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Subjects' scorin g of questionnaires
| Questionnaire (n) | Score | ||||
| Very easy (1) | Easy (2) | Acceptable (3) | Difficult (4) | Very difficult (5) | |
| n (%) | n (%) | n (%) | n (%) | n (%) | |
| SF-36 (174) | 26 (15) | 80 (46) | 54 (31) | 9 (5) | 5 (3) |
| SGRQ (174) | 22 (13) | 79 (45) | 55 (32) | 13 (7) | 5 (3) |
| EQ-5D (174) | 18 (10) | 70 (40) | 51 (29) | 28 (16) | 7 (4) |
| WPAI-COPD (173) | 22 (13) | 79 (46) | 43 (25) | 17 (10) | 12 (7) |
| HS-COPD (173) | 8 (5) | 34 (20) | 49 (28) | 46 (27) | 36 (21) |
