Calder 1975.

Methods	Automatic 'machine' randomisation.
Participants	100 primigravidas with bishop score 6 or less at 37‐42 weeks.
Interventions	All participants had amniotomy at the start. Intravenous oxytocin doubling hourly to a maximum of 64 mu/min vs prostaglandin E2 intravenously doubling hourly to a maximum of 4 ug/min. Half of each group received the infusion via an automatic infusor correlated to intrauterine pressures. All women had epidurals. Amniotomy was performed when possible (not specified).
Outcomes	Caesarean sections reported but unable to extract the failure to deliver within 24 hours data.
Notes	Very high forceps delivery rate probably accounted for by the use of epidurals.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Low risk	A ‐ Adequate