Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

948 questions · 998 findings · 100 reviews · Headline outcomes only

No studies found 233 · 23.3%GRADE not reported 40 · 4%Very low 203 · 20.3%Low 271 · 27.2%Moderate 176 · 17.6%High 75 · 7.5%

Vitamin K antagonist (VKA) prophylaxis vs no prophylaxis

Minor bleeding · ambulatory people with cancer without venous thromboembolism receiving systemic therapy

Vitamin K antagonist (VKA) prophylaxis probably leads to higher minor bleeding compared with no prophylaxis (moderate certainty).

1 finding from 1 review

Fondaparinux plus vitamin K antagonist vs usual care

Major bleeding · people > 18 years of age with a diagnosed deep vein thrombosis

Fondaparinux plus vitamin K antagonist showed no clear difference in major bleeding during the initial treatment compared with standard therapy (moderate certainty).

2 findings from 1 review

Vitamin C 1400 mg plus vitamin E 800 mg vs placebo

Severity of pain (use of opioid analgesics) · adults with sickle cell disease (adults with homozygous SCA or sickle beta 0 thalassaemia SCD)

It is very uncertain whether vitamin C 1400 mg plus vitamin E 800 mg changes severity of pain (use of opioid analgesics) compared with placebo (very low certainty).

1 finding from 1 review

Vitamin C 1400 mg plus vitamin E 800 mg vs placebo

Acute chest syndrome ( · adults with sickle cell disease (adults with homozygous SCA or sickle beta 0 thalassaemia SCD)

It is very uncertain whether vitamin C 1400 mg plus vitamin E 800 mg changes frequency of sickle cell‐related complications: acute chest syndrome compared with placebo (very low certainty).

1 finding from 1 review

Magnesium and vitamin E co‐supplementation vs placebo

Ulcer healing · people with diabetes and foot ulcers

It is very uncertain whether magnesium and vitamin E co‐supplementation changes ulcer healing (absolute change in individual parameters of ulcer… compared with placebo (very low certainty).

3 findings from 1 review

Magnesium and vitamin E co‐supplementation vs placebo

Ulcer healing (absolute change in individual parameters of ulcer dimensions over time: mean (SD) cm wound width reduction · people with diabetes and foot ulcers

It is very uncertain whether magnesium and vitamin E co‐supplementation changes ulcer healing (absolute change in individual parameters of ulcer… compared with placebo (very low certainty).

1 finding from 1 review