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Some Statistical Issues in the Analyses of Data From Longitudinal Studies of Elderly Chronic Care Populations

From the New York State Psychiatric Institute and Columbia University, Department of Biostatistics (E.P.), New York, New York.; Columbia University, Stroud Center, New York State Psychiatric Institute and Hebrew Home for the Aged at Riverdale (J.T.), Riverdale, New York.

View larger version (15K): [in a new window]   Fig. 1. Schematic presentation of the covariances. 0 and 1 are 3 x 3 covariance matrices.

View larger version (8K): [in a new window]   Fig. 2. Total, direct, and indirect (through cognition) effects of SCU residence on functioning. For clarity of presentation, the paths involving baseline function and cognition are not shown.

View larger version (13K): [in a new window]   Fig. 3. Increase of functional limitations over time (Equation 6). For this figure, we have set the baseline cognition to a moderately impaired level (50) and the baseline age to about the average age for the entire sample (80 years).

View larger version (17K): [in a new window]   Fig. 4. Direct effect of residence on functional limitations over time (Equation 7). The indirect effect of residence on functioning, occurring through cognition, has been controlled.