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. 2006 Feb 7;94(5):737–739. doi: 10.1038/sj.bjc.6602981

Table 1. Distribution of the HCC cases and matched controls by smoking habits, smoking period and smoking average number.

  Anti-HCV positive group
Anti-HCV negative group
  Case (%) Control (%) Control (%) Case (%)
Smoking habits
 Never smoker 13 (22.4) 241 (56.0) 16 (44.4) 1712 (58.9)
 Ex smoker 8 (13.8) 54 (12.6) 5 (13.9) 378 (13.0)
 Current smoker 30 (51.7) 116 (27.0) 15 (41.7) 688 (23.7)
 Unknown 7 (12.1) 19 (4.4) 0 (0.0) 129 (4.4)
         
 Total 58 (100.0) 430 (100.0) 36 (100.0) 2907 (100.0)
         
Smoking period (year)
 Never smoker 13 (27.1) 241 (60.9) 16 (44.4) 1712 (63.0)
 <35 13 (27.1) 54 (13.6) 6 (16.7) 467 (17.2)
 35 or more 22 (45.8) 101 (25.5) 14 (38.9) 538 (19.8)
         
 Total 48 (100.0) 396 (100.0) 36 (100.0) 2717 (100.0)
         
Smoking average number (cig/day)
 Never smoker 13 (26.5) 241 (59.2) 16 (45.7) 1712 (62.2)
 <10 0 (0.0) 13 (3.2) 1 (2.9) 85 (3.1)
 10 to 19 13 (26.5) 49 (12.0) 6 (17.1) 336 (12.2)
 20 or more 23 (47.0) 104 (25.6) 12 (34.3) 618 (22.5)
         
 Total 49 (100.0) 407 (100.0) 35 (100.0) 2751 (100.0)