The review found no eligible studies for this question.
Progesterone showed no clear difference in live birth/ongoing pregnancy rate compared with no treatment or placebo (route of progesterone administration) (low certainty).
Progesterone showed no clear difference in miscarriage per clinical pregnancy compared with no treatment or placebo (route of progesterone administration) (low certainty).
Progesterone may leads to higher clinical pregnancy per woman compared with no treatment or placebo (route of progesterone administration) (low certainty).
It is very uncertain whether progesterone changes clinical pregnancy per woman ‐ oral route compared with no treatment or placebo (route of progesterone administration) (very low certainty).
Progesterone showed no clear difference in multiple pregnancy per woman compared with no treatment or placebo (route of progesterone administration) (low certainty).
The review found no eligible studies for this question.
Progesterone showed no clear difference in live birth or ongoing pregnancy compared with progesterone + oestrogen (low certainty).
Progesterone showed no clear difference in clinical pregnancy compared with progesterone + oestrogen (low certainty).
Progesterone showed no clear difference in OHSS 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 may leads to lower clinical pregnancy compared with progesterone + GnRH agonist (low certainty).
It is very uncertain whether progesterone changes OHSS compared with progesterone + GnRH agonist (very low certainty).
The review found no eligible studies for this question.
It is very uncertain whether oral progesterone changes ongoing pregnancy rate compared with vaginal progesterone (very low certainty).
It is very uncertain whether oral progesterone changes miscarriage rate per clinical pregnancy compared with vaginal progesterone (very low certainty).
It is very uncertain whether oral progesterone changes clinical pregnancy rate compared with vaginal progesterone (very low certainty).
The review found no eligible studies for this question.
The review found no eligible studies for this question.
Progesterone may leads to higher clinical pregnancy rate compared with placebo/no treatment (low certainty).