General Study Characteristics
Study characteristics are summarized in Table S1. The majority of articles (n=18 (38%)) were published by authors from the United Kingdom, with the second most (n=8 (17%)) originating from the United States. The majority of the articles (n=36 (75%)) were published in the Cochrane Library with the second most (n=4 (8.3%)) being published in the American Journal of Obstetrics and Gynecology. Government funding was involved in the largest proportion of the publications (n=16 (33%)), and philanthropic funding was reported for the fewest number of articles (n=2 (4.1%)). Some articles did not report any source of funding (n=12 (25%)). The use of prostaglandins for the induction of labour was the method most frequently evaluated (n=9 (19%)), whereas many methods of induction were only reported in a single systematic review.