A statewide investigation of geographic lung cancer incidence patterns and radon exposure in a low-smoking population

BMC Cancer

Table 2 Comparison of Age-Adjusted Lung Cancer Incidence Rates per 100,000 from 1991 to 2010 in Metropolitan and Nonmetropolitan Utah Counties by Stage and Sex

	Metropolitan			Nonmetropolitan			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	29.7	8302	40,106,205	34.8	1630	5,297,867	<.0001*	0.19
Stage
Localized	5.2	1462	40,106,205	6.0	285	5,297,867	0.02*	0.83
Regional	6.3	1792	40,106,205	7.2	336	5,297,867	0.04*	0.15
Distant	15.4	4317	40,106,205	16.7	784	5,297,867	0.02*	0.02*
Unstaged	2.7	731	40,106,205	4.9	225	5,297,867	< 0.0001*	< 0.0001*
Sex
Male	39.5	4963	20,073,510	45.7	1004	2,662,232	< 0.0001*	0.24
Female	21.9	3339	20,032,695	25.4	626	2,635,635	0.0003*	0.46

Rates adjusted to the 2000 United States standard population. Person-years shown here are not age-adjusted. *Indicate p-values < 0.05 are significant