A total of 40 temple workers and 25

A total of 40 temple workers and 25 control workers
participated in this study. All study subjects were nonsmoking,
healthy volunteers between the ages of 18–40.
Subjects of both genders were involved in the study.
The control subjects were age-, gender- and lifestylematched
workers in an occupational setting unrelated to
benzene, butadiene or PAH exposure. The work shift in
both groups of subjects was from 8 a.m. to 4 p.m. and for
5 days per week.