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Table 3 Best evidence synthesis guidelines

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

Strong evidence Provided by consistenta statistically significant findings in outcome
measures in at least two high quality RCTsb
Moderate evidence Provided by statistically significant findings in outcome measures
in at least one high quality RCTb
or
Provided by consistenta, statistically significant findings in outcome
measures in at least two medium quality RCTsb
Limited evidence Provided by statistically significant findings in at least one medium
quality RCTb
or
Provided by consistenta, statistically significant findings in outcome
measures in at least two low quality RCTsb
No or insufficient evidence If results of eligible studies do not meet the criteria for one of the
levels of evidence listed above (e.g. no statistically significant findings)
or
In case of conflicting (statistically significant positive and statistically significant negative) results among RCTs
or
In case of no eligible studies
  1. Best evidence synthesis guidelines as modified by Dorrestijn et a [50] from the synthesis by van Tulder et al. [45]
  2. Abbreviations: RCT randomized controlled trial
  3. a Findings are considered consistent if they point in the same direction
  4. b If the number of studies showing evidence is lower than 50% of the total number of studies found within the same category of methodological quality, we state no evidence