Cognitive Domains and Functional Assessment Questionnaire (CDFAQ): accuracy and correlation with IQCODE

Background The Cognitive Domains and Functional Assessment Questionnaire (CDFAQ) assesses cognitive domains and functional decline based on the DSM‐5 criteria for Neurocognitive Disorders. It has two versions, one for the patient (CDFAQ‐PV) and another for the informant (CDFAQ‐IV) assessing: Complex Attention (CA), Executive Functions (EF), Learning and Memory (LM), Language (L), Perceptual‐Motor Domain (PM) and Social Cognition. Recently, the CDFAQ was translated and adapted to English. Method To describe the performance of the CDFAQ‐PV and CDFAQ‐IV assessing Brazilian older adults compared with the Informant Questionnaire on Cognitive Decline in the Elderly Long Version – IQCODE‐LV. This study was approved by the ethical committee of the UFMG and the CDFAQ was applied to 132 subjects in the University Hospital. The CDFAQ‐PV was applied to 66 older adults and the CDFAQ‐IV, as well as the IQCODE‐LV, to their 66 respective informants. Non‐parametric correlation with IQCODE‐LV and accuracy assessment by Receiver Operating Characteristic (ROC) with cutoff for dementia were performed. Result The median age of the patients was 70.5 years (IQR = 13.5) and 5 years of schooling (IQR = 7), while the informants had a median age of 55 years (IQR = 24.5) and 12 years of schooling (IQR = 8). The CDFAQ‐IV showed a strong positive correlation (Rho:0.708, p