentified Counties" to protect personal privacy. The label "Unidentified Counties" designates the combined counties with less than 100,000 population in the indicated state. 1995-2002 data identify counties with a population of 100,000 persons or more in the year 1990 Census. 2003-2013 data identify counties with a population of 100,000 persons or more in the year 2000 Census. The 2014-2023 data identify counties with a population of 100,000 persons or more in the year 2010 Census. See also Connecticut counties in 2022-2023.
  • Sub-national data representing fewer than ten (one through nine) live births are suppressed.
  • For more information, see
    • Assurance of Confidentiality
    • CDC WONDER and NCHS data use restrictions

• What about data from the August 2004 release?

  The August 2004 release of the Natality Online database in CDC WONDER erroneously displayed the births by place of occurrence, instead of place of mother's legal residence, for the years 1999 - 2002. The Natality online database was taken off line November 12, 2004, and this problem was corrected with the February 2005 release. We apologize, and ask that any data obtained from the Natality online database August 2004 release (available on the internet from September 10, 2004 to November 12, 2004) for the years 1999, 2000, 2001 and 2002 is reviewed, or documented with a note stating that for the years 1999-2002, the birth counts report the county of birth place, rather than the county of mother's legal residence.

The FIPS state and county codes were established by the National Bureau of Standards, U.S. Department of Commerce in 1968. This standard set of codes provides names and codes for counties and county equivalents of the 50 states of the United States and the District of Columbia reporting area. Counties are considered to be the "first order subdivisions" of each State, regardless of their local designation (county, parish, borough). Washington, D.C.; the consolidated government of Columbus, Georgia; the independent cities of the States of Maryland, Missouri, Nevada, and Virginia; the census areas and boroughs of Alaska; and that part of Yellowstone Park in Montana are identified as county equivalents. The system is standard throughout the Federal Government. The State codes are ascending, two-digit numbers; the county codes are ascending three-digit numbers. For both the State and county codes, space has been left for new States or counties. Some changes in the FIPS codes have occurred since 1968.

A modified version of the FIPS state and county codes is used to identify states and counties on NCHS public-use data files. The modifications as implemented in the Natality public-use data are described below.

Modifications of FIPS State and County Codes

1. Counties with populations under 100,000 persons are grouped into "Unidentified Counties" (FIPS code 999) to protect privacy.
   • 1995-2002 data shows counties with a population of 100,000 persons or more in the year 1990 Census.
   • 2003-2013 data shows counties with a population of 100,000 persons or more in the year 2000 Census. There are 66 more counties in the 2003-2013 data than in the 1995-2002 data.
   • The 2014-2020 data shows counties with a population of 100,000 persons or more in the year 2010 Census. There are 56 more counties identified in the 2014 data than in the 2003-2013 data. The following counties are identified in 2014, although recoded as "Unidentified Counties" before 2014 because these counties did not meet minimum population standards in the 2000 Census: Houston County, AL (01069); Navajo County, AZ (04017); Faulkner County, AR (05045); Saline County, AR (05125); Bartow County, GA (13015); Carroll County, GA (13045); Columbia County, GA (13073); Coweta County, GA (13077); Douglas County, GA (13097); Fayette County, GA (13113); Forsyth County, GA (13117); Lowndes County, GA (13185); Paulding County, GA (13223); Whitfield County, GA (13313); Bonneville County, ID (16019); DeKalb County, IL (17037); Kendall County, IL (17093); Clark County, IN (18019); Douglas County, KS (20045); Boone County, KY (21015); Hardin County, KY (21093); Warren County, KY (21227); Ascension Parish, LA (22005); Bossier Parish, LA (22015); Livingston Parish, LA (22063); Cecil County, MD (24015); St. Mary's County, MD (24037); Scott County, MN (27139); Wright County, MN (27171); Franklin County, MO (29071); Missoula County, MT (30063); Sandoval County, NM (35043); Tompkins County, NY (36109); Brunswick County, NC (37019); Craven County, NC (37049); Harnett County, NC (37085); Henderson County, NC (37089); Miami County, OH (39109); Canadian County, OK (40017); Adams County, PA (42001); Dorchester County, SC (45035); Pennington County, SD (46103); Wilson County, TN (47189); Comal County, TX (48091); Guadalupe County, TX (48187); Hays County, TX (48209); Kaufman County, TX (48257); Parker County, TX (48367); Cache County, UT (49005); Washington County, UT (49053); Spotsylvania County, VA (51177); Stafford County, VA (51179); Cowlitz County, WA (53015); Berkeley County, WV (54003); Fond du Lac County, WI (55039); Walworth County, WI (55127).
   • After 2013, births data for the following two counties were recoded to the "Unidentified Counties" category within the state, because these counties did not meet minimum population standards: Cape May County, NJ (34009); Portsmouth city, VA (51740).
2. Data for some counties in New York and Virginia have been revised for 2014 births based on updated residence population. More information.
3. Data for some counties in Maryland and New York have been revised for 2009 births based on updated residence population. More information.
4. A portion of Adams county, Colorado (FIPS code 08001) was moved into Broomfield County, Colorado (FIPS code 08014), which was created effective November 15, 2001 from parts of four counties: Adams, Boulder, Jefferson, and Weld. However, this new county does not appear on this file.
5. A portion of Boulder county, Colorado was moved into Broomfield County, Colorado (FIPS code 08014), which was created effective November 15, 2001 from parts of four counties: Adams, Boulder, Jefferson, and Weld. However, this new county does not appear on this file.
6. A portion of Weld county, Colorado was moved into Broomfield County, Colorado (FIPS code 08014), which was created effective November 15, 2001 from parts of four counties: Adams, Boulder, Jefferson, and Weld. However, this new county does not appear on this file.
7. Connecticut reports births for 8 legacy counties, yet population estimates for rate calculations are not available for the 8 legacy counties in 2022-2023. Population estimates aggregated for the 9 county-equivalant planning areas are reported in the "Unidentified Counties" category in Connecticut (FIPS code 09999). See Connecticut counties in 2022-2023.
8. Dade county, Florida (FIPS code 12025) was renamed Miami-Dade County (FIPS code 12086) effective November 13, 1997. However, the area is coded to Dade (12025) for all years.
9. The independent city of Baltimore, Maryland (FIPS code 24510) is reported separately from Baltimore county (FIPS code 24005).
10. The independent city of St. Lois, Missouri (FIPS code 29510) is reported separately from St. Louis county (FIPS code 29189).
11. Bronx, New York (FIPS code 36005) represents Bronx Borough, New York City.
12. Kings county, New York (FIPS code 36047) represents Brooklyn Borough, New York City.
13. New York county, New York (FIPS code 36061) represents Manhattan Borough, New York City.
14. Queens, New York (FIPS code 36081) represents Queens Borough, New York City.
15. Richmond county, New York (FIPS code 36085) represents Staten Island Borough, New York City.