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Summary of reliability and responsiveness indices
| Property | Index | NDI |
| Reliability | Cronbach alpha | 0.85 |
| Intraclass Correlation Coefficient | 0.93 (95%CI 0.84–0.97) | |
| Responsiveness | Spearman's correlation coefficient | 0.3 (P = 0.02) |
| Standard Error of Measurement | 0.64 | |
| Minimal Detectable Change | 1.78 |
