What's in a score: A longitudinal investigation of scores based on item response theory and classical test theory for the Amsterdam Instrumental Activities of Daily Living Questionnaire in cognitively normal and impaired older adults.
Mark A DubbelmanMerel C PostemaRoos J JuttenJohn E HarrisonCraig W RitchieAndré AlemanFrank Jan de JongBenjamin D SchaletCaroline B TerweeWiesje Maria van der FlierPhilip ScheltensSietske A M SikkesPublished in: Neuropsychology (2023)
IRT-based scores were less affected by scale attenuation than CTT-based scores. With regard to responsiveness, IRT-based scores showed more signal than CTT-based scores in early disease stages, highlighting the IRT-based scores' superior suitability for use in preclinical populations. (PsycInfo Database Record (c) 2023 APA, all rights reserved).