The two-parameter IRT models were found to provide a better fit for models with and without the cannabis use criterion (BIC= 10834.77 and 8966.20, respectively) relative to the one-parameter Rasch models (10849.32 and 8972.41, respectively). Therefore, further discussion is limited to the two-parameter IRT models, and Table 1 presents these IRT parameters. As shown in Table 1, the BIC was also lower for the model that excluded the cannabis use criterion (8966.20) compared with the model that included this criterion (10834. 77), indicating a slightly better fit for the model that did not include the cannabis use criterion.
