Level of evidence for risk factors for new-onset atrial fibrillation
| Level of evidence | Criteria |
| Strong evidence | Consistent findings in ≥2 high quality studies (adapted NOS score 8–9) AND no conflicting studies |
| Moderate evidence | Consistent findings in 1 high quality study AND ≥1 acceptable quality study (adapted NOS score 6–7) AND no conflicting studies |
| Weak evidence | Consistent findings in ≥3 low quality studies (adapted NOS score ≤5 OR ≥2 acceptable quality studies OR 1 high quality study in isolation |
NOS, Newcastle-Ottawa Scale.