CRP and ataxia telangiectasia: We did this by creating three different linear regression models of the form (Brain ∼ BMI), (Brain ∼ CRP), (Brain ∼ AT) where BMI, CRP, and AT are treated separately as predictors and cortical thickness (or subcortical volume) as the dependent variable at each of 180 cortical areas (or 7 subcortical structures) (Fig. 2).