Dementia quality of life instrument - construct and concurrent validity in patients with mild to moderate dementia

Background and purpose: To translate the Dementia quality of life instrument (DQoL) into German and assess its construct and concurrent validity in community‐dwelling people with mild to moderate dementia. Methods: Dementia quality of life instrument data of two pooled samples (n = 287) were analysed regarding ceiling and floor effects, internal consistency, factor reliability and correlations with corresponding scales on quality of life (Quality of Life in Alzheimer‘s Disease and SF‐12), cognition (Mini‐Mental State Examination, Alzheimer’s Disease Assessment Scale – cognitive), depression (Cornell Scale for Depression in Dementia) and activities of daily living (Interview of Deterioration in Daily Living Activities in Dementia). Results: We found no floor effects (