Findings

What do systematic reviews say?

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Evidence found and GRADE certainty

1,615 questions · 1,673 findings · 190 reviews · Headline outcomes only

No studies found 278 · 16.6%GRADE not reported 85 · 5.1%Very low 328 · 19.6%Low 460 · 27.5%Moderate 402 · 24%High 120 · 7.2%

Intervention not reported

All‐cause mortality · individuals with atrial fibrillation who are undergoing cardiac surgery

The intervention showed no clear difference in all‐cause mortality (low certainty).

1 finding from 1 review

Intervention not reported

Freedom from AF/AFL/AT off antiarrhythmic medications > 3 months · individuals with atrial fibrillation who are undergoing cardiac surgery

The intervention probably leads to higher freedom from AF/AFL/AT off antiarrhythmic medications > 3 months (moderate certainty).

1 finding from 1 review

Intervention not reported

Investigator‐defined adverse events · individuals with atrial fibrillation who are undergoing cardiac surgery

It is very uncertain whether the intervention changes investigator‐defined adverse events (very low certainty).

1 finding from 1 review

Intervention not reported

Pacemaker implantation4 · individuals with atrial fibrillation who are undergoing cardiac surgery

The intervention probably leads to higher pacemaker implantation4 (moderate certainty).

1 finding from 1 review

Intervention not reported

30‐day mortality4 · individuals with atrial fibrillation who are undergoing cardiac surgery

The intervention showed no clear difference in 30‐day mortality4 (low certainty).

1 finding from 1 review

Group antenatal care vs individual antenatal care (adjusted data)

Gestational age (preterm birth < 37 weeks) · pregnant women accessing prenatal care

Group antenatal care showed no clear difference in preterm birth (gestational age at time of birth less than 37 weeks'… compared with individual antenatal care (adjusted data) (moderate certainty).

1 finding from 1 review