A multivariate analysis of disability and health, and its change over time in the National Channeling Demonstration data.

The Channeling Demonstration examined the effects of case management interventions on a variety of outcomes. In the study, longitudinal data were collected from interviews of cases and controls. A multivariate procedure applied to this data identified groups with specific health profiles. Six profiles described health variation over individuals, and time, according to likelihood ratio statistics. Six sets of life tables were calculated, one for each health profile, to estimate the average duration of service use and the "follow-up" services used. A number of differences, and changes, in service use between the six groups were significant.