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Table 1 Demographic characteristics of coke oven workers (COWs) and controls

From: Effects of a fruit-vegetable dietary pattern on oxidative stress and genetic damage in coke oven workers: a cross-sectional study

Characteristics Controls Topside COWs Other COWs
(n = 67) (n = 51) (n = 79)
Age (years)a 38.1 (7.5) 35.5 (8.3)* 37.8 (8.2)
BMI (kg/m2)b    
≤25 46 (69) 40 (78) 58 (73)
>25 21 (31) 11 (22) 21 (27)
Level of educationb    
 High school and below 57 (85) 46 (90) 73 (92)
 College and above 10 (15) 5 (10) 6 (8)
Cigarette smokingb    
 Nonsmoker 28 (42) 15 (29) 28 (35)
 Smoker 39 (58) 36 (71) 51 (65)
Alcohol drinkingb    
 Nondrinker 25 (37) 18 (35) 25 (32)
 Drinker 42 (63) 33 (65) 54 (68)
Working hours per daya 8.4 (1.1) 7.6 (0.7) 7.7 (0.8)
Years of servicea 10.2 (3.4) 6.9 (2.3)*** 7.6 (1.9)***
  1. *P < 0.05, ***P < 0.001 vs. control group.
  2. aArithmetic mean (standard deviation).
  3. bNumber (%).