Tromans 1981.

Methods	Allocation by date of admission.
Participants	60 women with singleton cephalic pregnancy, > 37 weeks, presentation unfavourable cervix < 4 on modified Bishops score. Inpatients.
Interventions	150 mg intravaginal oestradiol vs 4 mg vaginal PGE2 Both in a tylose gel.
Outcomes	Uterine hyperstimulation, caesarean section, epidural analgesia.
Notes	Royal Liverpool Hospital, UK. Inpatient setting. Source of funding not stated.
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	High risk	C ‐ Inadequate

SRM=artificial rupture of the membranes 
 IV = intravenous

IP = inpatient

min = minimum 
 max = maximum

OP = outpatient 
 RCT = randomised controlled trial 
 vs = versus