Table 4.
—Prevalence of Increases in Disability from Time 1 to Time 2
| Disability Measure | Total Cohort | COPD | Chronic Bronchitis |
| % VLAs affected | |||
| % (No.) with increase | 18.6 (71) | 21.5 (43) | 15.5 (28) |
| Odds of increase in disability, OR (95% CI)a | |||
| Unadjusted | … | 1.5 (0.9, 2.5) | … |
| Adjustedb | … | 1.3 (0.7, 2.4) | … |
| % VLAs unable to perform | |||
| % (No.) with increase | 8.1 (31) | 12.0 (24) | 3.9 (7) |
| Odds of increase in disability, OR (95% CI)a | |||
| Unadjusted | … | 3.4 (1.4, 8.1) | … |
| Adjustedb | … | 1.9 (0.7, 5.4) | … |
| Mean VLA difficulty | |||
| % (No.) with increase | 16.3 (62) | 19.5 (39) | 12.7 (23) |
| Odds of increase in disability, OR (95% CI)a | |||
| Unadjusted | … | 1.7 (1.0, 2.9) | … |
| Adjustedb | … | 1.3 (0.7, 2.6) | … |
Increase in disability defined as having a 0.5 SD increase in disability scores between Time 1 and Time 2. See 1, Tables 2, and 3 for expansion of abbreviations.
a
Reference for analysis is chronic bronchitis group.
b
Adjusted for age, sex, race, education, smoking status, comorbidities, and COPD Severity Score.