Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

3,018 questions · 3,100 findings · 369 reviews · Headline outcomes only

No studies found 774 · 25%GRADE not reported 108 · 3.5%Very low 727 · 23.5%Low 840 · 27.1%Moderate 474 · 15.3%High 177 · 5.7%

clopidogrel plus aspirin vs aspirin

Minor bleeding · people with coronary disease, ischaemic cerebrovascular disease, peripheral arterial disease or at high risk of atherothrombotic disease

clopidogrel plus aspirin probably leads to higher minor bleeding compared with aspirin alone (moderate certainty).

1 finding from 1 review

Neonatal vitamin A supplementation vs control

Vitamin A deficiency · mortality and morbidity in term neonates

Neonatal vitamin A supplementation showed no clear difference in vitamin A deficiency (serum retinol < 0.70 micromol/L) at 6 weeks of… compared with control (high certainty).

2 findings from 1 review

Intervention not reported

Entomological inoculation rate · people living in malaria‐endemic areas

The review found no eligible studies for this question.

1 finding from 1 review

Cerebral NIRS oximetry vs no cerebral NIRS oximetry

Retinopathy of prematurity, any or severe (stage ≥ III) · patients with preventing morbidity and mortality in very preterm infants

It is very uncertain whether cerebral NIRS oximetry changes retinopathy of prematurity, any or severe (stage ≥ III) compared with no cerebral NIRS oximetry (very low certainty).

1 finding from 1 review

Active NRT vs placebo ‐ rs16969968 ‐ non‐Hispanic black or African American

6‐Month abstinence ‐ heterozygous or homozygous minor · people who smoke

Active NRT showed no clear difference in abstinence at 6 months ‐ heterozygous or homozygous minor compared with placebo ‐ rs16969968 ‐ non‐Hispanic black or African American (low certainty).

1 finding from 1 review