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Table 1 Characteristics of colorectal cancer case and control subjects

From: Association of MUTYH Gln324His and APEX1 Asp148Glu with colorectal cancer and smoking in a Japanese population

Item Patients Controls P-value
  n % n %  
Number 68   121   
Gender      
   males 37 54.4 74 61.2 0.872a
   females 26 38.2 47 38.8  
   unknown 5 7.4 0 0.0  
Age      
   ~64 21 30.9 50 41.3  
   65~69 13 19.1 29 24.0  
   70~74 13 19.1 20 16.5  
   75~ 16 23.5 22 18.2  
   unknown 5 7.4 0 0.0  
   Mean ± S.D. 67.3 ± 10.9   67.4 ± 6.7   0.923b
Smoking status (Pack-years)      
   non-smokers (Pack-years = 0) 36 52.9 55 45.5 0.253a
   smokers (Pack-years > 0) 26 38.2 60 49.6  
   unknown 6 8.8 6 5.0  
Subsites      
   colon 40 58.8    
   rectum 23 33.8    
   unknown 5 7.4    
  1. a: X2 analysis
  2. b: Student's T-test