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Major and minor criteria in assessing risk of bias
| Major Criteria | Minor Criteria |
|---|---|
| Was the control matched for time and attention by the instructors? | Was the randomization procedure described? |
| Were evaluators blinded to participant allocation? | Was allocation concealed? |
| Was there a description of withdrawals and dropouts? | Was an intent-to-treat analysis used? |
| Was attrition less than 20% at post-intervention assessment? | Did the trial evaluate the credibility, and if so, was it comparable? |
