Ahmed 2016.

Study characteristics
Methods	RCT
Participants	Inclusion: postdate pregnancy (> 40 weeks) singleton gestation, intact membranes, cephalic fetal BS ≤ 4 Exclusion: previous caesarean deliveries, EFW > 4000 g, non‐reassuring fetal conditions, ruptured membranes, placenta previa, malpresentation
Interventions	Foley catheter (n = 39), 18 F, filled with 50 mL Cook balloon (n = 39), filled with 80/80 mL Max of 12 hours of priming
Outcomes	Cervical ripening and BS after 12 hours, VAS for catheter insertion, catheter insertion (easy, moderate or difficult), VAS for patient satisfaction after birth, insertion expulsion time, insertion amniotomy time, insertion delivery time and mode of delivery. Abnormal fetal presentation, cord prolapse, bleeding related to catheter insertion that required removal of the catheter and AS
Notes	Setting: Gynaecology, Suez Canal University Hospital, Egypt Study period: March 2013 to April 2014 Funding: not mentioned Declaration of interest: none declared
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Low risk	Shuffling 78 envelopes, 1:1
Allocation concealment (selection bias)	Low risk	Sealed envelopes, opaque?
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 described
Incomplete outcome data (attrition bias) All outcomes	High risk	ITT not mentioned, 2 women excluded because of failed placement. no missing data mentioned
Selective reporting (reporting bias)	High risk	Pre‐specified outcomes bleeding after insertion, cord prolapse and abnormal fetal presentation not described in results
Other bias	Low risk	No other bias detected