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Table 1 Hospital-onset MRSA bloodstream infections – facility level and national (patient level) performance

From: The incidence of MRSA infections in the United States: is a more comprehensive tracking system needed?

Acquisition dates Average facility SIR Average national SIR Number of facilities
1/1/2013 to 9/30/2013 0.95876 0.96766 1666
1/1/2013 to 12/31/2013 0.91540 0.94380 1889
7/1/2013 to 6/30/2014 0.91484 0.91766 1906
10/1/2013 to 9/30/2014 0.89426 0.90195 1904
1/1/2014 to 12/31/2014 0.89134 0.89422 1916
4/1/2014 to 3/31/2015 0.89717 0.90124 1911
7/1/2014 to 6/30/2015 0.92568 0.91835 1899
10/1/2014 to 9/30/2015 0.96378 0.94811 1825
1/1/2015 to 12/31/2015 0.98812 0.98740 1830
  1. Data for National Level Performance was derived from hospitals that also had a calculable SIR. NHSN data from https://data.medicare.gov/data/hospital-compare (SIR: Standardized Infection Ratio) (The Facility Level data standard deviation for acquisition dates 1/1/2014 to 12/31/2014 was 0.7730. The Facility Level data standard deviation for acquisition dates 1/1/2015 to 12/31/2015 was 0.8753. Unpaired t-test P < 0.0003)