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Table 1 Selected demographic characteristics of colorectal cancer cases and controls

From: Association of estrogen receptor betavariants and serum levels of estradiol with risk of colorectal cancer: a case control study

  Controls (n = 445) Cases (n = 390)  
Characteristics n % n % P-valuea
Age, years      
 ≤ 48 239 53.7 82 21.0 <0.001
 >48 206 46.3 308 79.0  
Smoking status      
 Ever 283 63.6 181 46.4 <0.001
 Never 162 36.4 209 53.6  
Alcohol drinking Status      
 Ever 292 65.6 137 39.0 <0.001
 Never 153 34.4 214 61.0  
  1. a P values were calculated from chi-square test.