Questionnaire | Range of possible scores | Minimum clinically important difference (MCID) | Interpretation |
---|---|---|---|
St Georges’ Respiratory Questionnaire (SGRQ) | 0–100 | ±4 | Higher scores indicate worse QoL |
Chronic Respiratory Disease Questionnaire (CRQ) | 1–7 | ±0.5 | Lower scores indicate worse QoL |
Hospital Anxiety and Depression Scale (HADS) | 0–21 (for each domain) | ±1.5 | Higher scores indicate worse anxiety or depression |
Nottingham Extended Activity of Daily Living Score (NEADL) | 0–63 | ±5 | Lower scores indicate lower levels of activity |