Table 1.
Baseline characteristics of FLOW cohort of COPD vs referent subjects
| Characteristic | COPD (n = 1,202) | Referents (n = 302) | P-value |
|---|---|---|---|
| Age in years, mean (SD) | 58.2 (6.2) | 58.5 (6.2) | 0.50 |
| Female, n (%) | 691 (57.4%) | 185 (61%) | 0.23 |
| Race/ethnicity, n (%) | 0.96 | ||
| White, non-Hispanic | 810 (67%) | 200 (66%) | |
| African-American | 206 (17%) | 57 (19%) | |
| Asian/Pacific Islander | 35 (3%) | 8 (3%) | |
| Hispanic | 111 (9%) | 28 (9%) | |
| Other | 40 (3%) | 9 (3%) | |
| Educational attainment, n (%) | <0.0001 | ||
| High school or less | 352 (29%) | 42 (14%) | |
| Some college | 524 (44%) | 95 (31%) | |
| College/graduate degree | 326 (27%) | 165 (55%) | |
| Smoking status, n (%) | <0.0001 | ||
| Never smoked | 165 (13%) | 158 (52%) | |
| Current smoker | 393 (33%) | 12 (4%) | |
| Ex-smoker | 644 (54%) | 132 (44%) |
Abbreviations: COPD, chronic obstructive pulmonary disease; FLOW, Function, Living, Outcomes and Work; SD, standard deviation.