Table 1 Demographic Characteristic of subjects
|  | COPD quitting smoking ≤ 5 years (N = 72) | COPD quitting smoking > 5 years (N = 53) | P value |
|---|---|---|---|
Sex, N (%) | Â | Â | / |
Male | 72 (100.0) | 53 (100.0) | |
Female | 0 (0.0) | 0 (0.0) | |
Age, year | 66.1 ± 8.1 | 66.91 ± 8.8 | 0.616 |
BMI, kg/m2 | 22.6 ± 3.3 | 23.0 ± 3.5 | 0.444 |
Education, N (%) | Â | Â | Â |
Illiteracy | 9 (12.5) | 13 (24.5) | 0.374 |
Primary school graduate | 27 (37.5) | 16 (30.2) | |
Junior high school graduate | 27 (37.5) | 18 (34.0) | |
Senior high school graduate | 9 (12.5) | 6 (11.3) | |
Occupation, N (%) | Â | Â | 0.685 |
Worker | 14 (19.4) | 13 (24.5) | |
Farmer | 36 (50.0) | 21 (39.6) | |
Retirement | 21 (29.2) | 18 (34.0) | |
Self-employed | 1 (1.4) | 1 (1.9) | Â |
Smoking amount, pack-year | 11.3 ± 3.8 | 9.8 ± 2.4 | 0.008 |
Smoking Cessation Time, y | 3.7 ± 1.4 | 9.3 ± 3.1 | 0.000 |
Occupational exposure, N (%) | 4 (5.6) | 5 (9.4) | 0.493 |
Occupational exposure time, year | 0.8 ± 4.6 | 2.7 ± 8.6 | 0.142 |
Biomass exposure, N (%) | 13 (18.1) | 9 (17.0) | 1.000 |
Biomass exposure time, year | 6.7 ± 14.7 | 6.5 ± 14.6 | 0.938 |
Prior respiratory diseases, N (%) | 5 (6.9) | 3 (5.7) | 1.000 |