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Table 4 Univariable regression analysis* of variables associated with the rate of CDI cases

From: Detection of Clostridium difficile infection clusters, using the temporal scan statistic, in a community hospital in southern Ontario, Canada, 2006–2011

Variable Description IRR 95% CI P-value
Year 2006 Referent   
  2007 0.48 0.26 – 0.89 0.019
  2008 0.13 0.05 – 0.32 < 0.001
  2009 0.16 0.07 – 0.36 < 0.001
  2010 0.49 0.27 – 0.90 0.022
Season Fall Referent   
  Winter 0.54 0.25 – 1.18 0.121
  Spring 1.33 0.73 – 2.42 0.356
  Summer 1.15 0.63 – 2.07 0.652
Month January Referent   
  February 4.19 0.47 – 37.55 0.200
  March 4.76 0.54 – 41.95 0.160
  April 7.52 0.89 – 62.97 0.063
  May 8.70 1.09 – 69.11 0.041
  June 7.55 0.92 – 61.69 0.059
  July 6.36 0.75 – 53.59 0.089
  August 6.19 0.77 – 50.00 0.087
  September 7.95 1.01 – 62.47 0.049
  October 5.01 0.59 – 41.95 0.137
  November 6.90 0.86 – 55.33 0.069
  December 6.11 0.76 – 49.29 0.089
Service Medicine1 Referent   
  Surgery 1.29 0.27 – 6.31 0.747
  Other2 1.02 0.29 – 3.61 0.973
  1. *Multilevel negative binomial regression model with a random intercept for ward.
  2. CDI = Clostridium difficile infection.
  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.