BIRTHS

Statistical Overview

There were 115,542 live births to New Jersey residents in 2000.  This number represents a 1.5 percent increase over the number in 1999 (Table N1 and Figure N1).  Age-specific birth rates among mothers under age 30 were substantially lower than in 1970, 1980, and 1990 while rates for mothers 30 and over were considerably higher (Table N4).  Multiple births as a share of all births were down from 1999, though the percentage remained well above the level ten years earlier (3.9% and 2.3%, respectively) (Table N9 and Figure N4).  Older mothers and white non-Hispanic mothers had the highest rates of multiple births (Table N10).  The cesarean delivery rate continued to increase (to 26.5%) and the rate of vaginal birth after a previous cesarean continued to decline (to 26.7%) after peaking in 1996 (Table N15 and Figure N6).  Cesarean rates are positively correlated with age of mother (Table N17). 

Maternal Characteristics and Medical Services Utilization

The median age of women who gave birth in 2000 was 30.3 (Table N28); 48.2 percent of mothers were under age 30 and 51.8 percent were 30 and over (Table N18 and Figure N8).  The number and percent of births to teens continued a long decline (to 8,152 births or 7.1% of the total number of births) that has lasted more than three decades.  Conversely, the number and percent of births to women 35 and over continued to rise, increasing to 23,719 births (20.5% of all births) (Table N19 and Figure N9).  White non-Hispanic women accounted for 53.8 percent of births; 19.1 percent were to Hispanic women of any race; 16.2 percent to black non-Hispanic women; and 7.7 percent were to Asian and Pacific Islander non-Hispanic women (Table N22 and Figure N7).  For 28.7 percent of women giving birth in 2000, this was their first pregnancy (Table N25); for 41.0 percent this was their first live birth and for 33.0 percent this was their second (Table N27 and Figure N12).  The median age of women giving birth to their first child was 27.8 (Table N28).  The proportion of births occurring to unmarried mothers increased slightly to 28.5 percent (Table N29 and Figure N13).  For women under 25 years of age, Hispanics, and non-Hispanic blacks, more than half of births in 2000 occurred to unmarried women (Table N30). 

Nearly three-quarters of women received prenatal care in the first trimester of pregnancy, while only 1.2 percent did not receive care at all (Table N35 and Figure N14).  Older mothers, white or Asian/Pacific Islander non-Hispanic mothers, married mothers, mothers with higher levels of education, and US-born mothers were more likely to receive early prenatal care while younger mothers, black non-Hispanic mothers, unmarried mothers, and less educated mothers were more likely to not receive any care (Tables N37-N39, N41).  On average, women received 10.8 prenatal care visits in 2000. 

Over nine percent of births were preterm (fewer than 37 weeks of gestation).  Prematurely born infants were disproportionately likely to be part of a multiple birth and were more likely than average to be underweight (less than 2,500 grams) (Table N42). 

In 2000, 9.5 percent of mothers reported that they smoked during pregnancy, 1.3 percent drank alcohol, and 1.7 percent used other drugs (Tables N43-N45 and Figure N16).  Diabetes was the most frequently reported medical risk factor among mothers delivering in 2000 (4.0%).  Among teen mothers and black non-Hispanic mothers, sexually transmitted diseases were the most common risk.  Nearly 60 percent of women delivering in 2000 reported no medical risk factors (Table N46).  Over 90 percent of mothers had electronic fetal monitoring and ultrasound performed (Table N47 and Figure N17).  Over 50 percent had some complication of labor and/or delivery reported.  Moderate or heavy meconium (6.9%) and fetal distress (6.6%) were the most common complications in each age group and in each race/ethnicity group (Table N48). 

Newborn Health

In 2000, 7.5 percent of infants were of low birth weight (less than 2,500 grams at birth).  While the low birth weight percentages among white non-Hispanic, Hispanic, and Asian and Pacific Islander non-Hispanic infants were below the overall percentage (6.2%, 7.3%, and 7.2%, respectively), 13.2 percent of black non-Hispanic infants weighed less than 2,500 grams at birth (Table N49 and Figure N19).  Low birth weights occurred most frequently among the youngest and the oldest mothers, while mothers aged 25-34 had the lowest rates (Table N49 and Figure N18).  Low birth weight was highly correlated with plurality.  While only 5.7 percent of singletons were of low birth weight, 53.1 percent of multiple births weighed less than 2,500 grams (Table N53 and Figure N21).  The likelihood of low birth weight also increased with the number of previous pregnancy terminations and with a lack of prenatal care (Tables N52 & N54 and Figures N20 & N22).

More than 94 percent of infants received five-minute Apgar scores of seven or higher.  Mothers who did not receive prenatal care had the highest rates of low (0-6) Apgar scores (Table N56).  Over 80 percent of newborns had no abnormal conditions reported.  Assisted ventilation of 30 minutes or more was the most frequently reported abnormal condition among newborns in 2000 (Table N57).  There were no congenital anomalies reported on 92.6 percent of birth certificates (Table N58), however New Jersey maintains a separate Birth Defects Registry that may more accurately reflect the population of newborns and children with congenital anomalies. 

The Technical Notes section contains information on sources of data, allocation of data by residence or occurrence, quality of data, racial and ethnic classification, definitions, and rates and ratios.

