Table 3

XPD codon 751 polymorphism and smoking, combined analysis

Smoking	XPD codon 751	Whites									Blacks			Whites and blacks combined
Smoking	XPD codon 751			Cases	Controls	OR_adj^a	95% CI	Test for interaction P	Cases	Controls	OR_adj^b	95% CI	Test for interaction P
Status
Never	Lys/Lys + Lys/Gln	27	64	1.0^ref			2	4	1.0^ref
Never	Gln/Gln	9	8	2.2	0.7–6.4		0	0	2.2	0.7–6.4
Ever	Lys/Lys + Lys/Gln	156	103	4.6	2.6–8.1		15	8	4.7	2.7–8.1
Ever	Gln/Gln	18	22	2.5	1.1–5.5	0.03	3	1	2.4	1.1–5.3	0.03
Years Smoked
0	Lys/Lys + Lys/Gln	27	64	1.0^ref			2	4	1.0^ref
0	Gln/Gln	9	8	2.3	0.8–6.8		0	0	2.3	0.8–6.7
1–34	Lys/Lys + Lys/Gln	69	69	3.1	1.7–5.7		9	6	3.2	1.8–5.8
1–34	Gln/Gln	10	16	1.9	0.7–4.9	0.06	0	0	1.9	0.8–4.9	0.05
>35	Lys/Lys + Lys/Glnl	87	34	7.4	3.9–14		5	2	7.2	3.9–14
>35	Gln/Gln	8	6	4.0	1.2–13	0.07	1	1	3.6	1.2–11	0.05

^a Adjusted for age and sex.
^b Adjusted for age, sex, and ethnicity.