Ding 2005

Methods	Women 'randomly allocated' to 3 groups. Method of randomisation not reported
Participants	240 women attending the clinic in an MCH hospital, Henan, China. Women had regular menstrual periods and a single act of unprotected intercourse within 120 h of attending the clinic
Interventions	Mife 75 mg vs Mife 50 mg vs Mife 10 mg, orally
Outcomes	Observed number of pregnancies, side effects and changes in menstrual pattern
Notes	Loss to follow‐up: Mife 75 mg: 2; Mife 50 mg: 3; Mife 10 mg: 6 Observed pregnancy/total number of women: Mife 75 mg: 1/78; Mife 50 mg: 1/77; Mife 10 mg: 1/74
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	Low risk	Loss to follow‐up was reported
Selective reporting (reporting bias)	Low risk	Planned outcome of pregnancy rate was reported
Other bias	Low risk	None detected