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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.