| Consistency of hormonal contraceptive use | ||
|---|---|---|
| Study | Assessment | Reported adjusted relative risk (95% CI) |
| Sieving 2013 | 12 months | 1.46 (1.13 to 1.89) |
| Sieving 2013 | 18 months | 1.36 (1.02 to 1.83) |
| Sieving 2013 | 24 months | 1.30 (1.06 to 1.58) |
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