| Dichotomous outcomes at 1 year | |||||
|---|---|---|---|---|---|
| Study | Outcome | Site | Intervention % (reported) | Control % (reported) | P value (reported) |
| Chewning 1999 | Pregnancy | Chicago | 24.5 | 27.3 | NS |
| Chewning 1999 | Pregnancy | Madison | 3.6 | 8.6 | 0.074 |
| Chewning 1999 | No OC use | Chicago | 3.4 | 8.8 | 0.05 |
| Chewning 1999 | No OC use | Madison | 1.2 | 2.3 | NS |
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