2. Sensitivity analysis for primary outcomes.

Study (number of participants)	OR (95% CI) Fixed‐effect	OR (95% CI) Random‐effects	RR (95% CI) Fixed‐effect	RR (95% CI) Random‐effects
Cumulative live birth rate Chen 2016 (1508) Ferraretti 1999 (125) Santos‐Ribeiro 2020 (184) Shapiro 2011a (103) Shapiro 2011b (122) Vuong 2018 (782) Wei 2019 (1650) Wong 2021 (204)	1.08 (0.95 to 1.22)	1.08 (0.95 to 1.22)	1.03 (0.98 to 1.07)	1.03 (0.99 to 1.08)
OHSS Chen 2016 (1508) Ferraretti 1999 (125) Santos‐Ribeiro 2020 (184) Vuong 2018 (782) Wei 2019 (1650) Wong 2021 (204)	0.26 (0.17 to 0.39)	0.25 (0.13 to 0.46)	0.22 (0.14 to 0.37)	0.25 (0.14 to 0.44)
CI: confidence interval; OHSS: ovarian hyperstimulation syndrome; OR: odds ratio;RR: risk ratio

In the studies of Santos‐Ribeiro 2020; Shapiro 2011a there was lost to follow up for the primary outcome and therefore numbers of participants differ with the Characteristics tables.