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Table 3 Statistically significant temporal clusters of CDI rates, August 1, 2006 to February 28, 2011

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

Cluster number Period scanned1 Date of cluster (year/month/day) Number of cases Observed/Expected P-value Ribotype (n)
Hospital wide scans
1a 2006-20113 2006/8/1 – 2007/8/31 44 2.22 < 0.001 Not available
2b 2006-20113 2010/3/1 – 2010/12/31 24 2.39 0.001 027 (6), 001 (3), MOH-V (2),
MOH-Y (2),
MOH-AF (1),
MOH-T (1),
CMFA (1),
CMFB (1),
CMFC (1)
3c 20074 2007/4/1 – 2007/8/31 19 1.75 0.025 Not available
4d 20085 2008/9/1 – 2008/10/31 5 4.22 0.041 Not available
5 20094 2009/5/1 – 2009/9/30 8 2.39 0.006 Not available
Service scans
6b Complex care, 2010/4/1 – 2010/5/31 4 10.32 0.04 CMFA (1), CMFB (1), MOH-V (1), 001 (1)
2006-20114,6
7c Intensive care unit, 2007/6/1 – 2007/7/31 4 12.14 0.019 Not available
2006-20114, 7
8a Internal medicine, 2006/8/1 – 2007/8/31 18 2.82 < 0.001 Not available
2006-20113
9c Internal medicine, 20074 2007/4/1 – 2007/8/31 10 2.37 0.001 Not available
10d Internal medicine, 20085 2008/9/1 – 2008/10/31 3 5.78 0.026 Not available
11a Psychiatry, 2006/8/1 – 2007/9/30 9 4.23 < 0.001 Not available
2006-20113
Ward scans
12a M1, 2006-20113 2006/8/1 – 2007/8/31 14 3.41 < 0.001 Not available
13d M1, 2006-20115,8 2008/9/1 – 2008/10/31 3 15.17 0.017 Not available
14c M1, 20074 2007/4/1 – 2007/8/31 9 2.37 0.004 Not available
15a S1, 2006-20114 2006/11/1 – 2006/12/31 4 9.83 0.042 Not available
  1. CDI = Clostridium difficile infection.
  2. n = Number of isolates.
  3. 1Time period over which the scan was conducted.
  4. 2Month and year the significant cluster was identified by the temporal scan statistic.
  5. 3Long duration cluster (7–14 months in length).
  6. 4Short duration cluster (1–6 months in length).
  7. 5Cluster was part of the C. difficile outbreak identified by Infection Prevention and Control personnel.
  8. 6Cluster was also identified in the Complex care department for the 2010 annual analysis.
  9. 7Cluster was also identified in the Intensive care unit for the 2007 annual analysis.
  10. 8Cluster was also identified in M1 in the 2008 annual analysis.
  11. a-dIndicates a cluster identified by >1 temporal scan.