Table 4. Confounding effect of elevation on radon and UVB lung cancer associations.
Lung cancer incidence models for were fit for three sets of predictors: (model 1) radon/UVB and smoking; (model 2) radon/UVB, smoking, and elevation; and (model 3) radon/UVB and the optimal best subset predictors. The standardized UVB/radon coefficient (βz) [95% confidence interval] and UVB/radon p-value for coefficient negativity are reported.
| Radon | UVB | |||
|---|---|---|---|---|
| Model | βz | p-value | βz | p-value |
| 1 | −0.36 [−0.44, −0.28] | 1.90× 10−15 | −0.18 [−0.28, −0.08] | 3.08× 10−04 |
| 2 | −0.07 [−0.18, 0.04] | 0.120 | 0.05 [−0.04, 0.15] | 0.864 |
| 3 | −0.03 [−0.13, 0.07] | 0.308 | −0.01 [−0.10, 0.09] | 0.453 |