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. 2015 Jan 29;7(2):115–124. doi: 10.1177/1758573214567702

Table 3.

Levels of evidence.

Strong evidence Consistent findings in multiple high quality RCTs (n > 2)
Moderate evidence Consistent findings among multiple lower quality RCTs and/or one higher quality RCT
Limited evidence Only one relevant low quality RCT
Conflicting evidence Inconsistent findings amongst multiple RCTs
No evidence from trials No RCTs

RCT, randomized controlled trial.