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Table 1 Selected characteristics of the individuals

From: Methylation status of COX-2 in blood leukocyte DNA and risk of gastric cancer in a high-risk Chinese population

Variables Post-GC SG/mild CAG P a
n = 95 n =285
Age (%)    1.00
  < 60 40(42.1) 120(42.1)  
  ≥ 60 55(57.9) 165(57.9)  
Gender (%)    1.00
 Female 26(27.4) 78(27.4)  
 Male 69(72.6) 207(72.6)  
Smoking (%)    0.99
 Ever smoke 57(60.0) 173(60.7)  
 Never smoke 37(38.9) 112(39.3)  
 Missing 1(1.1)   
Drinking (%)    0.93
 Ever drink 48(50.5) 154(54.0)  
 Never drink 40(42.1) 131(46.0)  
 Missing 7(7.4)   
H. pylori infection (%)    <0.001
 Ever infected 84(88.4) 175(61.4)  
 Never infected 11(11.6) 110(38.6)  
  1. a χ2 test, P value for each covariate was estimated among participants without missing value in that variate