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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.