Factor structure and invariance of the Quality of Life in Alzheimer's Disease (QoL-AD) Scale.
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.
Revell
Andrew J
AJ
Department of Psychology, University of Massachusetts-Dartmouth, North Dartmouth, Massachusetts 02747-2300, USA. arevell@umassd.edu
Caskie
Grace I L
GI
Willis
Sherry L
SL
Schaie
K Warner
KW
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