Exhibit 65. Results of logistic regression using the derivation dataset for only total knee surgery
Variable | Estimate | tValue | Probability |
---|---|---|---|
Intercept | -6.27 | -3.13 | 0.0025 |
Charlson score* | 0.32 | 2.03 | 0.0423 |
General anesthesia | -0.48 | -1.22 | 0.2231 |
Male | 0.90 | 2.20 | 0.0280 |
History of MRSA | 1.49 | 2.69 | 0.0071 |
Postop admission | 2.97 | 4.83 | 0.0000 |
Postop hematocrit | 0.06 | 0.86 | 0.3922 |
Preop hematocrit | 0.09 | 0.57 | 0.5742 |
Preop hemoglob | -0.50 | -1.09 | 0.2835 |
Surgery duration | 0.00 | 1.25 | 0.2104 |
*Additional Intermountain risk factor.
Exhibit 66. Results of logistic regression using the validation dataset for only total knee surgery
Variable | Estimate | tValue | Probability |
---|---|---|---|
Intercept | -3.76 | -2.23 | 0.0256 |
Charlson score* | -0.51 | -1.75 | 0.0793 |
General anesthesia | 0.53 | 1.33 | 0.1819 |
Male | 0.60 | 1.70 | 0.0896 |
History of MRSA | 2.12 | 4.45 | 0.0000 |
Postop admission | 1.74 | 4.66 | 0.0000 |
Postop hematocrit | -0.01 | -0.10 | 0.9173 |
Preop hematocrit | 0.06 | 0.54 | 0.5918 |
Preop hemoglob | -0.37 | -1.11 | 0.2670 |
Surgery duration | 0.01 | 1.64 | 0.1007 |
*Additional Intermountain risk factor.
Exhibit 67. Results of logistic regression using the combined dataset for only total knee surgery
Variable | Estimate | tValue | Probability |
---|---|---|---|
Intercept | -4.57 | -3.79 | 0.0002 |
Charlson score* | 0.03 | 0.19 | 0.8475 |
General anesthesia | 0.11 | 0.43 | 0.6692 |
Male | 0.73 | 2.75 | 0.0059 |
History of MRSA | 1.76 | 5.01 | 0.0000 |
Postop admission | 2.15 | 6.99 | 0.0000 |
Postop hematocrit | 0.02 | 0.46 | 0.6493 |
Preop hematocrit | 0.04 | 0.37 | 0.7176 |
Preop hemoglob | -0.33 | -1.08 | 0.2875 |
Surgery duration | 0.00 | 1.78 | 0.0759 |
*Additional Intermountain risk factor.