Comparison 1. Ambroxol versus betamethasone.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Incidence of RDS	7	758	Risk Ratio (M‐H, Fixed, 95% CI)	0.79 [0.59, 1.07]
1.1 Single pregnancy	7	699	Risk Ratio (M‐H, Fixed, 95% CI)	0.86 [0.62, 1.18]
1.2 Multiple pregnancy	4	59	Risk Ratio (M‐H, Fixed, 95% CI)	0.50 [0.24, 1.06]
2 Perinatal mortality	6	657	Risk Ratio (M‐H, Fixed, 95% CI)	0.51 [0.23, 1.12]
3 Adverse effects in pregnant women	3	305	Risk Ratio (M‐H, Random, 95% CI)	3.45 [0.34, 35.51]