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Exhibits 62 to 64

Exhibit 62. Results of logistic regression using the derivation dataset for only total hip surgery

VariableEstimatetValueProbability
Intercept-3.76-1.010.3183
Age-0.02-1.110.2674
Chronic lung disease1.852.330.0197
Charlson score*-0.47-1.070.2827
Emergency surgery1.752.380.0172
General anesthesia1.221.460.1447
Male1.111.850.0645
Postop admission3.553.360.0008
Preop glucose*-0.01-0.460.6616
Preop hematocrit-0.03-0.280.7829
Preop hemoglobin-0.25-0.680.4966
Surgery duration0.011.910.0571
Wound class0.541.380.1681

*Additional Intermountain risk factor.

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Exhibit 63. Results of logistic regression using the validation dataset for only total hip surgery

VariableEstimatetValueProbability
Intercept-3.87-1.340.1815
Age-0.01-0.620.5327
Chronic lung disease0.440.670.4999
Charlson score*0.080.330.7412
Emergency surgery0.951.180.2372
General anesthesia1.121.440.1489
Male-0.78-1.330.1842
Postop admission1.372.630.0086
Preop glucose*-0.01-1.220.2331
Preop hematocrit-0.06-0.660.5089
Preop hemoglobin0.130.460.6480
Surgery duration0.011.750.0801
Wound class0.260.490.6263

*Additional Intermountain risk factor.

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Exhibit 64. Results of logistic regression using the combined dataset for only total hip surgery

VariableEstimatetValueProbability
Intercept-3.87-1.680.1005
Age-0.02-1.230.2195
Chronic lung disease1.072.320.0205
Charlson score*-0.14-0.630.5271
Emergency surgery1.312.600.0094
General anesthesia1.031.870.0618
Male0.110.280.7768
Postop admission2.044.700.0000
Preop glucose*-0.01-0.960.3454
Preop hematocrit-0.05-0.780.4367
Preop hemoglobin-0.01-0.030.9787
Surgery duration0.012.940.0033
Wound class0.341.130.2605

*Additional Intermountain risk factor.

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Current as of December 2012
Internet Citation: Exhibits 62 to 64. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh62-64.html