Griffith‐Jones 1990.

Methods	RCT.
Participants	200 women. Singleton, cephalic, mixed parity, ruptured membranes. No evidence of contractions more frequent than every 20 minutes or evidence of clinical infection.
Interventions	IV oxytocin (maximum dose for primiparous women 50 mU/min, multiparous women 10 mU/min) vs 3 mg vaginal PGE2 pessary repeated after 6 hours.
Outcomes	C/S, instrumental vaginal delivery, uterine hyperstimulation, Apgar score.
Notes	Randomisation schedule from random number tables, concealment by sealed, sequentially numbered opaque envelopes.
Risk of bias
Bias	Authors' judgement	Support for judgement
Adequate sequence generation?	Low risk	Random number tables.
Allocation concealment?	Low risk	Sequentially numbered, opaque, sealed envelopes.
Blinding? Women	High risk
Blinding? clinical staff	High risk
Blinding? outcome assessor	High risk
Incomplete outcome data addressed? All outcomes	Low risk	All women followed up.
Free of selective reporting?	Low risk