Abma Joyce C, Martinez Gladys M, Copen Casey E
Division of Vital Statistics, Centers for Control and Prevention, National Center for Health Statistics, Hyattsville, MD 20782, USA.
Vital Health Stat 23. 2010 Jun(30):1-47.
This report presents national estimates of sexual activity, contraceptive use, and births among males and females 15-19 years of age in the United States in 2006-2008 from the National Survey of Family Growth (NSFG). Selected data are also presented from the 1988, 1995, and 2002 NSFGs, and from the 1988 and 1995 National Survey of Adolescent Males (NSAM), conducted by the Urban Institute.
Descriptive tables of numbers and percents are presented and discussed. Data were collected through in-person interviews of the household population in the United States, conducted between July 2006 and December 2008. Interviews were conducted with 7,356 females-1,381 of whom were teenagers--and 6,140 males--1,386 of whom were teenagers-for a total of 2,767 teenagers. The overall response rate for the 2006-2008 NSFG was 75%. The response rate for female teenagers was 77% and for male teenagers 75%.
In 2006-2008, about 42% of never-married female teenagers (4.3 million), and about 43% of never-married male teenagers (4.5 million) had had sexual intercourse at least once. These levels of sexual experience have not changed significantly from 2002, the last time the NSFG collected these data. Among never-married teenagers, 79% of females and 87% of males used a method of contraception at first sex. With a few exceptions, teenagers' use of contraceptives has changed little since 2002, and the condom remained the most commonly used method. One exception was an increase in the use of condoms and the use of a condom combined with a hormonal contraceptive (dual method use) among males. Another exception was a significant increase in the percent of female teenagers who had ever used periodic abstinence, or the "calendar rhythm" method. This method had been used by 17% of female teenagers in 2006-2008.
本报告展示了2006 - 2008年美国国家家庭成长调查（NSFG）对15 - 19岁男性和女性的性活动、避孕措施使用情况及生育情况的全国性估计。还呈现了1988年、1995年和2002年NSFG以及城市研究所进行的1988年和1995年全国青少年男性调查（NSAM）中的部分选定数据。
给出并讨论了数字和百分比的描述性表格。数据通过2006年7月至2008年12月期间对美国家庭人口进行的面对面访谈收集。共对7356名女性（其中1381名是青少年）和6140名男性（其中1386名是青少年）进行了访谈，青少年总数为2767名。2006 - 2008年NSFG的总体回应率为75%。女性青少年的回应率为77%，男性青少年为75%。
在2006 - 2008年，约42%的未婚女性青少年（430万）和约43%的未婚男性青少年（450万）至少有过一次性行为。这些性经历水平自2002年NSFG上次收集这些数据以来没有显著变化。在未婚青少年中，79%的女性和87%的男性在首次性行为时使用了避孕方法。自2002年以来，除了少数例外情况，青少年对避孕措施的使用变化不大，避孕套仍然是最常用的方法。一个例外是男性中避孕套的使用以及避孕套与激素避孕方法联合使用（双重方法使用）有所增加。另一个例外是曾经使用过定期禁欲或“安全期”方法的女性青少年比例显著增加。2006 - 2008年有17%的女性青少年使用过这种方法。
