Furthermore, none of the relations between trait level, traitedness, and their interaction with % of drinking days and drinks per drinking day at outcome, either post-therapy or at one-year follow up were significant, suggesting that alcohol severity does not relate to drinking outcomes, regardless of the degree to which participants fit this continuum. There were also no relations between trait level, traitedness, and their interaction on outcomes within each of the treatment modalities, or in the prediction of change in drinking patterns (controlling for baseline values) within or across treatment groups. Consistent with these results, alcohol severity markers used in the original study (i.e., alcohol involvement and severity) were also largely unrelated to drinking outcomes (Project MATCH Research Group, 1997a). In addition, although some evidence suggested a severity by treatment arm interaction in predicting treatment effects in the original study, such an interaction was not present using the empirically-derived continuum in the current study.
