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. 2011 Nov 9;2011(11):CD002855. doi: 10.1002/14651858.CD002855.pub4

WHO 1993 GP1pv.

Methods randomisation at WHO, using random permutation block technique with block size of 9, tablets were disposed into labelled bottles, placebos were added to women receiving the lower dose so that all received 3 tablets)
Participants multicentre, Hospitals in Aberdeen, Edinburgh, Havana, Hong Kong, Ljubljana, Milan, Shanghai, Stockholm, Szeged, Tianjin, Wuhan 
 1182 pregnant women with a menstrual delay of 7‐28 days 
 inclusion criteria: 
 regular cycles (25‐35 days) for last 3 months, pregnancy confirmed by ultrasound 
 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, contraindication to mifepristone/misoprostol, regular use of prescribed drugs
Interventions group 1: mifepristone 200mg/oral 
 group 2: mifepristone 400mg/oral 
 group 3: mifepristone 600mg/oral 
 and prostaglandin 1mg/vaginally after 48 hours (all)
Outcomes complete, incomplete, missed abortion, continuing pregnancy, side effects, haemoglobin levels, side effects
Notes 3 women received blood transfusion; not mentioned which group
Risk of bias
Bias Authors' judgement Support for judgement
Allocation concealment (selection bias) Low risk A ‐ Adequate