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Table 1 Distribution characteristics of coal miners in 2015 and 2016

From: Effects of occupational exposure to dust on chest radiograph, pulmonary function, blood pressure and electrocardiogram among coal miners in an eastern province, China

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)