Fig. 2

Clusters of lung cancer cases found by different methods: a geographic variations of standardized incidence ratio, b Mapping of the log relative risks by the CAR model using hierarchical Bayesian spatial modeling without adjustment on the Townsend index of socioeconomic status, c SaTScan clusters of high risk without adjustment on the Townsend index, d Mapping of the log relative risks by the heterogeneity model using hierarchical Bayesian spatial modeling without adjustment on the Townsend index. Four risk levels were considered (lightest to darkest color)