Wong 1998.

Methods	Randomisation schedule, (sealed) envelopes bearing the subject number and allocation were prepared as described by Meinert. The envelopes were opened only when recruited.
Participants	140 pregnant women (group I: 70, group II: 70) Inclusion criteria: healthy women, age 16‐40 years, 14‐20 weeks gestation. Exclusion criteria: regular use of prescription drugs, cardiac disorders, IUD in situ, missed abortion, multiple pregnancy, nursing mothers.
Interventions	Group I: misoprostol 400 μg vaginally every 3 hours, max 5d. Group II: gemeprost 1 mg vaginally every 3 hours, max 5d.
Outcomes	Primary outcomes: induction‐abortion interval, rates of successful abortion (within 24 h), complete abortion. Secondary outcomes: side‐effects.
Notes	Definition of abortion: expulsion of fetus. If the placenta was incomplete, evacuation of the uterus was performed under general anaesthesia. No major complications reported.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ adequate
Blinding? All outcomes	High risk
Free of other bias?	Low risk	No statistically significant differences between the groups in terms of maternal age, gestational age and parity.