Poster 19 using differential item functioning to determine unidimensionality of the icf activity item bank: Assessing responses across different diagnostic groups. Ying-Chih Wang, OT (Univ Florida, Gainesville, FL), Craig A. Velozo, PhD, Leigh A. Lehman, BS, Sandra Piantieri, OTR-L, Jamie Pomeranz, MHS, Katherine Byers, MHS, Jia-Hwa Wang, OT, Pey-Shan Wen, BS

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