Detecting functional decline from normal aging to dementia: Development and validation of a short version of the Amsterdam IADL Questionnaire.
Roos J Jutten, Carel FW Peeters, Sophie MJ Leijdesdorff, Pieter Jelle Visser, Andrea B Maier, Caroline B Terwee, Philip Scheltens, Sietske AM Sikkes
Alzheimers Dement (Amst) | Published : 2017
INTRODUCTION: Detecting functional decline from normal aging to dementia is relevant for diagnostic and prognostic purposes. Therefore, the Amsterdam IADL Questionnaire (A-IADL-Q) was developed: a 70-item proxy-based tool with good psychometric properties. We aimed to design a short version while preserving its psychometric quality. METHODS: Study partners of subjects (n = 1355), ranging from cognitively normal to dementia subjects, completed the original A-IADL-Q. We selected the short version items using a stepwise procedure combining missing data, Item Response Theory, and input from respondents and experts. We investigated internal consistency of the short version and concordance with th..View full abstract