Table S1.
Demographic characteristics of former smokers (N=76) by group
| Characteristic | Former smokers (N=76)
|
p-value | |
|---|---|---|---|
| COPDb (n=48) | No COPDc (n=28) | ||
| Age (years) | |||
| Mean (SD) | 67.4 (7.9) | 62.0 (11.1) | 0.0284 |
| Range | 51–85 | 40–88 | |
| Sex, n (%) male | 24 (50) | 10 (36) | 0.2270 |
| Ethnic background, n (%) | |||
| Not Hispanic or Latino | 46 (98) | 28 (100) | 1.000 |
| Racial background, n (%)d | |||
| White | 44 (92) | 25 (89) | |
| Non-white | 4 (8) | 3 (11) | 0.7039 |
| Employment, n (%) | |||
| Employed (full- or part-time) | 10 (21) | 10 (21) | 0.0052 |
| Not employed/otherse | 38 (79) | 38 (79) | |
| Education status, n (%) | |||
| High school or less | 22 (46) | 22 (46) | 0.0934 |
| Some college, vocational training | 9 (19) | 9 (19) | |
| College degree or more | 17 (35) | 17 (35) | |
Notes:
a
English-speaking with informed consent and spirometry;
b
COPD, FEV1 60%–80% predicted and no history of exacerbations >12 months;
c
No known diagnosis or treatment for COPD and FEV1/FVC ≥0.70;
d
Subject self-identified; non-white: American Indian or Alaskan Native (1, 1), Asian (0, 1), Black or African American (1, 2), others (1, 0).
e
Others: homemaker, unemployed, and not specified.
Abbreviations: FEV1, forced expiratory volume in 1 second; FVC, forced vital capacity.