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Use of the National Noscomial Infection Surveillance System Risk Index for Prediction of Mortality: Results of a 6-Year Postdischarge Follow-Up Study

A positive linear trend (P<.001) between the National Noscomial Infection Surveillance system (NNIS) risk index and mortality was observed in 2,848 general surgery patients followed up 6 years after discharge. In stratified analyses, the NNIS risk index predicted mortality in patients with chronic disease (P = .007, by test for trend) but not in the remaining patients.