CAADSCalifornia Association of Adult Day Services
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For example, the item "I often blurt out answers before questions are completely asked" on Form A of the CAADS and the item "I answer questions before people finish asking them" on Form B are the two alternate versions designed to measure one of the behavioral criteria of impulsivity specified by DSM-IV TR (APA, 2000).
Although previous studies based on total scores obtained with the parallel forms of the CAADS have reported a high degree of equivalence between the two forms, the present results show that a large number of items exhibit differential item functioning.
The CAADS scale, used here as an illustration, has more than one item for each behavioral criterion, but this is not essential, as our approach to analyses requires only one pair of items to be evaluated for DIF.