American Journal of Epidemiology Vol. 121, No. 2: 206-215
Copyright © 1985 by The Johns Hopkins University School of Hygiene and Public Health
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IDENTIFYING PATIENTS AT HIGH RISK OF SURGICAL WOUND INFECTION
A SIMPLE MULTIVARIATE INDEX OF PATIENT SUSCEPTIBILITY AND WOUND CONTAMINATION
1Hospital Infections Program, Center for Infectious Diseases, Centers for Disease Control, Public Health Service, US Department of Health and Human Services Atlanta, GA
Address for reprints: SENIC Project,
Public Inquiries Office, Centers for Disease Control, Atlanta, GA 30333
To predict the likelihood that a patient will develop a surgical wound infection from several risk factors, the authors used information collected on 58,498 patients undergoing operations in 1970 to develop a simple multivariate risk index. Analyzing 10 risk factors with stepwise multiple logistic regression tech niques, they developed a model combining information on four of the risk factors to predict a patient's probability of getting a surgical wound infection. Then, with information collected on another sample of 59,352 surgical patients admitted in 19751976, the validity of this index as a predictor of surgical wound infection risk was verified. With the simplified index, a subgroup, consisting of half the surgical patients, can be identified in whom 90% of the surgical wound infections will develop. By the inclusion of factors measuring therisk due to the patient's susceptibility as well as that due to the level of wound contamination, the simplified index predicts surgical wound infection risk about twice as well as the traditional classification of wound contamination (Goodman-Kruskal G=0.67 vs. 0.36, p<0.0001). Use of this new index might substantially increase the efficiency of routine surgical wound infection surveillance and control.
costs and cost analysis; cross infection; health services research; health surveys; sampling studies; surgical wound infection
2Current address:Division of Epidemiology and Preventive Medicine, Department of Internal Medicine, Southwestern Medical School, University of Texas Health Science Center at Dallas, 5323 Harry Hines Boulevard, Dallas, TX
3Current address: Department of Internal Medicine, University of Washington School of Medicine, Harborview Medical Center, 6010 43rd Street, NE, Seattle, WA
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