Composite neuropsychological scores were computed to reduce the number of variables initially examined. A hybrid method (described by (Medina et al., 2007)) grouped measures into domains based on theoretical assumptions (Lezak et al., 2004), then average domain z-scores were computed. Goodness-of-fit was assessed by calculating Cronbach’s alpha coefficients for each domain. We derived 10 composite neuropsychological domains, with Cronbach’s alphas ranging from .47 to .96. The tests in each composite are listed in the Methods section, and in Table 2 along with descriptive statistics for each measure.
