Gestational age (preterm birth < 37 weeks) · healthy pregnant women receiving calcium supplementation vs placebo or no treatment
Calcium supplementation showed no clear difference in preterm birth (a) Birth prior to 37 weeks compared with placebo or no treatment (maternal outcomes) (moderate certainty).
1 finding from 1 review
Preterm birth less than 34 weeks' gestation · healthy pregnant women receiving calcium supplementation vs placebo or no treatment
Calcium supplementation showed no clear difference in preterm birth (b) Birth prior to 34 weeks compared with placebo or no treatment (maternal outcomes) (moderate certainty).
1 finding from 1 review
Low birthweight · healthy pregnant women receiving calcium supplementation vs placebo or no treatment
Calcium supplementation showed no clear difference in low birthweight (< 2500 g) compared with placebo or no treatment (maternal outcomes) (moderate certainty).
1 finding from 1 review
Pre‐eclampsia · women who are not yet pregnant and women in the early stages of pregnancy
Calcium supplementation showed no clear difference in pre‐eclampsia compared with placebo (maternal outcomes) commencing before or early (low certainty).
1 finding from 1 review
Pre‐eclampsia, or pregnancy loss, or stillbirth (or combination) at any gestational age · women who are not yet pregnant and women in the early stages of pregnancy
Calcium supplementation showed no clear difference in pre‐eclampsia, or pregnancy loss, or stillbirth (or combination) at… compared with placebo (maternal outcomes) commencing before or early (low certainty).
1 finding from 1 review
Severe maternal morbidity and mortality index · women who are not yet pregnant and women in the early stages of pregnancy
Calcium supplementation showed no clear difference in severe maternal morbidity and mortality index compared with placebo (maternal outcomes) commencing before or early (low certainty).
1 finding from 1 review
Pregnancy loss or stillbirth at any gestational age · women who are not yet pregnant and women in the early stages of pregnancy
Calcium supplementation showed no clear difference in pregnancy loss or stillbirth at any gestational age compared with placebo (maternal outcomes) commencing before or early (low certainty).
1 finding from 1 review
Caesarean section · women who are not yet pregnant and women in the early stages of pregnancy
Calcium supplementation showed no clear difference in caesarean section compared with placebo (maternal outcomes) commencing before or early (low certainty).
1 finding from 1 review
Maternal adverse events · pregnant women and their infants..
The review found no eligible studies for this question.
1 finding from 1 review
no estimate extracted
Studies not reported
No studies found
Preterm birth · pregnant women and their infants..
Vitamin D + calcium supplementation may leads to higher preterm birth (less than 37 weeks' gestation) compared with placebo or no intervention (low certainty).
1 finding from 1 review
Low birthweight · pregnant women and their infants..
It is very uncertain whether vitamin D + calcium supplementation changes low birthweight (less than 2500 g) compared with placebo or no intervention (very low certainty).
1 finding from 1 review
Pre‐eclampsia · pregnant women and their infants..
Vitamin D + calcium supplementation probably leads to lower pre‐eclampsia compared with placebo or no intervention (moderate certainty).
1 finding from 1 review
Gestational diabetes · pregnant women and their infants..
It is very uncertain whether vitamin D + calcium supplementation changes gestational diabetes compared with placebo or no intervention (very low certainty).
1 finding from 1 review