Table 2.
Psychometric Properties of Select QOL-B and NTM Symptoms Domains for 228 Patients Initiating Treatment for MAC-PD
| Measure and HRQoL Domain | Mean Scores | Floor Effect (Score = 0) | Ceiling Effect (Score = 100) | Cronbach’s α |
|---|---|---|---|---|
| QOL-B | ||||
| Respiratory symptoms | 64.7 ± 17.0 | 0 (0) | 1 (0.4) | 0.85 |
| Physical functioning | 58.9 ± 33.0 | 17 (7.5) | 38 (16.7) | 0.94 |
| Vitality | 59.0 ± 13.6 | 0 (0) | 2 (0.9) | 0.81 |
| Health perception | 47.3 ± 17.7 | 1 (0.4) | 1 (0.4) | 0.81 |
| NTM symptoms | 78.5 ± 16.6 | 0 (0) | 14 (6.2) | 0.71 |
Data are presented as No. (%) or mean ± SD, unless otherwise indicated. Domain score range is 0-100, with higher being better. N = 185 for respiratory symptoms domain Cronbach’s α calculation only because 16% of patients skipped the sputum color question because it was not applicable (ie, lack of sputum production). HRQoL = health-related quality of life; MAC-PD = Mycobacterium avium complex pulmonary disease; NTM = nontuberculous mycobacteria; QOL-B = Quality of Life-Bronchiectasis.