Table 1 Distribution characteristics of coal miners in 2015 and 2016
Variable | 2015 n(%) | 2016 n(%) |
|---|---|---|
Sex | ||
Female | 1029 (9.3) | 1318 (10.5) |
Male | 10,032 (90.7) | 11,279 (89.5) |
Age, years | ||
≤ 30 | 1428 (12.9) | 1512 (12.0) |
31–40 | 2462 (22.3) | 2794 (22.2) |
41–50 | 4068 (36.8) | 5031 (39.9) |
> 50 | 3103 (28.0) | 3260 (25.9) |
Years of dust exposure | ||
≤ 10 | 4709 (42.6) | 5640 (44.8) |
11–20 | 2452 (22.2) | 2222 (17.6) |
> 20 | 3900 (35.2) | 4735 (37.6) |
Smoking | ||
No | 5431 (49.1) | 6034 (47.9) |
Yes | 5630 (50.9) | 6563 (52.1) |
Drinking | ||
No | 3953 (35.7) | 3423 (27.2) |
Yes | 7108 (64.3) | 9174 (72.8) |
Working types | ||
Ground auxiliary | 5630 (50.9) | 6762 (53.7) |
Tunneling | 1757 (15.9) | 1514 (12.0) |
Coal extraction | 919 (8.3) | 795 (6.3) |
Pulverized coal | 1520 (13.7) | 1585 (12.6) |
Underground auxiliary | 1235 (11.2) | 1941 (15.4) |
Size of mine | ||
Large | 7368 (66.6) | 7680 (61.0) |
Medium | 2443 (22.1) | 2307 (18.3) |
Small | 1250 (11.3) | 2610 (20.7) |