Allouche 1993.

Study characteristics
Methods	RCT. No details were given on the method for concealment of the allocation.
Participants	BS < 6, vertex, singleton, no previous CS.
Interventions	PGE2 (Prepidil 0.5 mg) intracervical (59 women); Foley 50 mL (60 women); PGE2 (Prepidil 0.5 mg) and Foley 50 mL extra‐amniotic (63 women).
Outcomes	Uterine hyperstimulation, discomfort during the procedure, maternal and neonatal infection.
Notes	Setting: not reported Dates of study:between April and December 1992 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	Only stated women were randomly allocated
Allocation concealment (selection bias)	Unclear risk	Unclear
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	Unclear risk	ITT not mentioned, no missing data or cases reported
Selective reporting (reporting bias)	Unclear risk	No outcomes pre‐specified
Other bias	Low risk	No other bias detected