Jozwiak 2012.

Methods	RCT
Participants	Inclusion criteria: pregnant women scheduled for IOL beyond 37 weeks of gestation with a vital singleton pregnancy in cephalic presentation, intact membranes, and an unfavourable cervix (BS < 6). Exclusion criteria: women younger than 18 years, with a previous CS, placenta praevia, lethal fetal congenital anomaly, or known hypersensitivity for one of the products used for induction were ineligible
Interventions	Foley catheter (n = 411): 18F, 30 cc sterile saline. PG E2 gel (408): 1 mg, followed by 1 mg after 6 hours, with a max of 2 doses per 24 hours inserted into the posterior vaginal fornix. An initial dose of 2 mg was allowed in nulliparous women. 2 days of induction, 1 day of " rest" followed by 2 more days of induction in case of BS < 6
Outcomes	CS, maternal and neonatal morbidity and time from start induction to birth.
Notes	Setting: multicentre, the Netherlands Study period: Feb 2009 ‐ May 2010 Funding: none Declarations of interest: none declared
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Computer‐generated randomisation
Allocation concealment (selection bias)	Low risk	Web‐based
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	Low risk	ITT, missing outcome data (pH and BMI) balanced in numbers across intervention groups, with similar reasons for missing data across groups. no missing cases
Selective reporting (reporting bias)	Low risk	All pre‐specified outcomes were reported in results
Other bias	Low risk	No other bias detected