Han 2001a

Methods	Women 'randomly allocated' to 2 groups. Method of randomisation not reported
Participants	100 women attending a hospital clinic in Shanghai, China. Women had regular menstrual periods and a single act of unprotected intercourse within 120 h of attending the clinic
Interventions	Mife single dose 25 mg vs Mife 10 mg
Outcomes	Observed number of pregnancies, side effects and changes in menstrual pattern
Notes	No loss to follow‐up and exclusions reported No pregnancies in either group
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 loss to follow‐up and exclusions reported
Selective reporting (reporting bias)	Low risk	Planned outcome was reported
Other bias	Low risk	None detected