High probably leads to higher live birth rate ‐ high vs low or no hyaluronic acid compared with low or no hyaluronic acid (moderate certainty).
High probably leads to higher clinical pregnancy rate ‐ high vs low or no hyaluronic acid compared with low or no hyaluronic acid (moderate certainty).
Embryo culture with low oxygen concentration probably leads to higher live birth rate compared with embryo culture with atmospheric oxygen concentration (moderate certainty).
Embryo culture with low oxygen concentration probably leads to higher ongoing pregnancy rate compared with embryo culture with atmospheric oxygen concentration (moderate certainty).
Embryo culture with low oxygen concentration probably leads to higher clinical pregnancy rate compared with embryo culture with atmospheric oxygen concentration (moderate certainty).
Embryo culture with low oxygen concentration showed no clear difference in multiple‐pregnancy rate compared with embryo culture with atmospheric oxygen concentration (low certainty).
Embryo culture with low oxygen concentration showed no clear difference in miscarriage rate compared with embryo culture with atmospheric oxygen concentration (low certainty).
It is very uncertain whether embryo culture with low oxygen concentration changes congenital abnormalities compared with embryo culture with atmospheric oxygen concentration (very low certainty).
Low‐dose aspirin showed no clear difference in live birth compared with placebo or no treatment (moderate certainty).
Low‐dose aspirin showed no clear difference in clinical pregnancy compared with placebo or no treatment (moderate certainty).
Low‐dose aspirin showed no clear difference in multiple pregnancy (on ultrasound) compared with placebo or no treatment (low certainty).
Low‐dose aspirin showed no clear difference in miscarriage rate per woman compared with placebo or no treatment (low certainty).
It is very uncertain whether low‐dose aspirin changes ectopic pregnancy compared with placebo or no treatment (very low certainty).
It is very uncertain whether low‐dose aspirin changes vaginal bleeding compared with placebo or no treatment (very 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 low‐frequency electroacupuncture changes adverse eventsc compared with physical exercise or no intervention (very low certainty).
The review found no eligible studies for this question.