The review found no eligible studies for this question.
Short protocol showed no clear difference in clinical pregnancies per woman randomised compared with stop short protocol (low certainty).
The review found no eligible studies for this question.
It is very uncertain whether short changes clinical pregnancies per woman randomised compared with ultrashort protocol (very low certainty).
Metformin may leads to lower live birth rate per woman ‐ short protocol GnRH‐antagonist compared with placebo or no treatment (low certainty).
It is very uncertain whether metformin changes clinical pregnancy rate per woman ‐ short protocol GnRH‐antagonist compared with placebo or no treatment (very low certainty).
The intervention showed no clear difference in live birth or ongoing pregnancy Short protocol vs long protocol (low certainty).
Long protocol showed no clear difference in live birth or ongoing pregnancies per woman randomised compared with short protocol (low certainty).
Long protocol probably leads to higher clinical pregnancies per woman randomised compared with short protocol (moderate certainty).
Long protocol showed no clear difference in live birth and ongoing pregnancies per woman randomised compared with ultrashort protocol (low certainty).
Long protocol showed no clear difference in clinical pregnancies per woman randomised compared with ultrashort protocol (low certainty).
It is very uncertain whether enhanced recovery protocol changes short‐term mortality compared with standard care (very low certainty).
The intervention showed no clear difference in live birth/ongoing pregnancy ‐ short vs long protocol (low certainty).
The review found no eligible studies for this question.
Anticholinergic and short‐acting beta2‐agonists leads to lower primary outcome: hospital admissions hospital admissions compared with beta2‐agonists alone (all protocols) (high certainty).