Table 1

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

a See Figure 3 for the spatial distribution of the geographically large clusters b Rate ratio c Census Sub-divisions

Odoi et al. International Journal of Health Geographics 2004 3:11   doi:10.1186/1476-072X-3-11

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