Table 4.
Change in Utilization in the Oregon and Colorado Medicaid, Child and Adult Populations
| Expenditure and Utilization Measures | Changes in Oregon Medicaid compared to Changes in Colorado Medicaid † (95% CI) | |||||
|---|---|---|---|---|---|---|
| Children (N = 283,816 OR; N = 247,215 CO) | Adults (N = 155,507 OR; N = 77,720 CO) | |||||
| Average 2-year effect | Year 1 (2013) effect | Year 2 (2014) effect | Average 2-year effect | Year 1 (2013) effect | Year 2 (2014) effect | |
| Standardized Expenditures (total, US $) | −0.22 (−2.25, 1.82) | 0.22 (−1.88, 2.31) | −0.65 (−3.17, 1.87) | −4.27 (−12.65, 4.11) | −11.18* (−20.90, −1.46) | 2.57 (−9.70, 14,84) |
| Spending by BETOS code (US $) | ||||||
| Evaluation & Management | −0.90* (−1.57, −0.24) | −0.39 (−1.02, 0.24) | −1.42* (−2.18, −0.66) | −0.53 (−2.04, 0.99) | 0.61 (−0.98, 2.19) | −1.67 (−3.42, 0.09) |
| Imaging | 0.12* (0.05, 0.19) | 0.07 (−0.01, 0.15) | 0.17* (0.08, 0.26) | 1.19* (0.58, 1.80) | 0.68* (0.09, 1.26) | 1.70* (0.95, 2.46) |
| Procedures | 0.30* (0.04, 0.56) | 0.11 (−0.16, 0.39) | 0.48* (0.18, 0.79) | −0.20 (−1.33, 0.93) | 0.26 (−0.78, 1.31) | −0.66 (−2.30, 0.98) |
| Tests | −0.04 (−0.12, 0.05) | −0.09* (−0.18, −0.00) | 0.01 (−0.09, 0.12) | −0.43 (−1.19, 0.32) | −0.65 (−1.37, 0.08) | −0.22 (1.12, 0.68) |
| Inpatient Facility | 0.31 (−1.39, 2.00) | 0.49 (−1.21, 2.20) | 0.12 (−2.07, 2.32) | −4.28 (−12.13, 3.58) | −12.10* (−20.53, −3.58) | 3.51 (−8.28, 15.29) |
| Spending by site (US $) | ||||||
| Outpatient services | −0.56 (−1.29, 0.18) | −0.27 (−1.03, 0.49) | −0.84 (−1.70, 0.01) | 0.78 (−1.61, 3.18) | 1.97 (−0.32, 4.26) | −0.40 (−3.29, 2.48) |
| Inpatient services | 0.34 (−1.48, 2.16) | 0.47 (−1.37, 2.31) | 0.21 (−2.16, 2.58) | −5.05 (−13.49, 3.39) | −13.20* (−22.48, −3.92) | 3.05 (−9.38, 15.48) |
| Utilization (Per 1000 beneficiary months) | ||||||
| ED visits | −1.94 (−5.48, 1.61) | −0.88 (−4.18, 2.41) | −2.99 (−6.88, 0.90) | −11.63* (−17.85, −5.42) | −8.86* (−15.70, −2.02) | −14.45* (−20.60, −8.30) |
| Primary care visits | −11.54* (−21.48, −1.60) | −10.80 (−21.80, 0.20) | −12.29* (−21.86, −2.72) | −16.79* (−33.57,0.00) | −1.13 (−18.88,16.63) | −32.37* (−49.16, −15.38) |
| Inpatient days | 0.20 (−0.88, 1.27) | 0.31 (−0.77, 1.40) | 0.08 (−1.32, 1.47) | −2.72 (−7.71, 2.28) | −7.69* (−13.11, −2.27) | 2.23 (−5.26,9.72) |
†
Adjusted difference based on propensity score weighted difference-in-differences regression model;
*
Statistically significant at P<0.05