Page 1 of 1

Exhibits 68 to 70

Exhibit 68. Results of logistic regression using the derivation dataset for only appendectomy surgeries

VariableEstimatetValueProbability
Intercept-2.31-0.880.3806
Age0.011.120.2634
Charlson score*0.201.960.0496
Diabetes-1.07-1.120.2646
General anesthesia-1.25-0.820.4100
History of MRSA1.511.320.1860
Postop admission2.214.560.0000
Postop hematocrit-0.14-2.000.0478
Postop hemoglobin0.271.020.3178
Preop glucose*0.010.990.3222
Preop hemoglobin-0.16-0.680.5045

*Additional Intermountain risk factor.

Return to Document

Exhibit 69. Results of logistic regression using the validation dataset for only appendectomy surgeries.

VariableEstimatetValueProbability
Intercept-4.95-1.270.2050
Age-0.01-0.210.8311
Charleson score*-0.32-0.780.4367
Diabetes1.901.240.2134
General anesthesia@   
History of MRSA@   
Postop admission2.402.920.0035
Postop hematocrit-0.28-2.090.0392
Postop hemoglobin0.842.060.0434
Preop glucose*-0.01-0.920.3632
Preop hemoglobin-0.09-0.310.7564

@No patients in this dataset had the specific risk factor and no probability could be calculated.
*Additional Intermountain risk factor.

Return to Document

Exhibit 70. Results of logistic regression using the combined dataset for only appendectomy surgeries

VariableEstimatetValueProbability
Intercept-3.34-1.480.1399
Age0.011.010.3142
Charlson score*0.161.650.0995
Diabetes-0.62-0.790.4299
General anesthesia-1.72-1.330.1823
History of MRSA0.970.890.3710
Postop admission2.275.430.0000
Postop hematocrit-0.13-2.240.0263
Postop hemoglobin0.402.150.0317
Preop glucose*0.000.650.5150
Preop hemoglobin-0.16-0.970.3379

*Additional Intermountain risk factor.

Return to Document

Current as of December 2012
Internet Citation: Exhibits 68 to 70. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh68-70.html