Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

108 questions · 126 findings · 4 reviews

No studies found 0 · 0%GRADE not reported 126 · 100%Very low 0 · 0%Low 0 · 0%Moderate 0 · 0%High 0 · 0%

Vitamin D compounds (supplementation) vs placebo or control

Bone pain · Adults with chronic kidney disease requiring dialysis

Meta-analysis of randomised trials of vitamin D supplementation for Bone pain: RR 0.29 (95% CI 0.03 to 2.63), not statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Vitamin D vs placebo or control

Bone mineral density · Older or community-dwelling adults

Meta-analysis of randomised trials of vitamin D supplementation for Bone mineral density, Community-dwelling adults: WMD -0.9 (95% CI -2.10 to 0.40), not statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

All cause mortality (in CKD patients) · Participants in observational studies

The meta-analysis of observational studies reported a RR of 0.88 (95% CI 0.81 to 0.93) for higher versus lower circulating vitamin D concentration.

1 finding from 1 review

Vitamin D vs placebo or control

Insulin resistance · Adults with diabetes

Meta-analysis of randomised trials of vitamin D supplementation for Insulin resistance (Diabetes): SMD 0.16 (95% CI -0.11 to 0.42), not statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Type 2 diabetes (prevalent) · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Type 2 diabetes (prevalent): OR 0.45 (95% CI 0.25 to 0.82), statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

All cause mortality · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for All cause mortality: HR 0.72 (95% CI 0.66 to 0.78), statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 25-hydroxyvitamin D (25(OH)D) concentration vs Lower circulating 25-hydroxyvitamin D (25(OH)D) concentration

Rectal cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 25(OH)D) for Rectal cancer: OR 0.50 (95% CI 0.29 to 0.88), statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review