Low‐dose hCG showed no clear difference in clinical pregnancy compared with FSH throughout the COH (low certainty).
Embryo culture with low oxygen concentration probably leads to higher clinical pregnancy rate compared with embryo culture with atmospheric oxygen concentration (moderate certainty).
Low‐dose aspirin showed no clear difference in clinical pregnancy compared with placebo or no treatment (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).
Single may leads to lower clinical pregnancy compared with multiple embryo transfer (low certainty).
Repeated single embryo transfer (mixed policies) showed no clear difference in clinical pregnancy rate compared with multiple embryo transfer (low certainty).
Vitrification probably leads to higher clinical pregnancy rate compared with slow freezing (moderate certainty).
It is very uncertain whether day 3 changes clinical pregnancy rate per woman compared with day 2 embryo transfer following IVF or ICSI (very low certainty).
It is very uncertain whether 37°C changes clinical pregnancy compared with any lower temperature (very low certainty).
Endometrial injury showed no clear difference in clinical pregnancy per woman randomised (studies at low risk of… compared with control (moderate certainty).
It is very uncertain whether glucocorticoids changes clinical pregnancy rate per couple: dosage and timing of… compared with no glucocorticoids or placebo (very low certainty).
The intervention showed no clear difference in clinical pregnancy; type of antioxidant (natural conceptions and… (low certainty).
Letrozole with or without adjuncts leads to higher clinical pregnancy rate compared with SERMs with or without adjuncts followed by timed intercourse (high certainty).
It is very uncertain whether hyaluronic acid‐selected sperm (HA‐ICSI) changes miscarriage per clinical pregnancy compared with viscous medium containing HA (SpermSlow) (very low certainty).
It is very uncertain whether hyaluronic acid‐selected sperm (HA‐ICSI) changes clinical pregnancy per woman randomly assigned compared with viscous medium containing HA (SpermSlow) (very low certainty).
Metformin may leads to higher clinical pregnancy rate (per woman) compared with placebo co‐treatment (low certainty).
It is very uncertain whether higher changes clinical pregnancy per woman randomised: sensitivity analysis… compared with lower degree of injury (very low certainty).
It is very uncertain whether the intervention changes clinical pregnancy: prior cycle vs IUI cycle (sensitivity analysis) (very low certainty).