Patterson 1971.

Methods	Study design: Parallel study. Two arms with crossover if labour not established after 24 hours. Patients excluded after initial randomization due to obstetrical factors.
Participants	Participants: Initial randomization: 441 41 patients excluded thereafter. Primigravid and multigravid patients. Reason for induction: Medical conditions (PET, Eclampsia, Rhesus disease, other); obstetrical (prolonged pregnancy, malpresentations, multiple pregnancy, antepartum haemorrhage, disproportion, other). No information analyses given of patients with previous caesarean sections. No information given on gestational age ( assumed to be third trimester inductions).
Interventions	Intervention 1: Amniotomy + intravenous oxytocin (0.5 IU/1000 ml dextrose and water; increased half hourly to 20 drops per minute. Thereafter 2 IU/1000 ml and 4 IU/1000 ml respectively, max 60 drops/min). Intervention 2: Amniotomy. If not in labour by 24 hours; Intravenous oxytocin added.
Outcomes	Included outcomes: Caesarean section; instrumental vaginal delivery; post partum haemorrhage. Other outcomes: Patients not in labour after 24 hours (given as mean; sedatives required during labour (given as number of doses required); bacteriological investigations (groups not specified).
Notes	Intra uterine deaths/ intrapartum deaths included in data but subgroup analyses not possible.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear