Primary prevention strategy v control (alternate intervention or nothing) for adolescents*
| 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. | ||||
| Women | ||||
| 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) |
| Men | ||||
| 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)§ |