The second analysis set was designed to validate the significant results revealed by the prior set. More specifically, it discarded the dichotomous variable, obesity, and the MANCOVA/ANCOVA design. The analysis instead tested partial correlations between BMI expressed as a continuous variable and selected P300 measures. Separate correlations were computed for the CP− and CP+ groups. Age and the total lifetime number of alcohol, cocaine, and opiate dependence were again included as covariates.
