title: Factor structure and invariance of the Quality of Life in Alzheimer's Disease (QoL-AD) Scale.
abstract: The factor structure and factorial invariance of the Quality of Life in Alzheimer's Disease (QoL-AD) Scale was investigated in a sample of 653 nondemented, community-dwelling older adults, ages 57 to 95 years (M = 71.62, SD = 8.86), from the Seattle Longitudinal Study. The total sample was split into two random halves to explore and confirm the structure of the QoL-AD. Confirmatory factor analyses indicated better fit for a three-factor solution than one- or two-factor solutions. Weak factorial invariance was found for the three-factor solution (Physical, Social, and Psychological Well-being) across age group and gender. These findings may help to establish a baseline quality of life before the onset of any noticeable AD symptoms.
authors.affiliation: Department of Psychology, University of Massachusetts-Dartmouth, North Dartmouth, Massachusetts 02747-2300, USA. arevell@umassd.edu
authors.forename: Andrew J
authors.initials: AJ
authors.lastname: Revell
authors.forename: Grace I L
authors.initials: GI
authors.lastname: Caskie
authors.forename: Sherry L
authors.initials: SL
authors.lastname: Willis
authors.forename: K Warner
authors.initials: KW
authors.lastname: Schaie
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000175:diagnosis; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D011788:Quality of Life; D011795:Surveys and Questionnaires