Table 2.

Distribution of CYP1A1 alleles in cases and controls.

Allele	Controls, N (%)	Cases, N (%)	OR (CI)	p value
CYP1A1*1	452 (85.3)	168 (81.6)	1.0 (Ref.)
CYP1A1*2A	45 (8.5)	11 (5.3)	0.62 (0.3-1.2)	0.20
CYP1A1*2B	7 (1.3)	12 (5.8)	4.59 (1.4-12.6)	< 0.01
CYP1A1*2C	1 (0.2)	1 (0.5)	Nc
CYP1A1*3	2 (0.4)	2 (1)	Nc
CYP1A1*4	23 (4.3)	12 (5.8)	1.32 (0.7-2.9)	0.29

N: Number of alleles

OR (CI): Odds ratio with 95% confidence interval

nc: Non-calculable