Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

973 questions · 1,024 findings · 106 reviews

No studies found 235 · 22.9%GRADE not reported 59 · 5.8%Very low 207 · 20.2%Low 271 · 26.5%Moderate 177 · 17.3%High 75 · 7.3%

Staple foods fortified with vitamin A vs same unfortified staple foods

Clinical vitamin A deficiency (as defined by night blindness) · general population over 2 years of age

It is very uncertain whether staple foods fortified with vitamin A changes clinical vitamin A deficiency (defined as night blindness) compared with same unfortified staple foods (very low certainty).

1 finding from 1 review

Vitamin K antagonist (VKA) prophylaxis vs no prophylaxis

Mortality at 6 months: main analysis · ambulatory people with cancer without venous thromboembolism receiving systemic therapy

Vitamin K antagonist (VKA) prophylaxis showed no clear difference in mortality at 6 months: main analysis compared with no prophylaxis (moderate certainty).

1 finding from 1 review

Vitamin K antagonist (VKA) prophylaxis vs no prophylaxis

All‐cause mortality · ambulatory people with cancer without venous thromboembolism receiving systemic therapy

Vitamin K antagonist (VKA) prophylaxis showed no clear difference in mortality compared with no prophylaxis (moderate certainty).

1 finding from 1 review

Vitamin K antagonist (VKA) prophylaxis vs no prophylaxis

Pulmonary embolism · ambulatory people with cancer without venous thromboembolism receiving systemic therapy

It is very uncertain whether vitamin K antagonist (VKA) prophylaxis changes pulmonary embolism compared with no prophylaxis (very low certainty).

1 finding from 1 review

Vitamin K antagonist (VKA) prophylaxis vs no prophylaxis

Symptomatic DVT · ambulatory people with cancer without venous thromboembolism receiving systemic therapy

It is very uncertain whether vitamin K antagonist (VKA) prophylaxis changes symptomatic deep vein thrombosis compared with no prophylaxis (very low certainty).

1 finding from 1 review

Vitamin K antagonist (VKA) prophylaxis vs no prophylaxis

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

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

1 finding from 1 review

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 D plus calcium vs placebo or control

Persons with hypercalcaemia ‐ Vitamin D (D2, D3 or 25(OH)D) plus calcium (1 year estimate) · post‐menopausal women and older people at risk of osteoporotic fractures

Vitamin D [D2, D3 or 25(OH)D] plus calcium showed no clear difference in persons with hypercalcaemia ‐ Vitamin D (D2, D3 or 25(OH)D) plus… compared with control or placebo (low certainty).

1 finding from 1 review