Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

518 questions · 558 findings · 63 reviews

No studies found 77 · 13.8%GRADE not reported 143 · 25.6%Very low 89 · 15.9%Low 137 · 24.6%Moderate 95 · 17%High 17 · 3%

Calcium vs placebo

Adverse events: renal calculi · white healthy postmenopausal women over 55 years

Calcium showed no clear difference in adverse events: renal calculi compared with placebo (low certainty).

1 finding from 1 review

Calcium vs placebo

Incidence: all cancers · white healthy postmenopausal women over 55 years

Calcium showed no clear difference in incidence: all cancers compared with placebo (low certainty).

1 finding from 1 review

Vitamin D plus calcium vs calcium

Healing of rickets (number) Definition: normal alkaline phosphatase and bone radiograph

It is very uncertain whether vitamin D plus calcium changes healing of rickets (number) Definition: normal alkaline phosphatase… compared with calcium (very low certainty).

1 finding from 1 review

Vitamin D plus calcium vs calcium

Adverse events (number) Asymptomatic hypercalcaemia and hypercalciuria

It is very uncertain whether vitamin D plus calcium changes adverse events (number) Asymptomatic hypercalcaemia and hypercalciuria compared with calcium (very low certainty).

1 finding from 1 review

Calcium supplementation/fortification vs placebo or no intervention

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

Calcium supplementation/fortification vs placebo or no intervention

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