Table 1. Summary of Poisson regressions of the effect of arsenic concentration (ppm) on county-level lung cancer incidence rates in the U.S. in an unadjusted model and a model adjusted for both smoking and median county income.

Model and Variable	Coefficient	Std. Error	Odds Ratio (95%CI)	P-value	N
Unadjusted Model
Arsenic	0.0045	1.9×10−6	1.004 (1.004–1.004)	P<0.0001	742
Adjusted Model
Arsenic	0.0039	1.9×10−6	1.004 (1.004–1.004)	P<0.0001	585
Smoking	1.80	0.0002	6.061 (6.059–6.064)	P<0.0001	585
Median Income	−3.54×10−6	1.31×10−9	0.999 (0.999–0.999)	P<0.0001	585