a Subsequent ovulation induction was achieved using administration of human chorionic gonadotropin.
b Publication in Chinese; additional details not available in English abstract.
bd = twice daily; CC= clomiphene citrate; DYD = dydrogesterone; FSH = follicle-stimulating hormone; GnRH = gonadotropin-releasing hormone; hMG = human menopausal gonadotropin; IM = intramuscular; IUI = intrauterine insemination; NMP = natural micronised progesterone; N = number of subjects; OB = observational study; OL = open-label; P = progesterone; qds = four times daily; RCT = randomised controlled trial; RET = retrospective; SR = sustained release; tds = three times daily.
Table 2. Studies evaluating oral natural micronised progesterone for prevention of threatened miscarriage.