a Women with first (n = 36) or second (n = 37) trimester loss, cervical factor (n = 22), still birth (n = 15), threatened PTB ± spotting (n = 19), placenta previa (n = 5), PTB primary prophylaxis (n = 22), PTB secondary prophylaxis (n = 12), elderly primi (n = 2), polyhydramnios (n = 3), uterine fibroid (n = 3), twin (n = 7), septate uterus (n = 2).
NMP-SR = natural micronised progesterone sustained release; N = number of subjects; PTB = preterm birth; RET = retrospective; RPL = recurrent pregnancy loss.