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Table 1 Significant high rate giardiasis spatial clusters in southern Ontario, 1990–98

From: Investigation of clusters of giardiasis using GIS and a spatial scan statistic

Clustera No. of Cases in cluster Expected No. of cases Annual cases per 100,000 person-yrs Cluster RRb No. of CSDsc P-value
1 936 491 3.7 1.91 1 0.001
2 908 502 3.5 1.81 1 0.001
3 1160 759 3 1.53 124 0.001
4 1102 744 2.9 1.48 60 0.001
5 340 166 4 2.05 1 0.001
6 177 84 4.1 2.12 1 0.001
7 439 290 2.9 1.51 5 0.001
8 23 3 13.5 7 1 0.001
9 16 1 22.3 11.5 1 0.001
10 33 8 7.4 4.34 2 0.001
11 751 586 2.5 1.23 3 0.001
12 21 3 12.2 6.3 1 0.001
13 25 6 7.8 4 1 0.001
14 103 56 3.5 1.83 11 0.001
15 14 2 13.2 6.81 1 0.001
16 21 5 8.2 4.23 1 0.001
17 23 8 5.9 3.06 1 0.001
18 276 212 2.5 1.3 14 0.001
19 96 61 3.1 1.59 2 0.056
20 19 6.3 5.8 3 1 0.082
  1. a See Figure 3 for the spatial distribution of the geographically large clusters b Rate ratio c Census Sub-divisions