Table 2.

Clusters of localized-stage prostate cancer and associations between relative risk and population density, with stratification by percent black population: Alabama, Florida, Georgia, and Tennessee, 1999-2001

Weighted population densityNo. clustersRelative risk, early-stage prostate cancerP*
>1.0<1.0
All census tract clusters
    County population ≥250,000534112<0.0001
    County population <250,00044836
Clusters with >12.3% black population
    County population ≥250,000231850.0005
    County population <250,00025718
Clusters with ≤12.3% black population
    County population ≥250,00030237<0.0001
    County population <250,00019118
Total no. clusters974948
  • *Fisher's Exact test.

  • 12.3% of the U.S. population reported race as “Black only” in the 2000 census.

  • *Fisher's Exact test.

  • 12.3% of the U.S. population reported race as “Black only” in the 2000 census.