Improving the Measurement of Surgical Site Infection Risk Stratification/Outcome Detection

Exhibits 59 to 61

Exhibit 59. Results of logistic regression using the derivation dataset for only herniorrhaphy

Variable Estimate tValue Probability
Intercept -3.04 -1.16 0.2480
Emergency surgery 0.76 1.01 0.3111
Previous DVT 1.26 1.87 0.0609
Male 0.34 0.60 0.5500
Postop admission 3.17 3.98 0.0001
Preop albumin -0.75 -1.30 0.1965
Preop glucose* 0.00 -0.44 0.6643

*Additional Intermountain risk factor.

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Exhibit 60. Results of logistic regression using the validation dataset for only herniorrhaphy

Variable Estimate tValue Probability
Intercept -3.94 -0.92 0.3794
Emergency surgery 1.21 1.83 0.0676
Previous DVT@      
Male -0.87 -1.37 0.1703
Postop admission 2.91 3.67 0.0002
Preop albumin -0.44 -0.42 0.6821
Preop glucose* 0.00 0.29 0.7724

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

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Exhibit 61. Results of logistic regression using the combined dataset for only herniorrhaphy

Variable Estimate tValue Probability
Intercept -4.00 -1.96 0.0561
Emergency surgery 1.10 2.37 0.0178
Previous DVT 0.52 0.88 0.3775
Male -0.23 -0.55 0.5789
Postop admission 3.08 5.53 0.0000
Preop albumin -0.43 -0.96 0.3446
Preop glucose* 0.00 -0.37 0.7127

*Additional Intermountain risk factor.

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Page last reviewed December 2012
Internet Citation: Exhibits 59 to 61. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh59-61.html