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Table 1 Selected characteristics of lung cancer cases and controls

From: Methylenetetrahydrofolate reductase polymorphisms and interaction with smoking and alcohol consumption in lung cancer risk: a case-control study in a Japanese population

Characteristics Cases (n = 462) Controls (n = 379) P
Age (year), median (IQR) 68 (62 - 73) 58 (48 - 65) <0.01
Male, n (%) 287 (62.1) 283 (74.7) <0.01
Smoking status, n (%)    <0.01
   Current smoker 198 (42.9) 129 (34.0)  
   Former smoker 111 (24.0) 41 (10.8)  
   Never smoker 153 (33.1) 209 (55.2)  
Pack years, median (IQR) 38 (0 - 58) 0 (0 - 34) <0.01
Moderate/heavy drinkers, n (%) 284 (61.5) 175 (46.2) <0.01
Exposure to environmental tobacco smoke among non-smokers, n (%) 99 (64.7) 135 (64.6) 0.98
Education, median (IQR) 12 (12 - 16) 16 (12 - 16) <0.01
Histology, n (%)    
   Adenocarcinoma 242 (52.4)   
   Squamous cell carcinoma 131 (28.4)   
   Small cell carcinoma 69 (14.9)   
   Large cell carcinoma 20 (4.3)   
  1. IQR, interquartile range