ssiexh44-46.htm

Exhibit 44. Results of logistic regression using the derivation dataset for only appendectomy

Variable	Estimate	tValue	Probability
Intercept	-3.45066	-1.04967	0.31289
History of cancer	0.896303	0.974859	0.32970
Emergency surgery	0.32970	-0.96643	0.33384
Male	0.488666	0.768574	0.768574
Postop admission	2.453247	3.652926	0.00026
Postop hematocrit	-0.17629	-2.12084	0.04042
Postop hemoglobin	0.272209	0.822076	0.42317
Preop hemoglobin	-0.0374	-0.0374	0.79751

Postop = postoperative; Preop = preoperative.

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Exhibit 45. Results of logistic regression using the validation dataset for only appendectomy

Variable	Estimate	tValue	Probability
Intercept	-4.59592	-2.06151	0.04255
History of cancer	0.855832	0.736814	0.46124
Emergency surgery	0.655977	1.172465	0.24101
Male	0.586734	1.019488	0.30824
Postop admission	2.572595	4.931689	0.00000
Postop hematocrit	-0.15581	-1.68912	0.09748
Postop hemoglobin	0.310595	1.163695	0.24698
Preop hemoglobin	-0.04081	-0.31694	0.75426

Postop = postoperative; Preop = preoperative.

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Exhibit 46. Results of logistic regression using the combined dataset for only appendectomy

Variable	Estimate	tValue	Probability
Intercept	-3.90766	-2.4378	0.01642
History of cancer	0.749083	1.068061	0.28549
Emergency surgery	0.130644	0.331969	0.73991
Male	0.619657	1.471467	0.14148
Postop admission	2.515271	6.19406	0.00000
Postop hematocrit	-0.15793	-2.74004	0.00744
Postop hemoglobin	0.304609	1.439065	0.16263
Preop hemoglobin	-0.07631	-0.6829	0.51247

Postop = postoperative; Preop = preoperative.

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Current as of December 2012

Internet Citation: ssiexh44-46.htm. December 2012. Agency for Healthcare Research and Quality, Rockville, MD. http://www.ahrq.gov/research/findings/final-reports/ssi/ssiexh44-46.html