|Weighted event rates|
|Outcomes||Number of trials||Primary prevention||Control||Pooled odds ratio (OR) (95% CI)†|
|*Abbreviations defined in glossary. Weighted event rates provided by author. Follow up ranged from 2–54 months. †For intercourse and pregnancy outcomes, OR <1.0 favours intervention; for contraception outcomes, OR >1 favours intervention. ‡Significant heterogeneity among trials. §Statistically significant.|
|Delayed initiation of intercourse||13 (n=9642)||22%||20%||1.12 (0.96 to 1.30)|
|Used contraception at every intercourse||8 (n=1967)||45%||44%||0.95 (0.69 to 1.30)|
|Used contraception at last intercourse||5 (n=799)||50%||46%||1.05 (0.50 to 2.19)‡|
|Pregnancy||12 (n=8019)||4.4%||4.8%||1.04 (0.78 to 1.40)|
|Delayed initiation of intercourse||11 (n=7418)||29%||30%||0.99 (0.84 to 1.16)|
|Used contraception at every intercourse||3 (n=1505)||36%||38%||0.90 (0.70 to 1.16)|
|Used contraception at last intercourse||4 (n=1262)||69%||64%||1.25 (0.99 to 1.59)|
|Pregnancy in partners||5 (n=3759)||3.4%||2.4%||1.54 (1.03 to 2.29)§|
Review: primary prevention strategies do not delay initiation of intercourse, improve contraceptive use, or reduce pregnancies in adolescent women
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