Summary of pregnancy outcomes
| Pregnancy outcome | # effect sizes | RR | 95% CI | P value (RR) | Q statistic | P value (Q) | I-squared |
| Pregnancy (clinical and self-reported) | 3 RCTs | 1.36 | 1.07 to 1.73 | 0.01 | 0.43 | 0.81 | 0.00 |
| Pregnancy (clinical only) | 1 RCT | 1.09 | 0.51 to 2.32 | 0.85 | – | – | – |
| Pregnancy (self-reported only) | 2 RCTs | 1.40 | 1.08 to 1.80 | 0.01 | 0.06 | 0.81 | 0.00 |
| Pregnancy (clinical only) | 1 observational | 0.35 | 0.15 to 0.86 | 0.01 | – | – | – |
OPK, ovulation predictor kit; RCT, randomised controlled trial; RR, risk ratio comparing using OPKs to not using OPKs for fertility management.