Table 4. Multivariable Regression Model of Cumulative Repository Corticotropin–Related Payments (Scaled to $10 000) and Log-Transformed Medicare Spending on Corticotropin.
| Variable | Coefficient (95% CI) | P Value |
|---|---|---|
| Payment amounta | 1.0787 (1.0435-1.1152) | <.001 |
| Specialty | ||
| Nephrology | 1 [Reference] | <.001 |
| Neurology | 0.9600 (0.7721-1.1936) | |
| Rheumatology | 1.4378 (1.2223-1.6913) | |
| Female | 0.8554 (0.7422-0.9858) | .03 |
| Practice size | ||
| 1 | 1 [Reference] | .31 |
| 2-10 | 1.1082 (0.9225-1.3314) | |
| 11-50 | 0.9220 (0.7438-1.1429) | |
| >50 | 1.0645 (0.8871-1.2773) | |
| Time since graduation, y | ||
| ≤10 | 1 [Reference] | .49 |
| 11-30 | 1.1773 (0.8781-1.5786) | |
| >30 | 1.1906 (0.8744-1.6212) | |
| Not reported | 1.4069 (0.9091-2.1772) | |
| Region | ||
| Northeast | 1 [Reference] | .35 |
| Midwest | 0.9585 (0.7814-1.1756) | |
| South | 0.9045 (0.762-1.0736) | |
| Pacific West | 1.0532 (0.8356-1.3275) | |
| Mountain West | 0.8003 (0.596-1.0748) | |
| Total noncorticotropin payments from industrya | 0.9972 (0.9999-1.0003) | .16 |
| No. of noncorticotropin prescriptions per beneficiary | 1.0060 (0.9901-1.0221) | .46 |
| Cost of noncorticotropin prescriptions per claim | 1.0001 (0.9934-1.0011) | .40 |
a
Scaled to $10 000.