Suikkari 1983.

Study characteristics
Methods	Randomised trial, no further details
Participants	Number of women randomised: 119 Setting: Lappenranta, Finland Study date: recruitment October 1980 to December 1981 Inclusion criteria At least 10 days post‐date Regular menses GA at intervention: 41+ weeks Primiparous and multiparous women Exclusion criteria Cases where the fetal biparietal measure different in mid pregnancy ultrasonography by over 10 days from the mean curve were excluded. State of cervix: not used as a criterion
Interventions	Induction group (n = 66): oxytocin alone or with AROM depending on the cervix versus EM group (n = 53): obstetric examination, NST, biochemical tests and amniotic fluid determination every 3 days
Outcomes	Mother: mode of birth (reported only as operative); duration of labour; mean blood loss during labour; maternal death Baby: mean birthweight; Apgar scores; perinatal death; stillbirth; neonatal death
Notes	The study was available as an abstract only. Funding: not reported Declarations of interest: not reported
Risk of bias
Bias	Authors' judgement	Support for judgement
Random sequence generation (selection bias)	Unclear risk	The method of sequence generated was not reported.
Allocation concealment (selection bias)	Unclear risk	The method of allocation concealment was not reported.
Blinding of participants and personnel (performance bias) All outcomes	High risk	Blinding was not feasible.
Blinding of outcome assessment (detection bias) All outcomes	Unclear risk	Blinded outcome assessment was not mentioned.
Incomplete outcome data (attrition bias) All outcomes	Unclear risk	Insufficient information to determine losses to follow‐up or exclusions
Selective reporting (reporting bias)	Unclear risk	No outcomes were prespecified (abstract).
Other bias	Unclear risk	Unable to identify other bias based on the abstract; some degree of imbalance in numbers randomised to each group (66 and 53).