Births: final data for 1999.

摘要: OBJECTIVES This report presents 1999 data on U.S. births according to a wide variety of characteristics. Data are presented for maternal demographic characteristics including age, live-birth order, race, Hispanic origin, marital status, and educational attainment; (medical risk factors, weight gain, tobacco alcohol use); medical care utilization by pregnant women (prenatal care, obstetric procedures, complications labor and/or delivery, attendant at birth, method delivery); infant (period gestation, birthweight, Apgar score, abnormal conditions, congenital anomalies, multiple births). Also birth fertility rates status. Selected mother's State residence shown, as well month day sex ratio, age father. Trends in patterns described interpreted. METHODS Descriptive tabulations reported the certificates 3.96 million that occurred presented. RESULTS Overall changed less than 1 percent 1999. Teenage fell 2 6 percent. The rate aged 20-24 years declined slightly, while their late twenties thirties rose 3 each. number unmarried women, rate, were each or less. Smoking overall dropped again, but among 18-24 years. Improvements prenatal continued. cesarean delivery increased third year after declining 7 consecutive proportion continued rise; however, higher order (e.g., triplets, quadruplets) first time over decade, following increases 13 per during 1990-98. low birthweight remained 7.6 percent, preterm 11.8 These trends large part result births.