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Table 2 Significant low 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
1 102 587 0.3 0.17 15 0.001
2 297 704 0.8 0.42 4 0.001
3 257 542 0.9 0.47 5 0.001
4 275 541 1 0.51 19 0.001
5 494 722 1.3 0.68 6 0.001
6 339 457 1.4 0.742 1 0.001
7 2 20 0.2 0.1 6 0.019
8 105 166 1.2 0.63 14 0.065
  1. a See Figure 4 for the spatial distribution of the geographically large clusters b Rate ratio c Census Sub-divisions