Answers are grounded in this paper and cite their sources.
A double-blind randomized controlled trial investigated the use of extra-amniotic ethinyloestradiol for ripening the unfavourable cervix at term. Twenty-five primigravidae were treated with 150 mg ethinyloestradiol gel while 24 primigravidae were treated with gel alone. There was no statistical difference between the ethinyloestradiol and control groups in either mean change in Bishop score or the induction-to-delivery interval.
No takes yet. Share an insight, caveat, or question.
Peedicayil et al. (1989) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: