Table 2. Demographic characteristics of study population.
| Male (N=629) | Female (N=755) | Total (N=1,384) | |
|---|---|---|---|
| Age group (years), N (%) | |||
| 40-49 | 294 (46.7) | 330 (43.7) | 624 (45.1) |
| 50-59 | 185 (29.4) | 229 (30.3) | 414 (29.9) |
| 60-69 | 117 (18.6) | 156 (20.7) | 273 (19.7) |
| ≥70 | 33 (5.2) | 40 (5.3) | 73 (5.3) |
| Smoking amount (pack-year), N (%) | |||
| 0-10 | 93 (14.8) | 18 (2.4) | 111 (8.0) |
| 10-20 | 120 (19.1) | 7 (0.9) | 127 (9.2) |
| ≥20 | 269 (42.8) | 8 (1.1) | 277 (20.0) |
| Airflow obstruction, N (%) | |||
| Present* | 107 (17.0) | 42 (5.6) | 149 (10.8) |
| Absent | 522 (83.0) | 713 (94.4) | 1,235 (89.2) |
| TB scar, N (%) | |||
| Present† | 107 (17.0) | 60 (7.9) | 167 (12.1) |
| Absent | 522 (83.0) | 695 (92.1) | 1,217 (87.9) |
*, defined as observed FEV1/FVC <0.7; †, presence of any parenchymal change by tuberculosis listed in Table 1.