Salim 2011.

Study characteristics
Methods	RCT
Participants	Inclusion: viable singleton pregnancy, cephalic presentation, intact membranes, BS of ≤ 6. Exclusion: contraindication for vaginal delivery, previous caesarean delivery, a low‐lying placenta, fetal malformations that were incompatible with postpartum life, intrauterine fetal death, clinical amnionitis, carriers of hepatitis B/C, HIV, allergy to latex.
Interventions	1. Foley: (n = 145) 24 F, 60 mL, max 12 hours 2. Double balloon (n = 148), 80/80 mL, max 12 hours
Outcomes	Time from insertion of the catheter to delivery, mode of delivery, vaginal deliveries within 24 hours, abnormal fetal presentation, cord prolapse, intrapartum fever more than 38°C, bleeding related to catheter insertion, AS.
Notes	Setting: Emek medical centre, Afula, Israel. (teaching medical centre) Study period: June 2008 and December 2010 Funding: Department of obstetrics, Emek medical centre Declarations of interest: none reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated numbers, block randomisation
Allocation concealment (selection bias)	Low risk	Sequentially‐numbered allocation, stored in a box.
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 reported and not clear if done, no missing data or cases.
Selective reporting (reporting bias)	Low risk	All pre‐specified outcomes were reported in results
Other bias	Low risk	No other bias detected