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Table 2 Distribution of selected demographic variables and risk factors

From: Association of CYP2A6 gene deletion with cancers in Japanese elderly: an autopsy study

 All subjects (n = 1373)Cancer-free (n = 547)Cancer-bearing (n = 826)p-value*
Age at death, years†80.1 ± 9.0   
  ≥ 80、n (%)729 (53)300 (55)429 (52) 
  < 80644 (47)247 (45)397 (48)0.2946
Gender, n (%)
 Male743 (54)273 (50)470 (57) 
 Female630 (46)274 (50)356 (43)0.0128
Smoking, n (%)
 Non-smoker633 (46)256 (47)377 (45) 
 Smoker655 (48)245 (45)410 (50)0.2776
 Missing85 (6)46 (8)39 (5) 
Alcohol, n (%)
 Non-drinker833 (61)346 (63)487 (59) 
 Drinker456 (33)157 (29)299 (36)0.0143
 Missing84 (6)44 (8)40 (5) 
Cancer, n (%)
 0  547 (40) 
 1  604 (44) 
 2  178 (13) 
  ≥ 3  44 (3) 
Cancer sites, n (%)
 Gastric cancer  163 (12) 
 colorectal cancer  130 (10) 
 Lung cancer  128 (9) 
 Blood cancer  127 (9) 
  1. means ± SDs
  2. *p-value for Fisher’s exact probability test