| Methods | Women 'randomly allocated' to 2 groups. Method of randomisation not reported | |
| Participants | 160 women attending the family planning service site, Anhui, China. Women had regular menstrual periods and a single act of unprotected intercourse within 120 h of attending the service site | |
| Interventions | Mife 25 mg, single dose, orally vs LNG 0.75 mg, 2 doses, 12 h apart | |
| Outcomes | Observed number of pregnancies, side effects and changes in menstrual pattern | |
| Notes | 1. Post‐randomisation exclusions or loss to follow‐up not reported 2. Observed pregnancy/total number of women: LNG 5/80; Mife 10/80 |
|
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Random sequence generation (selection bias) | Unclear risk | Mentioned randomisation but description not adequate |
| Allocation concealment (selection bias) | Unclear risk | Method of allocation concealment not mentioned |
| Blinding (performance bias and detection bias) All outcomes | Unclear risk | Not mentioned |
| Incomplete outcome data (attrition bias) All outcomes | Unclear risk | No mention of post‐randomisation exclusion and loss to follow‐up |
| Selective reporting (reporting bias) | Low risk | Reported planned outcomes |
| Other bias | Low risk | None detected |
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