“…Last, we control for all confounders including indoor air radon, smoking, public water supply, residential tenure, race, gender and age with a single full model. To utilize the address-level exposure information from the groundwater radon estimates, 3 we conduct a logistic regression analysis on lung and stomach cancer cases that are assigned a 0/1 status based on their membership in a cluster 20,22 (referred hereinafter as the cluster membership model).…”