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Table 2 Demographic data on 60 male cement factory workers categorized into groups with high and low dust exposure

From: Cement dust exposure and acute lung function: A cross shift study

Variables High exposed Low exposed P
  (n = 40) (n = 20)  
Age (years)a 28.5 (8.2) 39.7 (7.9) < 0.0005c
Height(m)a 1.72 (0.075) 1.72 (0.048) 0.988c
Employment (years)a 6.8 (5) 9 (7) 0.124c
Primary education onlyb 7 (17.5) 6 (30) 0.326d
Current smokersb 4 (10) 2 (10) 1.000d
Non smokersb 36(90) 18(90) 1.000d
Ex-smokersb 4(11) 2(11) 1.000d
Past respiratory diseases 0(0) 0(0) 1.000d
  1. aMean (standard deviation). bNumber (%). cIndependent t-test. dFisher's exact test.