Table S1.
Demography and severity of never-smoker COPD and smoker COPD
| Factors | Never-smoker COPD N (%) |
Smoker COPD N (%) |
P-value |
|---|---|---|---|
| Subjectsa | 258 | 562 | – |
| Sex, female | 187 (71.6) | 40 (7.5) | <0.0001 |
| Age, mean ± SE | 65.7±0.9 | 62.8±0.6 | 0.008 |
| COPD severity | 0.205 | ||
| Mild | 108 (44.8) | 247 (43.3) | |
| Moderate | 142 (53.5) | 282 (52.0) | |
| Severe | 6 (1.6) | 29 (4.4) | |
| Very severe | 0 | 3 (0.3) | |
Notes:
a
Patients with COPD were recruited from 5,784 subjects designated in Figure 1.
Abbreviations: COPD, chronic obstructive pulmonary disease; SE, standard error.