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 density | No. clusters | Relative risk, early-stage prostate cancer | P* | |
|---|---|---|---|---|
| >1.0 | <1.0 | |||
| All census tract clusters | ||||
| County population ≥250,000 | 53 | 41 | 12 | <0.0001 |
| County population <250,000 | 44 | 8 | 36 | |
| Clusters with >12.3% black population† | ||||
| County population ≥250,000 | 23 | 18 | 5 | 0.0005 |
| County population <250,000 | 25 | 7 | 18 | |
| Clusters with ≤12.3% black population† | ||||
| County population ≥250,000 | 30 | 23 | 7 | <0.0001 |
| County population <250,000 | 19 | 1 | 18 | |
| Total no. clusters | 97 | 49 | 48 | |