Hamilton Brady E, Martin Joyce A, Sutton Paul D
U.S. Department of Health and Human Services, Centers for Disease Control and Prevention, National Center for Health Statistics, Division of Vital Statistics, Hyattsville, Maryland 20782, USA.
Natl Vital Stat Rep. 2003 Jun 25;51(11):1-20.
This report presents preliminary data for 2002 on births in the United States. U.S. data on births are shown by age, race, and Hispanic origin of mother. Data on marital status, prenatal care, cesarean delivery, preterm births, and low birthweight are also presented.
Data in this report are based on nearly 98 percent of births for 2002. The records are weighted to independent control counts of all births received in State vital statistics offices in 2002. Comparisons are made with 2001 final data.
The crude birth rate was 13.9 per 1,000 population in 2002, a decrease of 1 percent from 2001 (14.1). This is the lowest birth rate reported for the United States since national data have been available. The fertility rate was also down 1 percent in 2002 to 64.8 births per 1,000 women aged 15-44 years. Since 1990, this rate has declined 9 percent. The birth rate for teenagers continued to decline in 2002, dropping 5 percent to 42.9 births per 1,000 women aged 15-19 years. The teenage birth rate has dropped 28 percent since 1990. The rate for younger teenagers 15-17 years fell 6 percent from 24.7 per 1,000 in 2001 to 23.2 in 2002. The rate for older teenagers 18-19 years declined 4 percent from 76.1 per 1,000 in 2001 to 72.7 in 2002. Since 1990, the rate for teenagers 15-17 years has fallen 38 percent and the rate for teenagers 18-19 years, 18 percent. The birth rate for women aged 20-24 years declined by 3 percent to 103.5 per 1,000 in 2002 compared with 2001, whereas the rate for women aged 25-29 years was essentially unchanged (113.6). The birth rate for women aged 30-34 years decreased slightly from 91.9 per 1,000 in 2001 to 91.6 in 2002. Birth rates for women aged 35-39 years and 40-44 years continued to rise, increasing 2 percent for both. Childbearing among women over 45 years of age was unchanged. The birth rate for unmarried women was down slightly in 2002 to 43.6 births per 1,000 unmarried women aged 15-44 years. The number of births to unmarried women increased by 1 percent in 2002; however births to unmarried teenagers declined by 4 percent. Prenatal care utilization continued to slowly but steadily improve; 83.8 percent of women began prenatal care in the first trimester of pregnancy in 2002 compared with 83.4 in 2001. More than one fourth of all births (26.1 percent) were cesarean deliveries in 2002, the highest rate ever reported in the United States; the primary cesarean rate jumped 7 percent to 18 percent and the rate of vaginal births after previous cesarean delivery plummeted 23 percent to 12.7 percent (figure 1). Preterm (12.0 percent) and low birthweight (7.8 percent) rates were up slightly for 2002. The low birthweight rate is the highest reported in more than three decades.
本报告展示了2002年美国出生情况的初步数据。美国的出生数据按母亲的年龄、种族和西班牙裔血统进行展示。还呈现了婚姻状况、产前护理、剖宫产、早产和低体重儿的数据。
本报告中的数据基于2002年近98%的出生记录。这些记录经过加权处理,以独立对照2002年各州生命统计办公室收到的所有出生记录。与2001年的最终数据进行了比较。
2002年粗出生率为每1000人口13.9例,比2001年(14.1)下降了1%。这是有全国数据以来美国报告的最低出生率。2002年生育率也下降了1%,降至每1000名15 - 44岁女性64.8例出生。自1990年以来,该比率下降了9%。2002年青少年出生率继续下降,降至每1000名15 - 19岁女性42.9例出生,下降了5%。自1990年以来,青少年出生率下降了28%。15 - 17岁较年轻青少年的比率从2001年的每1000人24.7例下降6%至2002年的23.2例。18 - 19岁较年长青少年的比率从2001年的每1000人76.1例下降4%至2002年的72.7例。自1990年以来,15 - 17岁青少年的比率下降了38%,18 - 19岁青少年的比率下降了18%。2002年20 - 24岁女性的出生率与2001年相比下降了3%,降至每1000人103.5例,而25 - 29岁女性的比率基本未变(113.6)。30 - 34岁女性的出生率从2001年的每1000人91.9例略有下降至2002年的91.6例。35 - 39岁和40 - 44岁女性的出生率继续上升,两者均上升了2%。45岁以上女性的生育情况未变。2002年未婚女性的出生率略有下降,降至每1000名15 - 44岁未婚女性43.6例出生。2002年未婚女性的生育数量增加了1%;然而,未婚青少年的生育数量下降了4%。产前护理利用率继续缓慢但稳步提高;2002年83.8%的女性在怀孕的头三个月开始接受产前护理,而2001年为83.4%。2002年超过四分之一(26.1%)的分娩为剖宫产,这是美国有史以来报告的最高比率;首次剖宫产率跃升7%至18%,既往剖宫产术后阴道分娩率暴跌23%至12.7%(图1)。2002年早产率(12.0%)和低体重儿率(7.8%)略有上升。低体重儿率是三十多年来报告的最高水平。