Page 1 of 1

Exhibits 56 to 58

Exhibit 56. Results of logistic regression using the derivation dataset for only CABG surgeries

VariableEstimatetValueProbability
Intercept-10.72-2.920.0035
Elective surgery-1.88-2.430.0150
BMI0.123.210.0013
History of cancer3.302.560.0104
Charlson score*-0.63-1.880.0597
Emergency surgery-1.31-1.450.1479
History of MRSA3.023.570.0004
No. of procedures-1.31-1.990.0466
No. of surgeons*1.072.140.0326
Postop admission1.572.440.0149
Postop glucose*0.010.960.3370
Postop hemoglobin-0.33-1.990.0471
Preop albumin0.981.720.0863
Preop glucose0.012.020.0437
Preop stay-0.45-1.360.1745

* Additional Intermountain risk factor.

Return to Document

Exhibit 57. Results of logistic regression using the validation dataset for only CABG surgeries.

VariableEstimatetValueProbability
Intercept-3.96-1.180.2365
Elective surgery-0.21-0.350.7255
BMI0.092.550.0109
History of cancer@   
Charlson score*-0.33-1.260.2071
Emergency surgery1.081.830.0672
History of MRSA0.910.940.3456
No. of procedures-0.22-0.460.6476
No. of surgeons*0.500.650.5161
Postop admission1.582.750.0059
Postop glucose*0.00-0.440.6635
Postop hemoglobin-0.19-1.350.1782
Preop albumin-0.28-0.490.6246
Preop glucose*-0.01-0.840.3995
Preop stay0.121.680.0923

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

Return to Document

Exhibit 58. Results of logistic regression using the combined dataset for only CABG surgeries

VariableEstimatetValueProbability
Intercept-7.42-3.280.0011
Elective surgery-0.53-1.180.2365
BMI0.104.190.0000
History of cancer1.601.710.0875
Charlson score*-0.45-2.480.0132
Emergency surgery0.140.310.7555
History of MRSA1.903.370.0008
No. of procedures-0.65-1.680.0920
No. of surgeons*0.681.730.0831
Postop admission1.503.710.0002
Postop glucose*0.000.530.5975
Postop hemoglobin-0.24-2.350.0186
Preop albumin0.280.720.4716
Preop glucose*0.000.440.6570
Preop stay0.101.370.1712

* Additional Intermountain risk factor.

Return to Document

Page last reviewed December 2012
Internet Citation: Exhibits 56 to 58. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh56-58.html