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Table 4 Multivariable multilevel* negative binomial regression model of variables associated with the rate of MRSA cases

From: The use of the temporal scan statistic to detect methicillin-resistant Staphylococcus aureus clusters in a community hospital

Variable Description IRR 95% CI P-value
Year 2006 Referent   
  2007 1.12 0.73 – 1.72 0.607
  2008 0.89 0.57 – 1.39 0.611
  2009 1.63 1.08 – 2.46 0.021
  2010 2.62 1.76 – 3.89 < 0.001
  2011 2.14 1.13 – 4.06 0.020
Month January Referent   
  February 1.09 0.70 – 1.71 0.689
  March 1.63 1.04 – 2.57 0.035
  April 1.88 1.22 – 2.91 0.005
  May 1.33 0.83 – 2.15 0.234
  June 0.89 0.53 – 1.51 0.664
  July 1.27 0.79 – 1.06 0.320
  August 1.44 0.92 – 2.26 0.111
  September 1.37 0.87 – 2.17 0.177
  October 1.33 0.84 – 2.10 0.221
  November 1.34 0.85 – 2.12 0.207
  December 1.42 0.91 – 2.23 0.122
Service Medicine1 Referent   
  Surgery 0.95 0.30 – 2.96 0.924
  Other2 0.42 0.17 – 1.05 0.064
  1. *Random intercept for ward.
  2. MRSA = Methicillin-resistant Staphylococcus aureus.
  3. IRR = Incidence rate ratio.
  4. CI = Confidence interval.
  5. 1Included the following departments: intensive care (adult and neonatal), oncology, pediatrics, and internal medicine.
  6. 2Included the following departments: psychiatry, rehabilitation, hospice, childbirth, and nursery.