Progesterone showed no clear difference in live birth or ongoing pregnancy compared with progesterone + oestrogen (low certainty).
It is very uncertain whether progesterone changes live birth or ongoing pregnancy compared with progesterone + GnRH agonist (very low certainty).
Progesterone showed no clear difference in live birth/ongoing pregnancy rate compared with no treatment or placebo (route of progesterone administration) (low certainty).
It is very uncertain whether progesterone changes live birth or ongoing pregnancy compared with placebo/no treatment (very low certainty).
Progesterone showed no clear difference in live birth or ongoing pregnancy compared with hCG regimens (low certainty).
Progesterone showed no clear difference in live birth rate/ongoing pregnancy compared with placebo/no treatment (low certainty).
Progesterone showed no clear difference in live birth rate/ongoing pregnancy rate compared with placebo/no treatment (low certainty).