Olund 1978.

Methods	Randomly assigned.
Participants	92 pregnant women (group I: 23, group II: 23, group III: 23, group IV: 23) Inclusion criteria: 13‐25 weeks gestation. Exclusion criteria: none described.
Interventions	Group I: extra‐amniotic instillation of 0.1% solution of rivanol, 10 ml per gestational week. Maximum of 150 ml. Group II: extra‐amniotic instillation of 1 ml of saline containing 0.25 mg PGF2α per ml, 3 ml every 2 hours for up to 24 hours. At a gestational age >16 weeks, the dose was doubled. Group III: Rivanol + PGF2α, as in group I and II. Group IV: Rivanol + a half dose of PGF2α, as in group III, except for a half dose of PGF2α. NB: For our analysis, we included group I and II.
Outcomes	Abortion time, abortion interval, side‐effects.
Notes	No definition of abortion was given. No major complications described.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	B ‐ unclear
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.