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Table 3 Cluster Analysis of Higher Grade* Prostate Cancer Cases – Maryland Cancer Registry, 1992–1997

From: Geographical clustering of prostate cancer grade and stage at diagnosis, before and after adjustment for risk factors

  Radius (km) # Block groups in Cluster # Higher Grade Cases Expected # Higher Grade Cases Observed Relative Risk P Value
Map 2. Unadjusted Analysis       
   Cluster 1 5.99 550 522.5 669 1.28 .001
   Cluster 2 44.93 201 305.3 210 0.69 .001
   Cluster 3 10.34 173 253.9 176 0.69 .004
   Cluster 4 5.93 38 93.8 49 0.52 .017
Map 3. Adjusted Analysis **       
   Cluster 1 14.81 292 487.3 362 0.74 .001
   Cluster 2 54.65 162 247.6 164 0.66 .003
   Cluster 3 8.27 80 99.6 156 1.56 .013
Map 4. Adjusted Analysis ***       
   Cluster 1 6.02 554 444.0 643 1.45 .001
   Cluster 2 48.62 1181 1825.4 1587 0.87 .001
   Cluster 3 30.88 99 155.8 94 0.60 .004
  1. * Among cases with a histologic grade, those cases graded as 3 or 4 vs. 1 or 2.
  2. ** Expected Rate Adjusted for Race, Age, Year of Diagnosis.
  3. *** Expected Rate Adjusted for Age, Race, Year of Diagnosis, and Area-Level Census Characteristics.