Table 3.
Results of Multinomial Logistic Regression Model Comparing Odds of Membership in Medication Supply Categories, for Dual Prescription Users (n = 5,194) and Part D‐only Users (n = 9,922), Relative to VA‐only Users (n = 35,647)
| Unadjusted odds ratios and 95% confidence intervals | Adjusted odds ratios and 95% confidence intervals (IPT‐weighted Model)a | Adjusted predicted probabilities and 95% confidence intervals | |||||
|---|---|---|---|---|---|---|---|
| Dual prescription users | Part D‐only users | Dual prescription users | Part D‐only users | VA‐only users | Dual prescription users | Part D‐only users | |
| Appropriate supply of all classes | ref | ref | ref | ref | 46.0% (45.3–46.6) | 36.3% (34.0–38.7) | 47.3% (45.1–49.5) |
| Undersupply for at least one class, but no oversupply | 1.40 (1.31, 1.50) | 1.22 (1.16, 1.27) | 1.28 (1.13, 1.44) | 1.13 (1.03, 1.25) | 40.1% (39.5–40.8) | 40.5% (38.1–42.9) | 46.8% (44.6–48.9) |
| Oversupply for at least one class, but no undersupply | 3.05 (2.79, 3.32) | 0.59 (0.53, 0.66) | 2.00 (1.75, 2.29) | 0.39 (0.32, 0.47) | 9.9% (9.5–10.3) | 15.7% (14.2–17.1) | 4.0% (3.3–4.6) |
| Oversupply and undersupply for at least one class | 4.09 (3.66, 4.58) | 0.84 (0.73, 0.96) | 2.40 (2.00, 2.88) | 0.48 (0.40, 0.57) | 4.0% (3.7–4.3) | 7.5% (6.5–8.6) | 1.9% (1.6–2.2) |
a
The following variables were included in the IPT weights: age, sex, race/ethnicity, VA priority group, Medicaid/LIS enrollment, distance from VA, region, rural/urban, number and specific type of Elixhauser comorbidities, memantine use as proxy for dementia severity, use of home‐based primary care, baseline inpatient visits, baseline emergency room visits, days alive in 2010, total number of unique medications, and VISN indicators.