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

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

  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
  1. 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)