Glagoleva 1999.

Study characteristics
Methods	RCT. No details were given on the method for concealment of the allocation.
Participants	BS < 5. Women with a past history of CS were excluded.
Interventions	Dilapan (4 tents) removed after 12 hours (27 women). PGE2 intracervical gel 0.5 mg (1‐2 doses) (26 women).
Outcomes	CS.
Notes	Abstract only Setting: Russia 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	Only reported women were randomly assigned.
Allocation concealment (selection bias)	Unclear risk	Not reported
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	Insufficient information to judge
Selective reporting (reporting bias)	Unclear risk	Insufficient information to judge
Other bias	Unclear risk	Abstract only, insufficient information to judge risk of bias