Abstract
We evaluated geographic variation in type 1 and type 2 diabetes mellitus (T1DM, T2DM) in four regions of the United States.Data on 807 incident T1DM cases diabetes and 313 T2DM cases occurring in 2002–03 in South Carolina (SC) and Colorado (CO), 5 counties in Washington (WA), and an 8 county region around Cincinnati, Ohio (OH) among youth aged 10–19 years were obtained from the SEARCH for Diabetes in Youth Study. Geographic patterns were evaluated in a Bayesian framework.Incidence rates differed between the study regions, even within race/ethnic groups. Significant small-area variation within study region was observed for T1DM and T2DM. Evidence for joint spatial correlation between T1DM and T2DM was present at the county level for SC (rSC=0.31) and CO non-Hispanic Whites (rCO=0.40) and CO Hispanics (rCO=0.72). At the tract level, no evidence for meaningful joint spatial correlation was observed (rSC=−0.02; rCO=−0.02; rOH=0.03; and rWA=0.09).Our study provides evidence for the presence of both regional and small area, localized variation in type 1 and type 2 incidence among youth aged 10–19 years in the United States.
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