Table 1 Demographic characteristics of 1115 pneumoconiosis patients seen in the Beijing Chaoyang Hospital by type of pneumoconiosis
From: Small airway dysfunction in pneumoconiosis: a cross-sectional study
|  | All | Asbestosis | Silicosis | Coal workers’ pneumoconiosis | Other pneumoconiosis | p Value |
|---|---|---|---|---|---|---|
n | 1115 | 339 | 341 | 303 | 132 | Â |
Age, yrs | 58.0 (50.0–67.0) | 67.0 (62.0–73.0) | 55.0 (48.0–65.0) | 53.0 (49.0–58.0) | 48.5 (44.0–59.8) |  < 0.001 |
Sex |  < 0.001 | |||||
 Men | 829 (74.3) | 153 (45.1) | 253 (74.2) | 299 (98.7) | 124 (93.9) |  |
 Women | 286 (25.7) | 186 (54.9) | 88 (25.8) | 4 (1.3) | 8 (6.1) |  |
BMI, kg/m2 | 25.1 (22.9–27.6) | 26.1 (24.1–28.9) | 24.5 (22.5–26.9) | 24.6 (21.8–26.9) | 24.6 (22.5–26.8) |  < 0.001 |
Smoking exposure, pack-yrs |  < 0.001 | |||||
 0 | 495 (44.4) | 221 (65.2) | 150 (44.0) | 84 (27.7) | 40 (30.3) |  |
 1–19 | 372 (33.4) | 65 (19.2) | 97 (28.4) | 143 (47.2) | 67 (50.8) |  |
  ≥ 20 | 248 (22.2) | 53 (15.6) | 94 (27.6) | 76 (25.1) | 25 (18.9) |  |
Cumulative pack-yrs | 15.0 (5.0–25.0) | 15.0 (5.0–30.0) | 18.4 (7.5–30.0) | 12.5 (4.8–22.5) | 10.0 (3.2–20.0) |  < 0.001 |
Duration of exposure, yrs | 12.0 (6.0–21.0) | 9.0 (5.0–23.0) | 13.9 (7.0–24.0) | 15.0 (7.0–20.0) | 12.0 (8.0–18.8) | 0.025 |
Stage of pneumo |  < 0.001 | |||||
 I | 599 (53.7) | 231 (68.1) | 156 (45.7) | 113 (37.3) | 99 (75.0) |  |
 II | 286 (25.7) | 91 (26.8) | 82 (24.0) | 88 (29.0) | 25 (18.9) |  |
 III | 230 (20.6) | 17 (5.0) | 103 (30.2) | 102 (33.7) | 8 (6.1) |  |