Table 3 Comparison of Age-Adjusted Lung Cancer Incidence Rates per 100,000 from 1991 to 2010 by Radon Level in Nonmetropolitan Utah Counties

	Nonmetropolitan Counties: Moderate Radon			Nonmetropolitan Counties: High Radon			Model 1: Not adjusted for smoking	Model 2: Adjusted for smoking
	Rate	Count	Person-years	Rate	Count	Person-years	P-value	P-value
Overall incidence	29.2	760	3,040,765	41.7	870	2,257,102	< 0.0001*	< 0.0001*
Stage
Localized	5.3	139	3,040,765	6.9	146	2,257,102	0.02*	0.09
Regional	5.7	149	3,040,765	9.0	187	2,257,102	< 0.0001*	0.0008*
Distant	14.3	370	3,040,765	19.8	414	2,257,102	< 0.0001*	0.0008*
Unstaged	4.0	102	3,040,765	6.0	123	2,257,102	0.003*	0.02*
Sex
Male	36.3	446	1,530,326	57.3	558	1,131,906	< 0.0001*	< 0.0001*
Female	23.0	314	1,510,439	28.4	312	1,125,196	0.007*	0.11

Rates are adjusted to the 2000 United States standard population. Person-years shown here are not age-adjusted. *Indicate p-values <0.05 are significant. Moderate radon: 2–4 pCi/L (74 to 148 Bg/m3). High radon: > 4 pCi/L (> 148 Bg/m3)

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