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Table 3 Occupational characteristics of coal miners with different probability values of output(%)

From: Identification and classification of high risk groups for Coal Workers' Pneumoconiosis using an artificial neural network based on occupational histories: a retrospective cohort study

Variable
Name
Category The probability value of output among coal miners without CWP
   <0.001
(n = 7959)
0.001-
(n = 5024)
0.015-
(n = 1292)
0.1-
(n = 144)
Bir (7)Before 1930 0(0.00) 93(1.85) 97(7.51) 11(7.64)
  (6)1930- 13(0.16) 340(6.77) 269(20.82) 74(51.39)
  (5)1940- 84(1.05) 375(7.46) 356(27.55) 56(38.89)
  (4)1950- 643(8.08) 2436(48.49) 570(44.12) 3(2.08)
  (3)1960- 4439(55.77) 1729(34.41) 0(0.00) 0(0.00)
  (2)1970- 2685(33.73) 51(1.01) 0(0.00) 0(0.00)
  (1)After 1980 95(1.19) 0(0.00) 0(0.00) 0(0.00)
Age (7)< 20 4011(50.39) 1943(38.67) 320(24.77) 54(37.50)
  (6)20- 3088(38.80) 1985(39.51) 650(50.31) 63(43.75)
  (5)25- 557(7.00) 869(17.30) 169(13.08) 19(13.19)
  (4)30- 215(2.70) 122(2.43) 112(8.67) 5(3.47)
  (3)35- 71(0.89) 65(1.29) 28(2.17) 3(2.08)
  (2)40- 16(0.20) 34(0.68) 11(0.85) 0(0.00)
  (1)≥45 1(0.01) 6(0.12) 2(0.15) 0(0.00)
Year (7)Before 1950 0(0.00) 13(0.25) 15(1.16) 5(3.47)
  (6)1950- 3(0.04) 270(5.37) 307(23.76) 89(61.80)
  (5)1960- 23(0.29) 341(6.79) 354(27.40) 41(28.47)
  (4)1970- 423(5.31) 2084(41.48) 512(39.63) 7(4.86)
  (3)1980- 3779(47.48) 2282(45.42) 101(7.82) 2(1.39)
  (2)1990- 3727(46.83) 34(0.68) 3(0.23) 0(0.00)
  (1)After 2000 4(0.05) 0(0.00) 0(0.00) 0(0.00)
Job (4)Tunneling 1468(18.44) 2490(49.56) 861(66.64) 130(90.28)
  (3)Combining 182(2.29) 443(8.82) 45(3.48) 0(0.00)
  (2)Mining 1744(21.91) 943(18.77) 195(15.09) 10(6.94)
  (1)Helping 4565(57.36) 1148(22.85) 191(14.78) 4(2.78)
Time1 Duration of dust exposure 15.35 ± 5.85 20.57 ± 6.41 26.91 ± 8.01 25.70 ± 7.08
Time2 Duration of ex-dust exposure 0.69 ± 2.54 3.46 ± 6.51 8.30 ± 8.52 16.30 ± 9.25
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