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Exhibits 38 to 40

Exhibit 38. Results of logistic regression using the derivation dataset for only total hip surgery

VariableEstimatetValueProbability
Intercept-3.15016-1.311030.19127
Age-0.02436-1.366770.17172
Chronic lung disease0.7172341.2998570.19365
Emergency surgery1.6677832.7119890.00669
No. of procedures0.6471882.8577930.00442
Postop admission1.5028922.8958680.00379
Postop hemoglobin-0.26253-1.521520.12890
Preop hemoglobin0.0134040.2310.82005
Surgery duration0.0073712.7142240.00665

Postop = postoperative; Preop = preoperative.

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Exhibit 39. Results of logistic regression using the validation dataset for only total hip surgery

VariableEstimatetValueProbability
Intercept-5.30978-2.31020.02089
Age-0.01718-1.016010.30962
Chronic lung disease1.1816842.5247450.01158
Emergency surgery2.015013.4200560.00063
No. of procedures-0.58576-0.611540.54084
Postop admission1.9625643.9888430.00007
Postop hemoglobin0.0793680.5600870.72071
Preop hemoglobin0.0190210.3611410.44228
Surgery duration0.0024671.8907690.05866

Postop = postoperative; Preop = preoperative.

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Exhibit 40. Results of logistic regression using the combined dataset for only total hip surgery

VariableEstimatetValueProbability
Intercept-4.28495-2.911290.00361
Age-0.02085-1.749050.08028
Chronic lung disease0.9301472.6457460.00815
Emergency surgery1.7308284.1820020.00003
No. of procedures0.4102271.9311151.931115
Postop admission1.7285144.9711040.00000
Postop hemoglobin-0.09155-0.897980.36925
Preop hemoglobin0.0146340.4646050.64256
Surgery duration0.0031862.9976690.00272

Postop = postoperative; Preop = preoperative.

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Page last reviewed December 2012
Internet Citation: Exhibits 38 to 40. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh38-40.html