A total information curve which included all 9 criteria from the final model showed that measurement precision was very similar in all 4 groups. To determine whether the two abuse criteria included in the analysis contributed information beyond that from the dependence items, an item information curve which excluded role failure and social/interpersonal problems was compared to the total information curve. The peaks were uniformly lower in all four groups in the curves which excluded abuse items, indicating that the abuse criteria contributed to identification of AUDs similarly in all groups. For example, the height of the peaks for women with no DUIs before and after excluding the abuse criteria were 5.8 and 4.1, respectively and for women with DUIs were 5.7 and 4.2 (data not shown, available on request). This indicates that the remaining abuse criteria contribute to identification of AUDs, over and above the 7 dependence criteria, and do so similarly across groups.
