Table 2.
Baseline characteristics of individuals with and without an increase in VLA disability at 1-year followupa
| Baseline characteristic | No increase in disability (80.1%, n=141) | Increase in disability (19.9%, n=35) | P valueb |
|---|---|---|---|
| Age, y, mean (SD) | 65.6 (6.1) | 66.7 (5.7) | .33 |
| Female, % (n) | 61.7 (87) | 74.3 (26) | .16 |
| Education ≤ high school, % (n) | 76.6 (108) | 82.9 (29) | .42 |
| Self-reported physician diagnosed | .003 | ||
| COPD | 36.9 (52) | 68.6 (24) | |
| Chronic bronchitis | 36.2 (51) | 17.1 (6) | |
| Asthma | 27.9 (38) | 14.3 (5) | |
| Nonrespiratory comorbid conditions, % (n) | .70 | ||
| 0 | 26.2 (37) | 20.0 (7) | |
| 1 | 39.7 (56) | 40.0 (14) | |
| 2+ | 34.0 (48) | 40.0 (14) | |
| Smoking status | .22 | ||
| Current smoker | 13.5 (19) | 20.0 (7) | |
| Former smoker | 55.3 (78) | 62.9 (22) | |
| Never smoked | 31.2 (44) | 17.1 (6) | |
| FEV1 % predicted, mean (SD) | 87.3 (18.9) | 77.9 (20.4) | .01 |
| FEV1/FVC, mean (SD) | 0.66 (0.15) | 0.59 (0.16) | .02 |
| VLA % affected, mean (SD) | 25.6 (30.3) | 25.6 (22.1) | .99 |
| Physically inactive, % (n) | 23.4 (33) | 42.9 (15) | .02 |
a
Increase in VLA disability defined as an increase in the proportion of VLAs affected by ≥10%
b
P-value from comparison of individuals with and without increases in disability using t-tests or χ2 analyses
Abbreviations: COPD, FEV1, FVC, VLA