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Progesterone showed no clear difference in ongoing pregnancy rate compared with placebo/no treatment (low certainty).
Progesterone showed no clear difference in miscarriage rate per clinical pregnancy compared with placebo/no treatment (low certainty).
Progesterone may leads to higher clinical pregnancy rate compared with placebo/no treatment (low certainty).
Progesterone showed no clear difference in multiple pregnancy rate compared with placebo/no treatment (low certainty).
The review found no eligible studies for this question.
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/ongoing pregnancy rate compared with no treatment or placebo (route of progesterone administration) (low certainty).
Progesterone showed no clear difference in miscarriage rate per clinical pregnancy compared with placebo/no treatment (low certainty).
Progesterone may leads to higher clinical pregnancy compared with placebo/no treatment (low certainty).
Progesterone showed no clear difference in multiple pregnancy compared with placebo/no treatment (low certainty).
The review found no eligible studies for this question.
It is very uncertain whether 300 mg vaginal progesterone changes ongoing pregnancy rate compared with 600 mg vaginal progesterone (very low certainty).
It is very uncertain whether 300 mg vaginal progesterone changes multiple pregnancy rate compared with 600 mg vaginal progesterone (very low certainty).
It is very uncertain whether intramuscular (IM) progesterone changes ongoing pregnancy rate compared with vaginal progesterone (very low certainty).
It is very uncertain whether intramuscular (IM) progesterone changes clinical pregnancy rate compared with vaginal progesterone (very low certainty).
Progesterone showed no clear difference in miscarriage per clinical pregnancy compared with no treatment or placebo (route of progesterone administration) (low certainty).
The review found no eligible studies for this question.
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).