Additional file 1: Further Methods. The other patient-reported outcome (PRO) instruments included in this analysis. Table S1. Categories for change in anchor measure scores at weeks 4 and 12 – mean change. Table S2. Categories for change in anchor measure scores at weeks 4 and 12 – ROC curve. Table S3. Distribution of responses for PROMIS SD-SF-8b items. Table S4. Item-to-item correlation analysis. Table S5. Anchor evaluation: correlations between PROMIS SD-SF-8b total score and anchor change. Table S6. ROC curve analysis of PROMIS SD-SF-8b total score: responder versus non-responder