Jette, Alan M; McDonough, Christine M; Ni, Pengsheng; Haley, Stephen M; Hambleton, Ronald K; Olarsch, Sippy; Hunter, David J; Kim, Young-jo; Felson, David T
(BioMed Central, 2009-7-9)
INTRODUCTION. The objectives of this study were to develop a functional outcome instrument for hip and knee osteoarthritis research (OA-FUNCTION-CAT) using item response theory (IRT) and computer adaptive test (CAT) methods ...
