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Table 2 Characteristics of CRC study patients

From: Case-only study of interactions between metabolic enzymes and smoking in colorectal cancer

Gender  
   Male 105(50.7%)
   Female 102(49.3%)
Age (years)  
   < 54 28(13.5%)
   54–60 40(19.3%)
   61–71 70(33.8%)
   > 71 69(33.3%)
Cigarette smoking  
   Non-smoker 123(59.4%)
   Smoker 84(40.6%)
History (pack-years)  
≤ 35 51(24.6%)
> 35 31(15.0%)
No response 2 (1%)
Alcohol consumption  
   Non-drinker 147(71.0%)
   Moderate drinker (< 50 g ethanol/day) 35(16.9%)
   Heavy drinker (≥ 50 g ethanol/day) 24(11.6%)
   No response 1 (0.5%)
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