Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

4,918 questions · 5,537 findings · 1,803 reviews

No studies found 1,309 · 23.6%GRADE not reported 440 · 7.9%Very low 1,560 · 28.2%Low 1,292 · 23.3%Moderate 751 · 13.6%High 185 · 3.3%

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Three infusions of natalizumab (300 mg) and two infusions of infliximab (5 mg/kg) vs placebo and two infusions of infliximab

Serious adverse events up to week 10 · Participants with active Crohn's disease despite current treatment with infliximab

Three infusions of natalizumab (300 mg) and two infusions of… showed no clear difference in serious adverse events up to week 10 compared with placebo and two infusions of infliximab (low certainty).

1 finding from 1 review

Tricyclic antidepressants vs placebo

Adverse events (at 4, 6 or 12 weeks) · adults with insomnia

Tricyclic antidepressants showed no clear difference in adverse events (at 4, 6 or 12 weeks) compared with placebo (low certainty).

1 finding from 1 review

PERPHENAZINE vs placebo

Adverse events: death ‐ not reported · patients with schizophrenia

The review found no eligible studies for this question.

1 finding from 1 review

Combination chemotherapy vs single‐agent chemotherapy

Toxicity ‐ early adverse events G3/4 · people with resectable stage II and III rectal cancer undergoing preoperative chemoradiation followed by surgery

Combination chemotherapy probably leads to higher toxicity ‐ early adverse events G3/4 compared with single‐agent chemotherapy (moderate certainty).

1 finding from 1 review

Summary of findings ‐ Erector spinae plane block vs serratus anterior plane block

Rates of block‐related adverse events · adults undergoing surgery with general anaesthesia

Summary of findings ‐ Erector spinae plane block showed no clear difference in rates of block‐related adverse events compared with serratus anterior plane block (low certainty).

1 finding from 1 review

Summary of findings ‐ Erector spinae plane block vs intercostal nerve block

Rates of block‐related adverse events · adults undergoing surgery with general anaesthesia

It is very uncertain whether summary of findings ‐ Erector spinae plane block changes rates of block‐related adverse events compared with intercostal nerve block (very low certainty).

1 finding from 1 review