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Table 2 Mean frequency of each comet class per 100 cells (± standard deviation) and overall mean comet score (± standard deviation) of persons working in CNG/petrol pumps, automobile workshops (exposed group) and control group

From: Comet assay based DNA evaluation of fuel filling stations and automobile workshops workers from Khyber Pakhtunkhwa province, Pakistan

Comet class

0

1

2

3

4

TCS

Exposed group

21.6 ± 13.4

32.5 ± 14.2

15.8 ± 11.9

11.3 ± 9.9

18.7 ± 9.4

173.2 ± 50.1*

Control group

67.7 ± 13.0

16.2 ± 8.0

7.1 ± 4.4

5.3 ± 4.1

3.7 ± 2.3

61.0 ± 25.0

  1. *Difference significant relative to control group at P ≤ 0.001 (student’s t-test); TCS, total comet score