Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

2,411 questions · 2,571 findings · 265 reviews

No studies found 543 · 21.1%GRADE not reported 169 · 6.6%Very low 676 · 26.3%Low 731 · 28.4%Moderate 399 · 15.5%High 53 · 2.1%

Telephone quitline referral vs usual care or no treatment

Health system telephone counselling vs quitline · smoking cessation in hospitalised patients

It is very uncertain whether telephone quitline referral changes health system telephone counselling vs quitline compared with no treatment or usual care (very low certainty).

1 finding from 1 review

Immune‐enhancing supplements (oral or enteral) vs usual care or control

Infectious complications · people undergoing gastrointestinal surgery

Immune‐enhancing supplements (oral or enteral) showed no clear difference in infectious complications recorded up to 30 days postdischarge compared with usual care or control (low certainty).

1 finding from 1 review

Oral nutritional supplements vs usual care or control

Infectious complications · people undergoing gastrointestinal surgery

It is very uncertain whether oral nutritional supplements changes infectious complications recorded up to 30 days postdischarge compared with usual care or control (very low certainty).

1 finding from 1 review