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 |