Primary DNA damage and genetic polymorphisms for CYP1A1, EPHX and GSTM1 in workers at a graphite electrode manufacturing plant

Table 1 Demographic characteristics of the study population grouped according to exposure status.

	Exposed workers	Controls
Subjects	109	82
Demographic characteristics^a
Age^b	43.32 ± 0.56	42.99 ± 0.73
≤ 40 years	34	30
> 40 years	75	52
Occupational features
Duration of employment^b	14.34 ± 8.05	---
≤ 10 years	36	---
> 10 years	73	---
Smoking habits
Non smokers	54	42
Smokers	55	40
Cigarettes/day^c	18.85 ± 9.14	14.92 ± 8.11

^a All the subjects were males.
^b Age and duration of employment are expressed in years and reported as the group mean ± standard deviation.
^c The number of cigarettes smoked per day is reported as the mean ± standard deviation.

ISSN: 1471-2458