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Table 1 Distributions of select characteristics in cases and control subjects

From: Tag SNPs in complement receptor-1 contribute to the susceptibility to non-small cell lung cancer

Variables    Cases (n = 470)    Controls (n = 470)  
No (%) No (%) P a
   Sex      0.832
   Male 324 68.9 328 69.8  
   Female 146 31.1 142 30.2  
   Age      0.470
   <50 84 17.9 96 20.4  
   50-59 177 37.7 187 39.8  
   60-69 129 27.4 111 23.6  
   ≥70 80 17.0 76 16.2  
   Smoking status      0.321
   Non-smoker 265 56.4 281 59.8  
   Smoker 205 43.6 189 40.2  
   Pack-year smoked      0.001
   <25 75 36.6 96 50.8  
   ≥25 130 63.4 93 49.2  
  1. aTwo-sided χ2 test.