Peedicayil 1998.

Study characteristics
Methods	Randomised equivalence trial
Participants	Primigravid, requiring IOL, BS < 5
Interventions	n = 60 'randomised into 2 groups' Foley 12 hours PGE2 intracervically
Outcomes	Change in BS, ripening to delivery interval
Notes	None of our outcomes of interest were reported Setting: tertiary level teaching hospital, India Dates of study: not reported 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	Not described.
Allocation concealment (selection bias)	Low risk	Sequentially‐numbered opaque sealed envelopes.
Blinding of participants and personnel (performance bias) All outcomes	Unclear risk	Person assessing BS was blinded to what agent was used (after 12 hours and removal of agent I presume).
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Not reported
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Not reported how many women were randomised to which group, thus unclear.
Selective reporting (reporting bias)	Unclear risk	The methods section states that only BS and ripening to delivery interval were the outcomes of interest, which is questionable.
Other bias	High risk	Retrospective power calculation, unclear how many women in which group.