Zuo 1999.

Methods	Double‐blind, randomised trial Random number generation done centrally. Double‐blinded by use of identical placebos
Participants	668 women recruited from 14 family planning clinics in Changsha, China. Women aged < 40 years had regular menstrual periods and attended the clinic within 72 h of a single act of unprotected intercourse
Interventions	Mife 10 mg, single dose vs Mife 25 mg, orally
Outcomes	Observed number of pregnancies, side effects and changes in menstrual pattern
Notes	Loss to follow‐up 8/668 Observed pregnancy/expected pregnancy/total number of women: Mife 10 mg 3/26/321; Mife 25 mg 2/24/339
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Random number generation done centrally
Allocation concealment (selection bias)	Unclear risk	Method of allocation concealment not mentioned
Blinding (performance bias and detection bias) All outcomes	Low risk	Double‐blind
Incomplete outcome data (attrition bias) All outcomes	Low risk	Loss to follow‐up reported
Selective reporting (reporting bias)	Low risk	Reported planned outcomes
Other bias	Low risk	None detected

COC: combined oral contraceptive; Cu‐IUD: copper intrauterine device; EC: emergency contraception; ITT: intention to treat; IUD: intrauterine device; LNG: levonorgestrel; MCH: maternal and child health; Mife: mifepristone; MTX: methotrexate; RCT: randomized controlled trial; UPA: ulipristal acetate; WHO: World Health Organization