Solt 2009.

Methods	RCT
Participants	100 primiparae and 100 multiparae women with an unfavourable BS
Interventions	Foley catheter:(nulliparae n = 50) Double balloon:(nulliparae n = 45)
Outcomes	Primary outcomes were BS increment, time from catheter withdrawal to delivery, CS rate and post caesarean febrile morbidity.
Notes	Abstract only, numbers only given for nulliparae Setting: Israel Study period: not reported Funding: not reported Declarations of interest: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated numbers
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	Reported it was a single‐blinded study, not how blinding was performed.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	20 women excluded from analyses, not clear why
Selective reporting (reporting bias)	Low risk	All pre‐specified outcomes reported
Other bias	Unclear risk	Abstract only