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

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

  Exposed workers Controls
Subjects 109 82
Demographic characteristicsa   
   Ageb 43.32 ± 0.56 42.99 ± 0.73
   ≤ 40 years 34 30
   > 40 years 75 52
Occupational features   
   Duration of employmentb 14.34 ± 8.05 ---
   ≤ 10 years 36 ---
   > 10 years 73 ---
Smoking habits   
   Non smokers 54 42
   Smokers 55 40
   Cigarettes/dayc 18.85 ± 9.14 14.92 ± 8.11
  1. a All the subjects were males.
  2. b Age and duration of employment are expressed in years and reported as the group mean ± standard deviation.
  3. c The number of cigarettes smoked per day is reported as the mean ± standard deviation.