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Table 4 Cluster Analysis of Later Stage* 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 # Later Stage Cases Expected # Later Stage Cases Observed Relative Risk P Value
Map 5. Unadjusted Analysis       
   Cluster 1 85.32 1436 1481.0 1743 1.18 .001
   Cluster 2 20.72 88 93.8 182 1.94 .001
   Cluster 3 41.92 291 512.7 366 0.71 .001
   Cluster 4 10.61 316 455.8 325 0.71 .001
Map 6. Adjusted Analysis **       
   Cluster 1 24.71 96 98.3 191 1.94 .001
   Cluster 2 69.96 326 372.5 533 1.43 .001
   Cluster 3 39.82 1208 1633.4 1398 0.86 .001
   Cluster 4 4.12 286 248.4 329 1.32 .029
Map 7. Adjusted Analysis ***       
   Cluster 1 20.65 95 104.9 188 1.79 .001
   Cluster 2 69.96 326 394.8 533 1.35 .001
   Cluster 3 47.90 676 1014.0 831 0.82 .001
  1. * Among cases receiving staging, those cases diagnosed at Stages 2–7 vs. Stage 1.
  2. ** Expected Rate Adjusted for Race, Age, Grade, and Year of Diagnosis.
  3. *** Expected Rate Adjusted for Age, Race, Grade, Year of Diagnosis, and Area-Level Census Characteristics.