Table 3.
Statistically significant temporal clusters of CDI rates, August 1, 2006 to February 28, 2011
| Cluster number | Period scanned 1 | 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 |
CDI = Clostridium difficile infection.
n = Number of isolates.
1Time period over which the scan was conducted.
2Month and year the significant cluster was identified by the temporal scan statistic.
3Long duration cluster (7–14 months in length).
4Short duration cluster (1–6 months in length).
5Cluster was part of the C. difficile outbreak identified by Infection Prevention and Control personnel.
6Cluster was also identified in the Complex care department for the 2010 annual analysis.
7Cluster was also identified in the Intensive care unit for the 2007 annual analysis.
8Cluster was also identified in M1 in the 2008 annual analysis.
a-dIndicates a cluster identified by >1 temporal scan.