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Table 1 Characteristics of the groups of subjects involved in the study

From: Does the Low-level occupational exposure to volatile organic compounds alter the seasonal variation of selected markers of oxidative stress? A case–control study in nail technicians

  “Hot” season (May-July) “Cold” season (November-February)
Feature Nail Technicians Controls Nail Technicians Controls
Total number 66 101 79 44
Age [years] 33 [28–41] 32 [26–42] 34 [27–42] 34 [27–42]
Smoking status [never/ever] 26/40 [0.39/0.61]* 69/32 [0.68/0/32] 42/37 [0.53/0.47] 29/15 [0.66/0.34]
Pack-years 0.15 [0.0–22.5]** 0.0 [0.0–25.0] 0.0 [0.0–13.5] 0.0 [0.0–3.8]
  1. Numerical data for age and pack-years presented as median [range]. Smoking status [never/ever-smokers] expressed as absolute [relative] counts. Age and pack-years were tested for significant differences among the groups using the Kruskal-Wallis H test with subsequent post-hoc comparisons performed using the z test. Smoking status was tested for significant differences among the groups using the log-linear analysis of contingency tables
  2. * p < 0.0005 (nail technicians vs. control subjects during the “hot” season)
  3. ** p < 0.01 (nail technicians vs. control subjects during the “hot” season)