Table 3.
Proportion of Variation in LTAC Transfer Explained by Patients, Hospitals, and Regions a
| VPC (95% CI) | Case-mix only | Case-mix + hospital | Case-mix + hospital + region (full model) |
|---|---|---|---|
| Between patients | 56.9% (51.7%−62.1%) | 57.8% (52.4%−62.8%) | 74.5% (70.0%−79.0%) |
| Between hospitals | 15.4% (11.7%−19.0%) | 15.4% (11.7%−19.1%) | 18.4% (14.1%−22.7%) |
| Between regions | 27.8% (22.1%−33.5%) | 27.0% (21.3%−32.7%) | 7.1% (3.9%−10.2%) |
Abbreviations: LTAC, long-term acute care hospital; VPC, variance partition coefficient; CI, confidence interval
a
Variance partition coefficients (VPC) describe the proportion of variation explained by unobserved differences between patients, hospitals, and hospital referral regions. We conducted sequential multilevel mixed-effects logistic regression models to estimate the impact of adjusting for each successive level of predictors shown in Table 2.