Table 2.

Association of selenoprotein-P (SEPP1) tertiles with lung cancer risk

	Cases (n)	Controls (n)	OR1	95% CI	OR2	95% CI
Blacks
Tertile 1	112	170	2.20	1.42, 3.40	2.42	1.48, 2.95
Tertile 2	80	149	1.78	1.15, 2.74	1.91	1.17, 3.12
Tertile 3	48	146	1.00	ref	1.00	ref
P for trend				0.0005		0.0006
Whites
Tertile 1	36	61	1.21	0.70, 2.10	1.13	0.60, 2.12
Tertile 2	39	77	1.04	0.62, 1.74	1.16	0.65, 2.08
Tertile 3	54	113	1.00	ref	1.00	ref
P for trend				0.50		0.69

NOTE: bold indicates statistically significant at P < 0.05.

Abbreviations: OR1, odds ratio from a conditional logistic regression model with no additional adjustment; OR2, odds ratio from a conditional logistic regression model additionally adjusted for smoking in dummy variables (comparing never smokers and former smokers to current smokers) and the continuous variable of pack-years ; CI, confidence interval