Sorensen 1984.

Methods	Use of random numbers.
Participants	39 pregnant women (group I: 20, group II: 19) Inclusion criteria:13‐24 weeks of gestation. Exclusion criteria: intra‐uterine fetal death, cardiopulmonary disease, nephropathy, liver diseases, previous operation on the uterus
Interventions	Group I: 2x PGE2 0.75 mg within 5 hours intracervical/extra amniotic, 5 hours, later followed by oxytocin infusion 0.15 IU/min if no contractions. Group II: PGF2α 40 mg intra‐amniotically 5 hours later followed by oxytocin drip 0.15 IU/min if no contractions.
Outcomes	Primary outcomes: abortion success rate, induction‐abortion interval. Secondary outcomes: side‐effects.
Notes	Definition of abortion: expulsion of fetus. If the placenta was not expelled within 2 hours, an evacuation of the uterus was performed. No major complications reported.
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.