WHO 1991.

Methods	randomisation at WHO, using random permutation block technique with block size of 8, random numbers were provided to each centre in a sealed envelope
Participants	multicentre; 10 mostly academic hospitals: Aberdeen, Havana, Hong Kong, Ljubljana, Milan, Shanghai, Singapore, Stockholm, Szeged, Wuhan. 385 women were randomised. inclusion criteria: amenorrhoea ≤ 49 days, regular cycles (25‐35 days) for last 3 months exclusion criteria: unsure about dates, intrauterine device in situ, hormonal contraception during last cycle and intention to start hormonal contraception before first period after abortion
Interventions	group 1: mifepristone 25mg/12 hourly/ 5 doses and gemeprost 1mg/vaginally 60 hours after the start of the treatment group 2: mifepristone 600mg/single dose and gemeprost 1mg/vaginally 60 hours after the start of the treatment
Outcomes	complete, incomplete, missed abortion, continuing pregnancy, side effects, bleeding pattern, haemoglobin and hormone levels
Notes	1 woman received blood transfusion; not mentioned which group
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment (selection bias)	Low risk	A ‐ Adequate