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What do systematic reviews say?

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Evidence found and GRADE certainty

3,454 questions · 3,562 findings · 816 reviews · Headline outcomes only

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No studies found 538 · 15.1%GRADE not reported 239 · 6.7%Very low 933 · 26.2%Low 1,041 · 29.2%Moderate 612 · 17.2%High 199 · 5.6%

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

All‐cause mortality at up to day 28 ‐ total · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in all‐cause mortality at up to day 28 ‐ total compared with placebo or standard care alone (high certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs human immunoglobulin

All‐cause mortality at up to day 28 · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in all‐cause mortality at up to day 28 compared with human immunoglobulin (low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

All‐cause mortality at up to day 28 · outpatients withmild disease

It is very uncertain whether summary of findings table ‐ Convalescent plasma changes all‐cause mortality at up to day 28 compared with placebo or standard care alone (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Clinical worsening: need for invasive mechanical ventilation, or death at up to day 28 · individuals with moderate to severe disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in clinical worsening: need for invasive mechanical ventilation, or… compared with placebo or standard care alone (high certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Admission to hospital or death within 28 days · outpatients withmild disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in admission to hospital or death within 28 days compared with placebo or standard care alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs placebo or usual care

Time to symptom resolution · outpatients withmild disease

Summary of findings table ‐ Convalescent plasma showed no clear difference in time to symptom resolution (absolute effect calculated for day 12) compared with placebo or standard care alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

All‐cause mortality at up to day 28 · outpatients withmild disease

It is very uncertain whether summary of findings table ‐ Convalescent plasma changes all‐cause mortality at up to day 28 compared with standard plasma (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

Admission to hospital or death within 28 days · outpatients withmild disease

Summary of findings table ‐ Convalescent plasma probably leads to lower admission to hospital or death within 28 days compared with standard plasma (moderate certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

All‐cause mortality at up to day 28 · individuals with moderate to severe disease

It is very uncertain whether summary of findings table ‐ Convalescent plasma changes all‐cause mortality at up to day 28 compared with standard plasma (very low certainty).

1 finding from 1 review

Summary of findings table ‐ Convalescent plasma vs standard plasma

Clinical worsening: need for invasive mechanical ventilation, or death at up to day 28 · individuals with moderate to severe disease

It is very uncertain whether summary of findings table ‐ Convalescent plasma changes clinical worsening: need for invasive mechanical ventilation, or… compared with standard plasma (very low certainty).

1 finding from 1 review

Tranexamic acid vs placebo

Risk of reoperation or repeat procedure for bleeding within 7 days · people aged 18 and over undergoing vascular surgery

It is very uncertain whether summary of findings: Tranexamic acid changes risk of reoperation or repeat procedure for bleeding within 7 days compared with placebo (very low certainty).

1 finding from 1 review

Summary of findings: Fibrin sealant vs usual care

All‐cause mortality up to 30 days · people aged 18 and over undergoing vascular surgery

It is very uncertain whether summary of findings: Fibrin sealant changes all‐cause mortality up to 30 days compared with usual care (very low certainty).

1 finding from 1 review