Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

637 questions · 714 findings · 96 reviews

No studies found 98 · 13.7%GRADE not reported 191 · 26.8%Very low 157 · 22%Low 161 · 22.5%Moderate 87 · 12.2%High 20 · 2.8%

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

Summary of findings table ‐ High‐dose dexamethasone (12 mg or higher) vs low‐dose dexamethasone (6 mg to 8 mg)

All‐cause mortality up to 30 days · hospitalised individuals with unknown vaccination status and a confirmed diagnosis of symptomatic COVID‐19

Summary of findings table ‐ High‐dose dexamethasone (12 mg or higher) showed no clear difference in all‐cause mortality up to 30 days compared with low‐dose dexamethasone (6 mg to 8 mg) (low certainty).

1 finding from 1 review

Summary of findings table ‐ High‐dose dexamethasone (12 mg or higher) vs low‐dose dexamethasone (6 mg to 8 mg)

All‐cause mortality up to 120 days · hospitalised individuals with unknown vaccination status and a confirmed diagnosis of symptomatic COVID‐19

It is very uncertain whether summary of findings table ‐ High‐dose dexamethasone (12 mg or higher) changes all‐cause mortality up to 120 days compared with low‐dose dexamethasone (6 mg to 8 mg) (very low certainty).

1 finding from 1 review

Summary of findings table ‐ High‐dose dexamethasone (12 mg or higher) vs low‐dose dexamethasone (6 mg to 8 mg)

Clinical improvement: discharged alive ( · hospitalised individuals with unknown vaccination status and a confirmed diagnosis of symptomatic COVID‐19

Summary of findings table ‐ High‐dose dexamethasone (12 mg or higher) showed no clear difference in clinical improvement: discharged alive ( compared with low‐dose dexamethasone (6 mg to 8 mg) (low certainty).

1 finding from 1 review

Summary of findings table ‐ High‐dose dexamethasone (12 mg or higher) vs low‐dose dexamethasone (6 mg to 8 mg)

Clinical worsening: need for invasive mechanical ventilation, or death at up to day 28 · hospitalised individuals with unknown vaccination status and a confirmed diagnosis of symptomatic COVID‐19

The review found no eligible studies for this question.

1 finding from 1 review

Higher circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration vs Lower circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration

Colorectal cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 1,25(OH)2D) for Colorectal cancer: OR 1.01 (95% CI 0.59 to 1.73), not statistically significant. Umbrella review outcome-level evidence grade: Suggestive.

1 finding from 1 review

Higher circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration vs Lower circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration

Breast cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 1,25(OH)2D) for Breast cancer: OR 0.99 (95% CI 0.68 to 1.44), not statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration vs Lower circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration

Colon cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 1,25(OH)2D) for Colon cancer: OR 0.88 (95% CI 0.57 to 1.35), not statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

Higher circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration vs Lower circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration

Aggressive prostate cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 1,25(OH)2D) for Aggressive prostate cancer: OR 0.75 (95% CI 0.48 to 1.17), not statistically significant. Umbrella review outcome-level evidence grade: Substantial effect unlikely.

1 finding from 1 review

Higher circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration vs Lower circulating 1,25-dihydroxyvitamin D (1,25(OH)2D) concentration

Prostate cancer · Adults (general population)

Meta-analysis of observational studies (higher vs lower 1,25(OH)2D) for Prostate cancer: OR 0.99 (95% CI 0.87 to 1.14), not statistically significant. Umbrella review outcome-level evidence grade: Substantial effect unlikely.

1 finding from 1 review

Removable appliance with palatal crib associated with high-pull chincup vs no treatment

Mandibular ramus growth · Children and adolescents (over 80% aged 16 years or younger at treatment start) with anterior open bite (lack of vertical overlap or…
1 finding from 1 review
  • Orthodontic and orthopaedic treatment for anterior open bite in children 2014 · Cochrane All outcomes
    End of treatment (12 months)
    Cephalometric data (SNA, Co-A, SNB, Ar-Go, Ar.GoMe, Co-Gn, ANB) were reported to be not significantly different between groups; effects were dento-alveolar rather than skeletal. No pooled estimate (Almeida 2005).
    1 study
    GRADE not reported

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

Small‐for‐gestational age · pregnant women and their infants..

Meta-analysis of observational studies (higher vs lower maternal 25(OH)D) for Small for gestational age: OR 0.54 (95% CI 0.44 to 0.67), statistically significant. Umbrella review outcome-level evidence grade: Suggestive.

1 finding from 1 review

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

Pre‐eclampsia · pregnant women and their infants..

Meta-analysis of observational studies (higher vs lower maternal 25(OH)D) for Pre-eclampsia: OR 0.56 (95% CI 0.39 to 0.80), statistically significant. Umbrella review outcome-level evidence grade: No conclusion.

1 finding from 1 review

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

Head circumference (mm) · pregnant women and their infants..

Meta-analysis of observational studies (higher vs lower maternal 25(OH)D) for Head circumference: WMD 0.05 (95% CI -0.24 to 0.34), not statistically significant. Umbrella review outcome-level evidence grade: Suggestive.

1 finding from 1 review

Removable appliance with palatal crib associated with high-pull chincup vs no treatment

Alteration of hyperdivergent growth pattern · Children and adolescents (over 80% aged 16 years or younger at treatment start) with anterior open bite (lack of vertical overlap or…
1 finding from 1 review
  • Orthodontic and orthopaedic treatment for anterior open bite in children 2014 · Cochrane All outcomes
    End of treatment (12 months)
    The angles (SN.GoGN, SN.PP, NS.Gn) and linear measures (AFA, AFP, AFAI) did not demonstrate significant alterations between groups; interventions did not produce significant changes in the skeletal maxillary or…
    1 study
    GRADE not reported

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

Birth length · pregnant women and their infants..

Meta-analysis of observational studies (higher vs lower maternal 25(OH)D) for Birth length: WMD 0.19 (95% CI -0.26 to 0.65), not statistically significant. Umbrella review outcome-level evidence grade: Substantial effect unlikely.

1 finding from 1 review