Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,938 questions · 1,994 findings · 246 reviews · Headline outcomes only

No studies found 490 · 24.6%GRADE not reported 71 · 3.6%Very low 669 · 33.6%Low 446 · 22.4%Moderate 264 · 13.2%High 54 · 2.7%

Supplemental IV crystalloid vs control IV crystalloid volume

Risk of unintended postoperative admission to hospital, reported dichotomously as admission to an inpatient unit of a participant after an intended ambulatory surgical procedure · participants aged 6 months or older undergoing surgical procedures under general anaesthesia

Supplemental IV crystalloid showed no clear difference in risk of unintended postoperative admission to hospital, reported… compared with control IV crystalloid volume (low certainty).

1 finding from 1 review

Intervention not reported

HIT in people undergoing major surgical procedures · people undergoing surgical procedures and treated with UFH or LMWH for prophylaxis of thrombotic events lasting at least 5 days

The intervention may leads to lower HIT in people undergoing major surgical procedures (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

Open surgical excision vs eccentric exercises

Participant global assessment of success (People who perceived their pain as none) · adult participants with patellar tendinopathy

Open surgical excision showed no clear difference in participant global assessment of success (People who perceived their… compared with eccentric exercises (low certainty).

1 finding from 1 review