Table 2 Regression results for probability of surgery and cost per episode
Selected independent variables | Probability of surgery (Odds ratios) | Cost per episode (Regression coefficients) | ||
Cataract | ||||
Medicare physician payment ratio | -- | 1.205 | -- | 57.96 |
PCPs per 1000 pop. | 0.730 | 0.665 | −118.04 | −147.99 |
Ophthalmologists per 1000 pop. | 103.008 | 416.794 | 1927.73 | 2263.34 |
ASC capacity per 1000 pop. | 18.115 | 12.998 | 731.66 | 559.47 |
Medicare HMO % | 0.998 | 1.001 (.3) | −1.27(.02) | −0.87 (.10) |
% Uninsured | 1.030 | 1.036 | 9.77 | 11.74 |
Family income | 0.998 | 0.998 | −0.61 | −0.59 |
County diagnosis propensity | 0.574 | 0.343 | −276.64 | −521.37 |
Has Medicaid coverage | 1.211 | 1.196 | 109.13 | 104.10 |
Episodes in 2005 & 2006 | −0.262 | −0.264 | −151.81 | −152.4 |
Episodes in 2004 & 2006 | −0.375 | −0.373 | −215.27 | −214.4 |
Episodes in 2004-2006 | −0.461 | −0.458 | −237.47 | −236.28 |
Knee degeneration | ||||
Medicare physician payment ratio | -- | 1.048 | -- | 115.57 |
PCPs per 1000 pop. | 0.814 | 0.821 | −204.87 (.22) | −179.78 (.27) |
Orthopedists per 1000 pop. | 69.875 | 57.435 | 8608.65 | 8076.99 |
Hospital beds per 1000 pop. | 0.981 | 0.979 | −14.78 (.34) | −18.75 (.22) |
Medicare HMO % | 1.000 (.87) | 1.001 (.31) | .67 (.92) | 4.03 (.54) |
% Uninsured | 1.000 (.86) | 1.003 (.29) | −14.50 (.29) | −8.32 (.54) |
Family income | 0.999 | 0.999 | −2.67 (.02) | −2.636 (.02) |
County diagnosis propensity | 44.411 | 33.347 | 5783.25 | 5122.99 |
Has Medicaid coverage | 0.554 | 0.553 | −1050.76 | −1058.45 |
Episodes in 2005 & 2006 | 0.608 | 0.608 | 1465.48 | 1465.09 |
Episodes in 2004 & 2006 | 0.282 | 0.282 | 492.64 | 492.75 |
Episodes in 2004-2006 | 0.315 | 0.315 | 681.79 | 681.77 |
Benign neoplasm of the prostate | ||||
Medicare physician payment ratio | -- | 1.022 | -- | 8.57 |
PCPs per 1000 pop. | 0.565 | 0.545 | −174.1 | −191.45 |
Urologists per 1000 pop. | 372.571 | 595.574 | 2507.85 | 2720.77 |
Hospital beds per 1000 pop. | 0.966 | 0.965 | −15.59 | −15.53 |
ASC capacity per 1000 pop. | 6.910 | 8.129 | 573.2 | 647.11 |
Medicare HMO % | 0.994 | 0.994 | −1.48 (.25) | −1.25 (.33) |
% Uninsured | 1.035 | 1.034 | 14.04 | 14.25 |
Family income | 0.998 | 0.998 | −0.52 | −0.52 |
County diagnosis propensity | 0.080 | 0.059 | −775.55 | −920.16 |
Has medicaid coverage | 1.432 | 1.436 | 231.25 | 232.14 |
Episodes in 2005 & 2006 | −0.192 | −0.193 | −121.28 | −121.53 |
Episodes in 2004 & 2006 | −0.158 | −0.158 | −113.88 | −113.52 |
Episodes in 2004-2006 | −0.618 | −0.617 | −231 | −230.46 |