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Table 6 Statistically significant temporal clusters of MRSA rates, August 1, 2006 - February 28, 2011

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

Cluster Number

Cluster Description

Date of cluster (year/month/day)

Number of MRSA cases

Observed/Expected

P-value

spa type (n)

Hospital wide scans

 

1

2006-20111

2009/9/1 – 2011/2/28

376

1.55

< 0.001

2(148), 23(3), 26(1), 93(4), 228 (1), 230 (1), 268(4), 387(4), 1178(1)

2

2006-20112,3

2009/3/1 – 2009/4/30

37

1.84

0.038

Not applicable

Service scans

 

3

Acute care, 2006-20113

2010/3/1 – 2010/6/30

6

7.44

0.007

2(1)

4a

Complex care, 2006-20111

2009/2/1 – 2011/1/31

130

1.5

< 0.001

2(43), 23(2), 228(1), 268(1)

5

Intensive care unit, 2006-20112,3

2010/6/1 – 2010/11/30

13

3.06

0.022

2(7), 268(1)

6

Intensive care unit, 2006-20114

2007/10/1 – 2008/1/31

8

4.1

0.038

Not applicable

7b

Internal medicine, 2006-20111

2009/10/1 - 2010/12/31

95

2.0

< 0.001

2(37), 93(2), 387(1)

8

Oncology, 2006-20111

2009/12/1 – 2010/12/31

11

3.42

0.002

2(5)

9c

Psychiatry, 2006-20111

2006/9/1 – 2008/5/31

47

2.36

< 0.001

Not applicable

10c

Psychiatry, 20083

2008/1/1 – 2008/5/31

9

2.16

0.025

Not applicable

11

Rehabilitation, 2006-20112,3,5

2008/7/1 – 2008/7/31

6

6.68

0.035

Not applicable

12

Rehabilitation, 2006-20111

2009/2/1 – 2011/2/28

32

1.57

0.038

2(9), 26(1), 93(1), 268(1)

13d

Surgery, 2006-20111,4

2009/9/1 – 2011/2/28

106

1.74

< 0.001

2(40), 23(1), 93(1), 230(1), 268(1), 387(2)

14e

Surgery, 2006-20111,4

2008/9/1 – 2009/3/31

31

2.08

0.003

Not applicable

15

Surgery, 20072,3

2007/3/1 – 2007/4/30

9

2.83

0.026

Not applicable

16

Surgery, 20073

2007/8/1 – 2007/10/31

8

3.19

0.002

Not applicable

17f

Surgery, 20082,3,4

2008/9/1 – 2008/11/30

18

2.25

0.003

Not applicable

18g

Surgery, 20082,3,4

2008/3/1 – 2008/5/31

12

2.32

0.004

Not applicable

Ward scans

 

19b

M1 (Internal medicine), 2006-20114

2010/1/1 – 2010/5/31

26

2.29

0.009

2(6), 93(1)

20d

S1 (Surgery), 2006-20114

2009/7/1 – 2011/2/28

70

1.74

< 0.001

2(23), 23(1), 93(1), 268(1), 387(2)

21e

S1 (Surgery), 2006-20111

2008/4/1 – 2009/3/31

29

1.96

0.001

Not applicable

22f

S1 (Surgery), 20084

2008/10/1 – 2008/10/31

8

3.91

0.010

Not applicable

23g

S1 (Surgery), 20084

2008/4/1 – 2008/5/31

10

3.16

0.003

Not applicable

24d

S2 (Surgery), 2006-20114

2009/2/1 – 2011/2/28

52

1.56

0.002

2(17), 230(1)

25e

S2 (Surgery), 20084

2008/9/1 – 2008/11/30

7

3.25

0.024

Not applicable

26a

C2 (Complex care), 2006-20111

2010/4/1 – 2011/2/28

27

3.09

< 0.001

2(19), 268(1), 1178(1)

27a

C2 (Complex care), 20102,3

2010/8/1 – 2010/11/30

17

2.04

0.009

2(14), 268(1)

28a

C1 (Complex care), 20093

2009/4/1 – 2009/9/30

11

1.84

0.031

Not applicable

  1. MRSA = Methicillin-resistant Staphylococcus aureus.
  2. n = Number of isolates.
  3. 1Long duration cluster (7–25 months in length).
  4. 2Clusters are potential outbreaks.
  5. 3Short duration cluster (1–6 months in length).
  6. 4Cluster was identified as part of a MRSA outbreak identified by Infection Prevention and Control personnel.
  7. 5Cluster was also identified in the Rehabilitation department for the 2008 annual analysis.
  8. a-gIndicates a cluster identified by >1 temporal scan at the service and ward levels.
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BMC Infectious Diseases

ISSN: 1471-2334

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