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Table 3 Blood naphthalene concentration (μgL- 1) of 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
  Total (n = 60) Painters (n = 20) Mechanics (n = 20) Control (n = 20)
Not detected (n/total) 28/60 6/20 7/20 15/20
Detected (n/total) 32/60 14/20 13/20 5/20
Median * 155.9 131.8 P 333.0 M 114.1 C
Skewness 2.2 2.0 1.2 1.8
Minimum detected 56.0 54.1 53.7 56.0
Maximum detected 1980.6 892.9 1980.6 632.4
  1. *Comparisons (Mann-Whitney U-test) of blood naphthalene levels for: P = Painters, M = Mechanics, C = Control. P = 0.168 for P vs C; P < 0.001 for M vs C; and P < 0.005 for M vs P.