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Table 2 Levels of Quality

From: Specific or general exercise strategy for subacromial impingement syndrome–does it matter? A systematic literature review and meta analysis

Underlying methodology Quality rating
Randomized trials; or double-upgraded observational studies. High
Downgraded randomized trials; or upgraded observational studies. Moderate
Double-downgraded randomized trials; or observational studies. Low
Triple-downgraded randomized trials; or downgraded observational studies; or case series/case reports. Very low
  1. Adopted from Cochrane Handbook [42]: Levels of quality of a body of evidence in the GRADE approach