one-factor solution and the cannabis use criterion defined the mild end of the cannabis use disorder continuum in the IRT analysis. Further, the results of the IRT analyses showed that adding this cannabis use criterion did not substantially improve the fit of the original model that included only DSM-IV abuse and dependence criteria. However, the cannabis use criterion had an IRT discrimination parameter that was similar to all DSM-IV abuse and dependence criteria. More importantly, the aggregate criterion information curve associated with the model including the cannabis use criterion clearly demonstrated higher levels of information in the mild and moderate ranges of the severity continuum relative to the model without the cannabis use criterion, whereas both models retained similar information values at the severe end of the continuum. Taken together, these results strongly suggest the clinical and etiologic utility of the addition of a cannabis consumption criterion to the DSM-V.
