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What do systematic reviews say?

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Evidence found and GRADE certainty

6 questions · 6 findings · 1 reviews · Colorectal

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No studies found 1 · 16.7%GRADE not reported 0 · 0%Very low 3 · 50%Low 2 · 33.3%Moderate 0 · 0%High 0 · 0%

Preoperative enteral nutrition (standard formula) vs usual care or control

Infectious complications · people undergoing gastrointestinal surgery

It is very uncertain whether preoperative enteral nutrition (standard formula) changes infectious complications compared with usual care or control (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

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

Non‐infectious complications · people undergoing gastrointestinal surgery

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

1 finding from 1 review