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What do systematic reviews say?

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Evidence found and GRADE certainty

535 questions · 545 findings · 129 reviews · Headline outcomes only

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No studies found 131 · 24%GRADE not reported 30 · 5.5%Very low 123 · 22.6%Low 136 · 25%Moderate 98 · 18%High 27 · 5%

Summary of findings table ‐ Combined mechanical and oral antibiotic bowel preparation vs mechanical bowel preparation alone

Postoperative ileus · Patients undergoing elective colorectal surgery

Summary of findings table ‐ Combined mechanical and oral antibiotic… showed no clear difference in incidence of postoperative ileus compared with mechanical bowel preparation alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Combined mechanical and oral antibiotic bowel preparation vs oral antibiotics

Anastomotic leakage · Patients undergoing elective colorectal surgery

Summary of findings table ‐ Combined mechanical and oral antibiotic… showed no clear difference in anastomotic leakage compared with oral antibiotics alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Combined mechanical and oral antibiotic bowel preparation vs oral antibiotics

All‐cause mortality · Patients undergoing elective colorectal surgery

Summary of findings table ‐ Combined mechanical and oral antibiotic… showed no clear difference in mortality compared with oral antibiotics alone (low certainty).

1 finding from 1 review

Summary of findings table ‐ Combined mechanical and oral antibiotic bowel preparation vs oral antibiotics

Postoperative ileus · Patients undergoing elective colorectal surgery

Summary of findings table ‐ Combined mechanical and oral antibiotic… showed no clear difference in incidence of postoperative ileus compared with oral antibiotics alone (low certainty).

1 finding from 1 review

Combined steroid and antibiotic therapy vs antibiotics alone

Complete resolution of endophthalmitis at 3 months' · eyes with acute endophthalmitis following an intraocular procedure (e.g. surgery, intravitreous injection)

It is very uncertain whether combined steroid and antibiotic therapy changes complete resolution of endophthalmitis at 3 months' compared with antibiotics alone (very low certainty).

1 finding from 1 review

Combined steroid and antibiotic therapy vs antibiotics alone

Visual acuity · eyes with acute endophthalmitis following an intraocular procedure (e.g. surgery, intravitreous injection)

Combined steroid and antibiotic therapy may leads to higher visual acuity 6/6 to 6/18 at 3 months' compared with antibiotics alone (low certainty).

2 findings from 1 review

Combined steroid and antibiotic therapy vs antibiotics alone

Adverse events at 3 to 12 months' · eyes with acute endophthalmitis following an intraocular procedure (e.g. surgery, intravitreous injection)

Combined steroid and antibiotic therapy showed no clear difference in adverse events at 3 to 12 months' compared with antibiotics alone (low certainty).

1 finding from 1 review

Topical prophylaxis vs no topical prophylaxis

Overall mortality ‐ topical plus systemic prophylaxis versus systemic prophylaxis alone · adults receiving mechanical ventilation for at least 48 hours

Topical prophylaxis showed no clear difference in overall mortality ‐ topical plus systemic prophylaxis versus… compared with no topical prophylaxis (low certainty).

1 finding from 1 review