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BACKGROUND: There are a few validated tools capable of assessing the dimensions essential for the diagnosis of dementia and cognitive disorders in sub-Saharan Africa. OBJECTIVES: Our aim was to develop an adapted tool, the Central African - Daily Functioning Interference (DFI) scale. METHODS: An initial 16-item scale of activity limitations and participation restrictions was completed by 301 participants with low cognitive performances to assess their level of DFI. A psychometric evaluation was performed using Item Response Theory. RESULTS: A unidimensional 10-item scale emerged with a reasonable coverage of DFI (thresholds range: -1.067 to 1.587) with good item discrimination properties (1.397-4.076) and a high reliability (Cronbach's al pha = 0.92). The cutoff for detecting 96% of those with dementia was with a latent score ≥0.035 that corresponds to the LAUNDRY limitation. CONCLUSIONS: These results provide valuable support for the reliability and internal validity of an operational 10-item scale for DFI assessment used in Central Africa for the diagnosis of dementia in the elderly.

Original publication




Journal article


Dement Geriatr Cogn Disord

Publication Date





29 - 41


Activity limitations, Central Africa, Daily functioning interference, Dementia diagnosis, Item response theory, Participation restrictions, Psychometric evaluation, Activities of Daily Living, Africa, Central, Aged, Aged, 80 and over, Cognition, Dementia, Female, Humans, Male, Patient Participation, Psychometrics, Refusal to Participate, Reproducibility of Results