Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

513 questions · 543 findings · 92 reviews · Headline outcomes only

No studies found 101 · 18.6%GRADE not reported 29 · 5.3%Very low 151 · 27.8%Low 150 · 27.6%Moderate 92 · 16.9%High 20 · 3.7%

Psychological therapy vs enhanced or structured care

Secondary outcome: acceptability of treatment · people with somatoform disorders and medically unexplained physical symptoms

Psychological therapy showed no clear difference in acceptability 1 ‐ proportion of participants withdrawing during… compared with enhanced or structured care (moderate certainty).

1 finding from 1 review

Hand hygiene vs control

Composite of acute respiratory illness, influenza‐like illness, laboratory‐confirmed influenza · general population and healthcare workers

Hand hygiene may leads to lower composite of acute respiratory illness, influenza‐like illness,… compared with control (low certainty).

1 finding from 1 review

Medical/surgical masks vs no masks

Viral respiratory illness ‐ laboratory‐confirmed influenza/SARS‐CoV‐2 · general population

Medical/surgical masks showed no clear difference in viral respiratory illness ‐ laboratory‐confirmed influenza/SARS‐CoV‐2 compared with no masks (moderate certainty).

1 finding from 1 review

N95 respirators vs medical/surgical masks

Viral respiratory illness ‐ laboratory‐confirmed influenza · general population and healthcare workers

N95 respirators showed no clear difference in viral respiratory illness ‐ laboratory‐confirmed influenza compared with medical/surgical masks (moderate certainty).

1 finding from 1 review