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Departments of 1 Psychiatry
2 Medicine
3 Pharmacology, South Texas Veterans' Health System, Audie L. Murphy Division Geriatric Research, Education and Clinical Center (GRECC), and the University of Texas Health Science Center, San Antonio.
Address correspondence to Marsha J. Polk, MMEd, Department of Psychiatry, MC 7792, UTHSCC, 7703 Floyd Curl Drive, San Antonio, TX 78229-3900. E-mail: polk{at}uthscsa.edu
Background. The ability to predict the level of care received by elderly retirees was compared in a discriminant model and using a classification tree derived from cognitive and noncognitive variables.
Methods. Participants were 193 residents (mean age, 79.1 ± 5.1 years) of a single, 1500-bed, continuing care retirement community. They were given a battery of cognitive measures that included tests of general cognition, memory, and executive control function. A multivariate discriminant model of level of care was compared with a classification tree.
Results. Residents in congregate high-rises (n = 115) differed significantly from those in apartment settings (n = 78) with respect to age, Executive Interview (EXIT25), and the Executive Clock-Drawing Task (CLOX). Only age and executive control function measures (CLOX1, EXIT25, and Trail Making Test Part B [Trails B]) contributed independently to a discriminant model of level of care (Wilke's 
= 0.92; F [df 4,170] = 3.48; p <.01). Sixty-three percent of participants were correctly classified. A classification tree derived from the same variable set was more accurate (75% correctly classified). Age, CLOX1, and EXIT25 made the most important contributions to the model. The EXIT25 and CLOX1 thresholds empirically derived from this model coincide with the fifth percentiles for these instruments in a young adult sample.
Conclusions. Executive control function appears to be most responsible for the effect of cognition on level of care. Young adult norms may be most relevant when the effects of cognitive impairment on functional status are assessed.
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