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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.