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Table 2 Spatial scan statistic clusters. Approximate locations with elevated invasive and late-stage prostate or breast cancer incidence according to selected areal units of analysis, Connecticut, 1988–92.

From: Lumping or splitting: seeking the preferred areal unit for health geography studies

  Geocoded Records Coordinates (Lat.; Long.) Area (km2) Population at-risk Cases in Cluster 0/E Distance (km) p-value
Prostate Cancer Incidence        
Block Group 9,028        
1   41.834; -72.727 1,504 254,092 2,651 1.28 Ref. <0.0001
2   41.311; -72.878 0 345 19 7.62   <0.0001
3   41.472; -73.225 0 148 12 6.97   0.0060
4   41.497; -73.218 0 97 13 5.32   0.0316
Tract 9,825        
1   41.823; -72.735 1,297 238,007 2,673 1.26 1.4 <0.0001
2   41.463; -72.153 0 1,461 33 3.35   <0.0001
Town 10,054        
1   41.995; -72.454 6,104 286,450 2,947 1.22 11.1 <0.0001
Breast Cancer Incidence        
Block Group         
1 11,753 41.182; -73.510 573 85,084 952 1.22 Ref. 11,753
2   41.797; -72.775 115 27,066 391 1.31   0.0048
Tract 10,924        
1   41.137; -73.391 854 147,066 1,554 1.21 11.2 <0.0001
2   41.787; -72.660 0 15 6 162.03   <0.0001
3   41.707; -72.647 87 32,358 401 1.26   0.0228
4   41.795; -72.756 64 20,737 284 1.31   0.0305
5   41.894; -72.368 0 2,137 34 2.34   0.0445
Town 12,518        
1   41.960; -73.311 85 402 24 5.85 88.2 <0.0001
2   41.122; -73.346 584 87,795 1,009 1.14   0.0160
Late Stage Prostate Cancer Incidence       
Place of Residence 7,672        
1   41.486; -73.065 2,057 1,651 549 1.19 2.0 0.0070
2   41.061; -73.458 65 72 41 2.04   0.0135
Block Group 7,672        
1   41.501; -73.078 2,218 1,696 563 1.19 Ref. 0.0029
2   41.054; -73.478 44 61 35 2.05   0.0246
Tract 8,346        
1   41.480; -73.075 1,895 1,596 541 1.22 2.4 <0.0001
Town 8,514        
1   41.489; -73.052 1,959 1,932 644 1.19 2.5 <0.0001
Late Stage Breast Cancer Incidence       
Place of Residence 10,227 No significant clusters detected       
Block Group 10,227 41.666; -72.776 center16 105 center68 1.61 Ref. 0.0092
1         
Tract 10,395 No significant clusters detected       
Town 11,854 No significant clusters detected