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Exp Aging Res. 2009 Apr-Jun;35(2):250-67. doi: 10.1080/03610730902720521.

Factor structure and invariance of the Quality of Life in Alzheimer's Disease (QoL-AD) Scale.

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  • 1Department of Psychology, University of Massachusetts-Dartmouth, North Dartmouth, Massachusetts 02747-2300, USA.


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.

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