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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Prophylactic platelet transfusion prior to surgery vs alternative treatment

Serious adverse events (transfusion‐related adverse effects within 24 hours of the transfusion) · people with a low platelet count

It is very uncertain whether prophylactic platelet transfusion prior to surgery changes serious adverse events (transfusion‐related adverse effects within… compared with alternative treatments (very low certainty).

1 finding from 1 review

Chemical peeling vs needling

Participant‐assessed adverse events (short‐term) N of participants with positive adverse events · people with acne scars

It is very uncertain whether chemical peeling changes participant‐assessed adverse events (short‐term) N of participants… compared with needling (very low certainty).

1 finding from 1 review

Injectable fillers vs placebo or no treatment

Participant‐assessed adverse events (short‐term) N of participants with positive adverse events · people with acne scars

Injectable fillers showed no clear difference in participant‐reported adverse events (short‐term) N of participants… compared with placebo or no treatment (low certainty).

1 finding from 1 review

HALOPERIDOL vs first‐generation antipsychotics

Leaving the study early ‐ due to adverse effects (short term) · patients with schizophrenia

It is very uncertain whether haloperidol changes leaving the study early due to adverse events as a measure of… compared with first‐generation antipsychotics (very low certainty).

1 finding from 1 review

Adults: formoterol/ICS vs salmeterol/ICS

Asthma‐related non‐fatal serious adverse events · adults, chronic asthma: all‐cause mortality

Adults: formoterol/ICS showed no clear difference in asthma‐related non‐fatal serious adverse events ‐… compared with salmeterol/ICS (low certainty).

5 findings from 1 review
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Adults: formoterol/ICS vs salmeterol/ICS

All‐cause non‐fatal SAE ‐ Adults · adults, chronic asthma: all‐cause mortality

Adults: formoterol/ICS showed no clear difference in all‐cause non‐fatal serious adverse events ‐… compared with salmeterol/ICS (moderate certainty).

1 finding from 1 review

Antibiotics vs placebo compared

Adverse effects of antibiotics · children, aged 2 to 59 months, with WHO‐defined non‐severe pneumonia and wheeze

Antibiotic therapy showed no clear difference in treatment harms (adverse events or side effects associated with… compared with placebo compared to placebo (low certainty).

1 finding from 1 review

Injectable fillers vs placebo or no treatment

Investigator‐assessed adverse events (short‐term) N of participants with positive adverse events · people with acne scars

Injectable fillers showed no clear difference in investigator‐assessed adverse events (short‐term) N of participants… compared with placebo or no treatment (low certainty).

1 finding from 1 review

Non‐invasive brain stimulation and pharmacological intervention (combination) vs a pharmacological intervention and sham stimulation or usual care (single)

Adverse events: all ‐ central nervous system events (e.g. headache, seizures) (secondary outcome) · people with depression after stroke

It is very uncertain whether pharmacological intervention and non‐invasive brain stimulation… changes adverse events: all ‐ central nervous system events (e.g. headache,… compared with a pharmacological intervention and sham stimulation or usual care… (very low certainty).

1 finding from 1 review

Pharmacological interventions vs placebo

Gastrointestinal adverse events · people with depression after stroke

It is very uncertain whether pharmacological interventions changes adverse events: all ‐ gastrointestinal effects (e.g. constipation,… compared with placebo (very low certainty).

1 finding from 1 review

Fecal microbiota transplantation vs control

Any adverse events with use of FMT for maintenance of remission in UC (RR > 1 favors the control) · Patients with quiescent ulcerative colitis

It is very uncertain whether fecal microbiota transplantation changes any adverse events with use of FMT for maintenance of remission in… compared with control (very low certainty).

1 finding from 1 review

Corticosteroids vs no corticosteroid use

Number and nature of adverse events secondary to corticosteroid use (hospital‐acquired infection) · individuals with influenza

It is very uncertain whether corticosteroid therapy changes number and nature of adverse events secondary to corticosteroid use… compared with no corticosteroid therapy (very low certainty).

1 finding from 1 review