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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.