Comparison 1. Low vs normal salt intake in pregnancy.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Hypertension	1	242	Risk Ratio (M‐H, Fixed, 95% CI)	0.98 [0.49, 1.94]
2 Pre‐eclampsia	2	603	Risk Ratio (M‐H, Fixed, 95% CI)	1.11 [0.46, 2.66]
3 Referral to hospital, no admission	1	361	Risk Ratio (M‐H, Fixed, 95% CI)	1.05 [0.48, 2.32]
4 Admission to hospital	1	361	Risk Ratio (M‐H, Fixed, 95% CI)	0.82 [0.56, 1.22]
5 Placental abruption	1	361	Risk Ratio (M‐H, Fixed, 95% CI)	0.19 [0.01, 3.98]
6 Caesarean section	1	361	Risk Ratio (M‐H, Fixed, 95% CI)	0.75 [0.44, 1.27]
7 Perinatal mortality	2	409	Risk Ratio (M‐H, Fixed, 95% CI)	1.92 [0.18, 21.03]
8 Birthweight <10th centile	1	242	Risk Ratio (M‐H, Fixed, 95% CI)	1.5 [0.73, 3.07]
9 Birthweight <2500g	1	361	Risk Ratio (M‐H, Fixed, 95% CI)	0.84 [0.42, 1.67]
10 Preterm delivery	1	242	Risk Ratio (M‐H, Fixed, 95% CI)	1.08 [0.46, 2.56]
11 Apgar at 5 min <7	1	361	Risk Ratio (M‐H, Fixed, 95% CI)	1.37 [0.53, 3.53]
12 Paediatric admission	1	361	Risk Ratio (M‐H, Fixed, 95% CI)	0.98 [0.69, 1.40]