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Table 1 Demographic characteristics, current and cumulative exposures to respirable dust and quartz among male workers in the coal mine

From: High prevalence of respiratory symptoms among workers in the development section of a manually operated coal mine in a developing country: A cross sectional study

Exposure status N Age (years)a Height (cm)a Tenure (yrs)a Ever smokerb Current smokerb Primary education onlyb Current Dusta (mg/m3) Current Quartza (mg/m3) Cumulative dust exposurea (mg·yr/m3) Cumulative quartz exposurea (mg·yr/m3)
Development 47 36.1(9.6) 166.0(6.3) 9.3(6.9) 7(15.2) 4(8.7) 43(91.5) 10.3 (16.3) 1.27(3.40) 136.3(129.0) 6. 7(6.3)
Mine 78 36.1(6.5) 165.4(6.4) 9.4(5.3) 24(30.8) 6(7.7) 71(91.0) 0.66(0.61) 0.03(0.10) 23.5(48.8) 1.2(2.4)
Other production workers 125 36.9(6.9) 163.9(6.5) 11.5(5.1) 30(24.0) 13(10.4) 108(86.4) 0.88(1.6) 0.10(0.46) 24.5(51.4) 1.5(2.6)
All 250 36.5(7.3) 164.7(6.4) 10.4(5.6) 61(24.5) 23(9.2) 222(88.8) 3.7(9.97) 0.48(2.06) 45.2(84.0) 2.4(4.1)
P   0.714c 0.098c 0.008c 0.148d 0.803d 0.752d <0.0001c <0.002c <0.0001c <0.0001c
  1. n: number of workers. aArithmetic mean (standard deviation). bNumber (percentage). cAnalysis of variance. dChi-square.
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