Table 4.
Contributions of combined state-level factors to the interstate variation in nephrologist care at least 12 months before ESRD, controlling for patient-level factors, separately for each of the four race–age subpopulations
| Category of the State-Level Factors | Percentage of Interstate Variation Explained by One or More of the Categories of State-Level Factorsa | |||
|---|---|---|---|---|
| Age <65 yr | Age ≥65 yr | |||
| Black | White | Black | White | |
| General healthcare access | 38.1 | 31.7 | 32.0 | 18.1 |
| Preventive care | 29.7 | 30.6 | 29.7 | 29.2 |
| Socioeconomic status | 31.4 | 27.8 | 33.9 | 25.3 |
| Healthcare resources | 20.6 | 19.2 | 17.0 | 18.1 |
| Geographic properties | 7.8 | 6.6 | 4.8 | 5.6 |
| General healthcare access, preventive care, and socioeconomic status combinedb | 65.9 | 58.2 | 61.8 | 55.3 |
| All five categories combinedb | 70.3 | 63.0 | 65.8 | 61.4 |
a
Results for each subpopulation were obtained separately and were calculated by the percent reduction in the interstate variation between the model with (model 4) and the model without (model 2) the state factors including one or more categories indicated in the first column, controlling for the patient factors.
b
Less than the numerical sum of the categories because of overlaps in the contributions of different categories.