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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.
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International Journal of Health Geographics

ISSN: 1476-072X