Table 2.
Regression Estimates of Survival on DRG Inputs and the Effective Treatments Diffusion Factor
| Dependent Variable | One-Year Survival | One-Year Survival |
|---|---|---|
| Diffusion Factor (continuous) |
0.014 (0.001) |
|
| Diffusion Quintile 2 | 0.009 (0.002) |
|
| Diffusion Quintile 3 | 0.016 (0.002) |
|
| Diffusion Quintile 4 | 0.024 (0.003) |
|
| Diffusion Quintile 5 | 0.027 (0.002) |
|
| Log (DRG) |
0.022 (0.004) |
0.023 (0.004) |
| R2 | 0.09 | 0.09 |
Notes: Each column reports estimates from a separate regression in which an observation is a hospital-year, with N = 49,937 hospital-years. All regressions are weighted by the number of patients in each hospital-year. The dependent variable is the risk-adjusted one-year survival rate among AMI patients. The diffusion factor and quintiles are based on the common factor estimated from a 1-factor model of hospital use of aspirin, β blockers, and reperfusion. Log(DRG) is the log of the risk-adjusted total DRG weights per patient in the year following their AMI. Year dummy variables are included in all regressions. Risk-adjusted survival and DRG weights are derived from Medicare claims data from 1986–2004. The sample is limited to hospital/year observations with at least 5 observations per hospital. Standard errors (clustered at the hospital level) are in parentheses.