Shechter‐Maor 2015.

Methods	RCT
Participants	Inclusion criteria: singleton, GA 37 weeks or more, cephalic presentation, intact membranes, unfavourable cervix (BS =/< 6), oligohydramnios (AFI =/< 5) Exclusion criteria: multifetal gestation, fetal malpresentation, spontaneous labour, contraindication to PGs or a vaginal delivery (e.g. placenta previa), non‐reassuring FHR tracing, a fetus with major anomalies or previous CS
Interventions	1. Propess (10 mg slow release PGE), n = 26 2. Double balloon (Cook), n = 26
Outcomes	Time from induction to active labour (defined as cervical dilation of at least 5 cm), induction to delivery time, CS and operative delivery rates, oxytocin augmentation, uterine tachysystole (defined as greater than 5 uterine contractions in 5 minutes), meconium passage, FHR changes, AS and maternal satisfaction
Notes	Setting: Israël Study period: not reported Funding: none received Declarations of interest: none declared
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Using computer‐generated, random sequences
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	ITT not reported, no missing data described. No figure 1, all women analysed
Selective reporting (reporting bias)	High risk	All pre‐specified outcomes reported but secondary outcome 'AS'
Other bias	Unclear risk	Not mentioned in method section how long balloon/dinoprostone was given and what happened after ripening process.