While no between-group differences emerged for any of the mood-related clinical variables, suggesting that the two groups were well matched in terms of their clinical state at the time of scanning, the question of whether heavier marijuana use might lead to increased emotionality was also explored. Correlations which examined the relationship between marijuana use, and included both frequency of use and total urinary THC concentration, and the clinical ratings of positive and negative symptoms (including all measures from the POMS, PANAS and BDI) did not reveal any statistically significant association, suggesting that marijuana use was not related to any of their clinical scores. Similarly, as a between-group difference was detected for number of alcoholic drinks in the last 30 days, with marijuana smokers having higher days of alcohol use relative to non-marijuana smoking controls, we also completed analyses to examine the potential relationship between alcohol use and marijuana use. The correlations for number of alcoholic drinks and number of smokes were not significant for parametric (r = .321; p = .243) or nonparametric (Kendall’s tau_b = .216; p = .313;
