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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.