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The Standardized Infection Ratio (SIR) is a summary measure used to compare the infection rate of one group of patients to that of a standard population. It is the actual number of infections divided by the predicted number of infections. The predicted infection rate is the number of infections that would be predicted if the hospital had the same infection rate as a comparison national group. The comparison national population is from the NHSN report: Data summary for 2006 through 2008, issued December 2009 available at here (Acrobat Reader is required to view).
- A SIR =1 means there is no difference between the hospital's actual infection rate and that of the comparison national experience.
- A SIR >1 suggests the hospital has a higher rate of actual infections (i.e., more infections) than the comparison national experience.
- A SIR <1 suggests that the hospital has a lower actual infection rate (i.e., fewer infections) than the comparison national experience.
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Healthcare Associated Infections
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Surgical Site Infections
01/2017 - 12/2017
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