Baseline characteristics among adults with COPD by follow-up status
| Cohort (n=1051) | No follow-up (n=151) | p-Value | |
| Age (mean years, SD) | 58.3 (6.2) | 57.6 (6.4) | 0.19 |
| Female sex (n, %) | 620 (59%) | 71 (47%) | 0.006 |
| Race (white, non-hispanic) | 725 (69%) | 87 (58%) | 0.006 |
| Educational attainment (n, %) | |||
| High school or less | 300 (29%) | 51 (34%) | 0.03 |
| Some college | 453 (43%) | 72 (48%) | |
| College degree+ | 298 (28%) | 28 (19%) | |
| Household income (n, %)* | |||
| Low income (<$20K) | 103 (9.8%) | 26 (17%) | 0.064 |
| Medium income ($20–80K) | 614 (58%) | 85 (56%) | |
| High income (>$80K) | 247 (24%) | 29 (19%) | |
| Smoking history (n, %) | |||
| Past smoker | 571 (54%) | 73 (48%) | 0.032 |
| Current smoker | 330 (31%) | 63 (42%) | |
| Never smoker | 150 (14%) | 15 (10%) | |
| Forced expiratory volume in 1 s | 1.80 (0.77) | 1.77 (0.81) | 0.67 |
Proportions are column %.
Forced expiratory volume in 1 s per cent was 63% in both groups. The proportion of subjects who were GOLD Stage II or higher was similar in both groups (61%).
↵* A minority of all subjects (8%) declined to report their income.