Exhibit A6. Regression Analyses of Medicare Episode Payments and Beneficiary Episode Liabilities: Incremental Cost of Hospital-Acquired Deep Vein Thrombosis and Pulmonary Embolism following Certain Orthopedic Procedures.
| Regression Variables | Coefficients for regression on Ln (Part A and Part B Medicare episode payments)1 | Standard errors for regression on Ln (Part A and Part B Medicare episode payments) |
|---|---|---|
| Deep-vein thrombosis and pulmonary embolism following certain orthopedic procedures2 | 0.122*** | (0.010) |
| Acute urinary tract infection | 0.08*** | (0.021) |
| Age greater than 75^ | 0.148*** | (0.009) |
| Acute myocardial infarction and/or congestive heart failure | 0.166*** | (0.020) |
| History of deep vein thrombosis | −0.090 | (0.120) |
| Fracture of a lower extremity | 0.521*** | (0.014) |
| Malignancy | 0.040 | (0.031) |
| Overweight or obese | 0.019 | (0.015) |
| Sepsis | 0.403*** | (0.124) |
| Provider fixed effects | Yes | n/a |
| Robust Standard Errors | No | n/a |
| Constant | 10.133*** | (0.005) |
| Observations | 26,757 | — |
| R-squared | 0.465 | — |
NOTES:
*
statistically significant difference with p<0.10,
**
p<0.05,
***
p<0.01
^
Indicates variables that were also used in the matching algorithm
1
The dependent variable is the natural log of Medicare payments measured in dollars.
2
Deep-vein thrombosis and pulmonary embolism following certain orthopedic procedures is the hospital acquired condition of interest.
SOURCE: RTI analysis of FY 2009 and FY 2010 Medicare episodes of care data.