Bendvold 1990.

Methods	Unclear method of randomisation and concealment.
Participants	28 term women (> 39 weeks' gestation).
Interventions	The 'coitus' group were asked to have sexual intercourse for 3 consecutive nights with vaginal semen deposit. The control group were asked to abstain from sexual intercourse for the same period. Both groups were asked to avoid nipple stimulation. A baseline Bishops score was taken and repeated after 3 days.
Outcomes	Change in Bishops score, Apgar scores.
Notes
Risk of bias
Bias	Authors' judgement	Support for judgement
Allocation concealment?	Unclear risk	B ‐ Unclear