Table 1.
Screening population demographics and COPD status
| Characteristic | Non-COPD population | COPD cohorts
|
||||||
|---|---|---|---|---|---|---|---|---|
| Definitea
|
Possibleb
|
|||||||
| Smoking history
|
Smoking history
|
|||||||
| Current (n=36) | Former (n=32) | Never (n=69) | P-value | Current (n=172) | Former (n=95) | P-value | ||
| Sex, n (%) | <0.001c | 0.895d | ||||||
| Male | 2,905 (46.9) | 33 (91.7) | 27 (84.4) | 22 (31.9) | 153 (89.0) | 84 (88.4) | ||
| Female | 3,219 (53.1) | 3 (8.3) | 5 (15.6) | 47 (68.1) | 19 (11.0) | 11 (11.6) | ||
| Age (years) | ||||||||
| Mean ± SD | 56.6±11.7 | 59.4±13.5 | 64.3±12.4 | 63.4±12.2 | 0.217e | 51.1±9.9 | 56.4±11.2 | <0.001f |
| Median | 54.5 | 55.0 | 64.0 | 62.0 | 0.129g | 48.5 | 54.0 | <0.001g |
| Age group(years), n (%) | 0.142h | <0.002i | ||||||
| 40–49 | 2,027 (32.7) | 8 (22.2) | 2 (6.3) | 11 (15.9) | 97 (56.4) | 33 (34.7) | ||
| 50–59 | 1,978 (31.9) | 15 (41.6) | 10 (31.3) | 19 (27.5) | 47 (27.3) | 30 (31.6) | ||
| 60–69 | 1,166 (18.8) | 4 (11.1) | 10 (31.3) | 12 (17.4) | 15 (8.7) | 16 (16.8) | ||
| ≥70 | 1,025 (16.5) | 9 (25.0) | 10 (31.3) | 27 (39.1) | 13 (7.6) | 16 (16.8) | ||
Notes:
a
COPD reported to have been clinically diagnosed by a pulmonary specialist.
b
Respiratory symptoms that fulfill the epidemiological case definition of COPD and ever-smoker.
c
2×3 chi-square test.
d
2×2 chi-square test.
e
One-way ANOVA.
f
Two-sample t-test.
g
Kruskal–Wallis test.
h
3×7 chi-square test.
i
2×7 chi-square test.
Abbreviations: ANOVA, analysis of variance; SD, standard deviation.