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| CYP2A6 genotypes | Number of subjects | ||
|
| |||
| Exposed | Unexposed | Total | |
| CYP2A6*1A/*1A | 9 (53%) | 8 (47%) | 17 (100%) |
| CYP2A6*1A/*1B | 21 (47%) | 24 (53%) | 45 (100%) |
| CYP2A6*1B/*1B | 16 (53%) | 14 (47%) | 30 (100%) |
| CYP2A6*1A/*4C | 7 (35%) | 13 (65%) | 20 (100%) |
| CYP2A6*1B/*4C | 12 (63%) | 7 (37%) | 19 (100%) |
| CYP2A6*4C/*4C | 4 (50%) | 4 (50%) | 8 (100%) |
