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Table 4 Smoker and non-smoker wise comparison for blood naphthalene concentrations (μgL-1) in occupationally exposed workers and un-exposed (control) group

From: Biological Monitoring of Blood Naphthalene Levels as a Marker of Occupational Exposure to PAHs among Auto-Mechanics and Spray Painters in Rawalpindi

Descriptive Exposed Un-Exposed
  Car-Spray Painters (n = 20) Car-Mechanics (n = 20) Control (n = 20)
Sub-groups Smoker Non-smoker Smoker Non-smoker Smoker Non-smoker
Not detected (n/total) 2/12 4/8 3/9 4/11 1/3 14/17
Detected (n/total) 10/12 4/8 6/9 7/11 2/3 3/17
Median 140.3 27.0 280.9 192.3 109.5 17.7
Skewness 84.7 25.4 135.5 117.2 98.5 13.6
Minimum detected 72.8 54.1 79.1 53.7 109.6 56.0
Maximum detected 892.9 92.4 1980.6 1618.9 632.4 249.1
SMs vs NSMs* Significant at P < 0.05 Significant at P < 0.05 Significant at P < 0.001
  1. * Mann-Whitney U-test for comparison of median values between smokers and non-smokers