Table 1 Psychometric properties of short HRQoL questionnaires for COPD patients
CCQ [11] | SF-CRDQ [12] | VSRQ [13] | CAT [14] | VQ11 [15] | |
|---|---|---|---|---|---|
Dimension | Symptom | Dyspnea | Total | Total | Total (HRQoL) |
Physical | Fatigue | (HRQoL) | (COPD impact) | Functional Psychological Social | |
Mental | Emotion | ||||
Total | Mastery | ||||
Items | 10 | 8 | 8 | 8 | 11 |
Answer | Frequency | Frequency or intensity | Frequency or intensity | Frequency or intensity | Intensity |
Likert 6 | Likert 6 | Likert 11 | Likert 6 | Likert 5 | |
Range | 0 - 6 (Total) | 1 - 14 per dimension | 0 - 80 | 0 - 40 | 11 - 55 |
Item reduction | From 77 to 10 | From 20 to 8 | From 18 to 8 | From 21 to 8 | From 24 to 11 |
Expert committee | Authors | Expert committee | Rasch | Confirmative factor analysis | |
Model | None | Principal component analysis | Principal component analysis | Rasch analysis | Structural equation modeling |
α Chronbach | .91 | .82 | .84 | .88 | .83 |
Test-retest | .94 | - | .77 | .80 | .72 |
r Total SGRQ | .71 | - | - | .80 | - |
r FEV1 | -.38 | -.07 to -.28 | - | - | - |