Su 2001

Methods	Women who had had unprotected intercourse within the preceding 72 h were 'randomly allocated' to Mife or LNG groups, and women who had had unprotected intercourse within the previous 72 h‐120 h were assigned to an IUD group. Randomisation took place between 2 types of pills
Participants	315 women attending a hospital clinic, Baotou, China. Women had regular menstrual periods and unprotected intercourse once within 72 to 120 h (in the case of IUDs)
Interventions	Mife 25 mg, single dose vs LNG 0.75 mg, twice, orally vs Cu‐IUD This study had three treatment arms, but the Cu‐IUD comparison was not randomized. Hence, we excluded this comparison and included only the mifepristone vs levonorgestrel comparison
Outcomes	Observed number of pregnancies
Notes	Post‐randomisation exclusion or loss to follow‐up not reported Observed pregnancy/total number of women: IUD 1/162; Mife 2/64; LNG 5/89 (1 ectopic pregnancy)
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	Mentioned randomization 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	Post‐randomisation exclusion or loss to follow‐up not reported
Selective reporting (reporting bias)	Low risk	Reported planned outcomes
Other bias	Low risk	None detected