Contraceptive method at first sexual intercourse and subsequent pregnancy risk: findings from a secondary analysis of 16-year-old girls from the RIPPLE and SHARE studies.
Contraceptive method at first sexual intercourse and subsequent pregnancy risk: findings from a secondary analysis of 16-year-old girls from the RIPPLE and SHARE studies.
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DOI：
10.1016/j.jadohealth.2008.06.006
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发表时间：
2009-01
影响因子：
7.6
通讯作者：
Strange, Vicki
中科院分区：
文献类型：
--
作者：
Parkes, Alison;Wight, Daniel;Henderson, Marion;Stephenson, Judith;Strange, Vicki
现有的失败率研究表明，典型地使用口服避孕药(OC)导致的意外怀孕比使用避孕套少，即使在青少年中也是如此。然而，对于开始第一次性关系的年轻青少年来说，缺乏与不同避孕方法相关的怀孕风险的比较数据。这项研究调查了16岁女孩第一次性交时的避孕方法与随后怀孕的关系。来自51所中学的6,348名女学生完成了一份调查问卷，平均年龄为16岁；2 501名女孩报告发生了性行为。采用Logistic回归分析(N=1952)对首次性交避孕方法与妊娠的关系进行建模。第一次性交(中位年龄15岁)，54%的人报告只使用避孕套，11%的人使用双重避孕套和避孕套，4%的人只使用避孕套，4%的人使用紧急避孕措施，21%的人没有有效的方法。在最近的一次性交中，使用的方法与类似的方法有关。每10个女孩中就有一个报告怀孕。与仅使用避孕套相比，没有有效的方法(优势比[OR]2.97，95%可信区间[CI]2.12-4.15)或仅使用避孕套(OC)(OR 2.44，95%可信区间1.29-4.60)的孕妇怀孕风险更高。双重用途和紧急避孕的怀孕风险与仅使用避孕套的风险没有区别。通过对用户特征和性行为进行调整，这两种显著影响都被部分减弱。青少年在避孕方面使用OC的效果可能不如避孕套。那些只使用OC的人的特征证实了意外怀孕的易感性，并建议应该为这些年轻女性考虑替代避孕策略。
Existing failure rate studies indicate that typical use of oral contraception (OC) results in fewer unplanned pregnancies than condom use, even among teenagers. However, comparative data on pregnancy risk associated with different contraceptive methods are lacking for younger teenagers starting their first sexual relationship. This study examined associations between contraceptive method at first intercourse and subsequent pregnancy in 16-year-old girls. Six thousand three hundred forty-eight female pupils from 51 secondary schools completed a questionnaire at mean age 16 years; 2,501 girls reported sexual intercourse. Logistic regression (N = 1952) was used to model the association of contraceptive method at first intercourse with pregnancy. At first intercourse (median age 15 years) 54% reported using condoms only, 11% dual OC and condoms, 4% OC only, 4% emergency contraception, and 21% no effective method. Method used was associated with a similar method at a most recent intercourse. One in 10 girls reported a pregnancy. When compared to use of condoms only, greater pregnancy risk was found with no effective method (odds ratio [OR] 2.97, 95% confidence interval [CI] 2.12–4.15) or OC only (OR 2.44, 95% CI 1.29–4.60). Pregnancy risk for dual use and emergency contraception did not differ from that for condoms only. Both significant effects were partially attenuated by adjusting for user characteristics and sexual activity. Young teenagers may use OC less efficiently than condoms for pregnancy prevention. The characteristics of those using OC-only confirm vulnerability to unintended pregnancy, and suggest that alternative contraceptive strategies should be considered for these young women.
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影响因子：
4.4
作者：
Imamura, Mari;Tucker, Janet;Temmerman, Marleen
通讯作者：
Temmerman, Marleen
影响因子：
7.6
作者：
DURANT, RH;JAY, MS;LITT, I
通讯作者：
LITT, I
DOI：
10.1783/jfp.31.2.271
发表时间：
2005-10-01
影响因子：
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作者：
Parkes, A;Henderson, M;Wight, D
通讯作者：
Wight, D
DOI：
10.3109/13625189909040806
发表时间：
1999-01-01
影响因子：
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作者：
Rajasekar, D.;Bigrigg, A.;Docherty, G.
通讯作者：
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影响因子：
5.8
作者：
Jones, RK;Darroch, JE;Henshaw, SK
通讯作者：
Henshaw, SK