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Table 1 Modified risk of bias assessment

From: Identifying placebo responders and predictors of response in osteoarthritis: a protocol for individual patient data meta-analysis

  Yes No Unclear Comments
1. Was the randomisation procedure adequate?  
2. Was the treatment allocation adequately concealed?  
3. Were participants blinded to the intervention?  
4. Were physicians blinded to the intervention?  
5. Were outcome assessors blinded to the intervention?  
6. Incomplete outcome data: Is the attrition rate <15 %?  
7. Are all pre-specified outcomes of interest reported in the pre-specified way?  
8. Was intention-to-treat analysis used?  
9. Were the treatment and control group similar at baseline?