Lyndrup 1994.

Methods	RCT
Participants	Singleton vertex pregnancy, intact membranes with unfavourable cervix.
Interventions	Foley extra‐amniotic 30 mL (59 women) PGE2 2.5 mg pessaries (50 women)
Outcomes	Vaginal delivery not achieved within 24 hours, CS, instrumental delivery, women not satisfied, caregiver not satisfied, pH, AS.
Notes	Setting: Denmark Study:period: June 1990 ‐ March 1993 Funding sources: not reported Declarations of interest: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	No details on the method of generation of the sequence.
Allocation concealment (selection bias)	Low risk	Concealment of allocation by sealed envelopes
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Not feasible due to nature of intervention
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not reported
Incomplete outcome data (attrition bias) All outcomes	High risk	ITT reported, but 4 women were lost to follow‐up. Women were excluded if delivered after 48 hours
Selective reporting (reporting bias)	Low risk	All pre‐specified outcomes reported
Other bias	Low risk	No other bias detected