LIVE BIRTH DATA TABLES
Table N1	Births and Birth Rates, New Jersey and United States, 1980-2000
Table N2	Births and Birth Rates by County of Residence
Table N3	Births to Residents of Selected Municipalities
Table N4	Fertility and Age-Specific Birth Rates
Table N5	Births by Month and Day of Week
Table N6	Sex of Child by County of Residence
Table N7	Sex of Child for Selected Municipalities
Table N8	Sex of Child by Race/Ethnicity of Mother
Table N9	Plurality, 1990-2000
Table N10	Plurality by Age and Race/Ethnicity of Mother
Table N11	Births by Attendant, 1990-2000
Table N12	Attendant by Age and Race/Ethnicity of Mother
Table N13	Attendant by County of Residence
Table N14	Births by Place, 1990-2000
Table N15	Method of Delivery and VBAC Rate, 1990-2000
Table N16	Births by Method of Delivery
Table N17	Method of Delivery by Age and Race/Ethnicity of Mother
Table N18	Births by Age and Race/Ethnicity of Mother
Table N19	Births to Women in Selected Age Groups, 1980-2000
Table N20	Births by Age and County of Residence
Table N20A	Teen Birth Rates by County of Residence
Table N21	Births by Age for Selected Municipalities
Table N21A	Teen Birth Rates for Selected Municipalities
Table N22	Births by Detailed Race/Ethnicity Groups and Hispanic Country of Origin
Table N23	Births by Race/Ethnicity and County of Residence
Table N24	Births by Race/Ethnicity for Selected Municipalities
Table N25	Previous Pregnancy History by Age of Mother
Table N26	First Birth Rate by Age and Race/Ethnicity of Mother
Table N27	Live-Birth Order by Age and Race/Ethnicity of Mother
Table N28	Median Age of Mother by Race/Ethnicity
Table N29	Births by Marital Status, 1980-2000
Table N30	Births by Marital Status and Detailed Age and Race/Ethnicity
Table N31	Births by Age, Race/Ethnicity, and Marital Status
Table N32	Births by Marital Status and County of Residence
Table N33	Births by Marital Status for Selected Municipalities
Table N34	Maternal Weight Gain by Gestation and Birth Weight
Table N35	Onset of Prenatal Care by County of Residence
Table N36	Onset of Prenatal Care for Selected Municipalities
Table N37	Births by Race/Ethnicity and Age of Mother and Onset of Prenatal Care
Table N38	Births by Marital Status and Age of Mother and Onset of Prenatal Care
Table N39	Births by Mother's Education and Onset of Prenatal Care
Table N40	Number of Prenatal Visits by Race/Ethnicity and Onset of Prenatal Care
Table N41	Selected Birth Outcomes by Birthplace and Race/Ethnicity of Mother
Table N42	Gestation by Race/Ethnicity, Plurality, and Birth Weight
Table N43	Smoking by Age and Race/Ethnicity
Table N44	Drinking by Age and Race/Ethnicity
Table N45	Drug Use by Age and Race/Ethnicity
Table N46	Medical Risk Factors by Age and Race/Ethnicity of Mother
Table N47	Obstetric Procedures Performed by Age and Race/Ethnicity of Mother
Table N48	Complications of Labor and/or Delivery by Age and Race/Ethnicity of Mother
Table N49	Birth Weight by Age and Race/Ethnicity of Mother
Table N50	Birth Weight by County of Residence
Table N51	Birth Weight for Selected Municipalities
Table N52	Birth Weight by Number of Previous Pregnancy Terminations
Table N53	Birth Weight by Plurality
Table N54	Birth Weight by Onset of Prenatal Care and Race/Ethnicity of Mother
Table N55	Detailed Birth Weights
Table N56	Five-minute Apgar Score by Race/Ethnicity and Age of Mother and Onset of Prenatal Care
Table N57	Abnormal Conditions of Newborn by Age and Race/Ethnicity of Mother
Table N58	Congenital Anomalies of Newborn by Age and Race/Ethnicity of Mother
LIVE BIRTH ILLUSTRATIONS
Figure N1	Births, New Jersey, 1980-2000
Figure N2	Birth Rates, New Jersey and the United States, 1980-2000
Figure N3	Birth Rates by County
Figure N4	Multiple Births, 1990-2000
Figure N5	Attendant at Birth, 1990-2000
Figure N6	Rate of Vaginal Birth After Previous Cesarean Section, 1990-2000
Figure N7	Race/Ethnicity of Mother
Figure N8	Age of Mother
Figure N9	Births to Women Under 20 and Women 35 and Over, 1980-2000
Figure N10	Percentage of Births to Teens by County
Figure N11	Teen Birth Rates by County
Figure N12	Birth Order
Figure N13	Unmarried Mothers, 1980-2000
Figure N13A	Percent of Births to Unmarried Mothers by County
Figure N13B	First Trimester Prenatal Care Percentage by County
Figure N14	Prenatal Care Onset
Figure N15	Low Birth Weight by Weeks of Gestation
Figure N16	Smoking, Drinking, and Drug Use During Pregnancy
Figure N17	Obstetric Procedures Performed
Figure N18	Low Birth Weight by Age of Mother
Figure N19	Low Birth Weight by Race/Ethnicity of Mother
Figure N19A	Low Birth Weight Percentage by County
Figure N20	Low Birth Weight by Number of Previous Pregnancy Terminations
Figure N21	Low Birth Weight by Plurality
Figure N22	Low Birth Weight by Onset of Prenatal Care