Department of Psychiatry, Washington University School of Medicine, Campus Box 8134, St. Louis, MO 63110, USA.
Contraception. 2010 Dec;82(6):549-55. doi: 10.1016/j.contraception.2010.05.007. Epub 2010 Jun 17.
This study was conducted to examine associations with contraception methods used at last sexual intercourse among US adolescents.
Data consisted of sexually active adolescents (9th-12th grade, weighted n=24,638) from the 1999-2007 Youth Risk Behavior Surveillance System (YRBSS). We performed multinomial multivariable logistic regression analyses with condom users at last sexual intercourse as the reference group.
Males who used alcohol, cigarettes, marijuana and cocaine were more likely to use no method/unsure of method (OR=2.4, CI=1.7-3.4) or rely on withdrawal (OR=2.6, CI=1.5-4.3). Females with six or more sexual partners were more likely to rely on withdrawal (OR=2.9, CI=2.1-3.9) or contraception methods that offer no STI protection [i.e., birth control pills: OR=1.9, CI=1.4-2.5; and depot medroxyprogesterone acetate (DMPA, marketed as Depo-Provera): OR=2.6, CI=1.6-4.2]. Earlier age of sexual debut was also associated with nonuse.
Prevention efforts should focus on at-risk adolescents including substance-using males, females with six or more sexual partners, and those who initiate sexual intercourse at an early age.
本研究旨在探讨美国青少年最近一次性行为中使用避孕方法的关联因素。
数据来自于 1999-2007 年的青少年风险行为监测系统（YRBSS）中活跃的性青少年（9 至 12 年级，加权 n=24638）。我们对最近一次性行为中使用安全套的人进行了多项多变量逻辑回归分析，以作为参考组。
最近一次性行为中使用酒精、香烟、大麻和可卡因的男性更有可能使用无保护措施/不确定方法（OR=2.4，CI=1.7-3.4）或依赖体外排精（OR=2.6，CI=1.5-4.3）。有六个或更多性伴侣的女性更有可能依赖体外排精（OR=2.9，CI=2.1-3.9）或使用不提供性病保护的避孕方法[即避孕药：OR=1.9，CI=1.4-2.5；和 depot 醋酸甲羟孕酮（DMPA，以 Depo-Provera 销售）：OR=2.6，CI=1.6-4.2]。性开始的年龄较早也与不使用避孕方法有关。
预防工作应重点关注高危青少年，包括使用药物的男性、有六个或更多性伴侣的女性，以及较早开始性行为的青少年。
