Table 4

Distribution of CYP2A13 and CYP2A6 genotypes by tobacco smoking in controls

CYP2A13 genotype (%)PaCYP2A6 genotype (%)Pa
CCCT + TT*1/*1*1/*4 + *4/*4
Smoking status0.4160.204
 Nonsmokers (n = 457)381 (83.4)76 (16.6)399 (87.3)58 (12.7)
 Smokers (n = 334)b271 (81.1)63 (18.9)281 (84.1)53 (15.9)
Daily cigarette consumption0.6870.436
 < 15 cigarettes (n = 122)98 (80.3)24 (19.7)102 (83.6)20 (16.4)
 ≥ 15 cigarettes (n = 212)173 (81.6)39 (18.4)179 (84.4)33 (15.6)
Duration of smoking0.1150.664
 < 30 years (n = 135)104 (77.0)31 (23.0)115 (85.2)20 (14.8)
 ≥ 30 years (n = 199)167 (83.9)32 (16.1)166 (83.4)33 (16.6)
  • a P for χ2 test.

  • b Includes 42 former smokers.