Additionally, within the domains of Verbal Story Memory, Self-Monitoring, and Psychomotor Speed and Coordination, certain demographic factors accounted for a statistically significant proportion of the variance (see Table 3). For instance, years of education was associated with performance in all three domains (i.e., participants with more years of education performed better on tests in these domains), and language of test administration was associated with performance in the Self-Monitoring domain (i.e., those participants tested in English tended to perform better on tests in this domain). In contrast, the use of other substances (tobacco and cannabis) did not account for a significant portion of the variability in performance between participants in the AD and control groups within any of the composite neuropsychological domains. Furthermore, a separate set of similar multiple regression analyses using alcohol dosage, rather than group status, as the primary predictor variable did not detect dose-dependent relationships in any of the composite domains.
