Doctor of Philosophy, Case Western Reserve University, 2005, Epidemiology and Biostatistics
Quality research in home health care is complex since no gold standard exists for measuring adverse outcomes and the patient and clinician populations are heterogeneous. Furthermore, mortality, the outcome often used for quality research in institutionalized settings is not appropriate for home health care as unexpected death is too rare. This study evaluated three indices of functional decline. The first index is defined by the Centers for Medicare and Medicaid Services' (CMS) as ‘substantial decline in three or more activities of daily living' (ADLs). Substantial is considered a minimum two-unit decline and the ADLs evaluated were grooming, toileting, bathing, ambulation, and transferring. Alternative indices were developed with frequencies of 783 (1.58%) for ‘substantial declines in two or more ADLs' (Index Two) and 4 271 (8.64%) for ‘substantial declines in one or more ADLs' (Index One). This dissertation evaluated the predictive validity of all three indices. The CMS index (Index Three) was so rare it rendered statistical analyses meaningless (n=212). Index Two had the best predictive validity with c-statistics above 0.70, non-significant Hosmer-Lemeshow X2 indicating reasonable model fit, and moderate covariate consistency. These results were validated with follow-up data. Index One had reasonable model fit and moderate covariate consistency, however it consistently had lower c-statistics as compared to Index Two. Index Two was used in a two-stage approach using an ordinary least squares (OLS) unbiased model incorporating team fixed effects. These risk-adjusted team fixed effects scores were regressed against eighteen objective organizational factors. Core nurses (a measure of nursing concentration) had an inverse relationship (estimate= -0.48, t= -2.29); average number of years worked at the agency per team was also inversely associated (estimate=-0.75, t= -2.36); the number of different licensed home health aide agencies employed had a positive association ( (open full item for complete abstract)
Committee: Natalie Colabianchi (Advisor)
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