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Definitions of levels of evidence [17]
| Level of evidence | Criteria |
|---|---|
| Strong evidence | Consistent results in HQ studies (n ≥ 2) |
| Moderate evidence | Consistent results among multiple MQ studies (n ≥ 2) |
| Limited evidence | Consistent results among multiple LQ studies (n ≥ 2) |
| Conflicting evidence | Inconsistent results among multiple studies |
| Very limited evidence | Only one LQ or MQ study or multiple VLQ studies |
HQ high-quality, MQ moderate-quality, LQ low-quality, VLQ very low quality
