Table 5.
Geographical clusters of mortality from brain cancer for all adults in the United States, 1986 to 1995
| Approximate Cluster Location | Expected Cases | Observed Cases | RR | P-value |
|---|---|---|---|---|
| Clusters with High Risk | ||||
| C1: Arkansas-Mississippi area | 5322 | 6251 | 1.18 | 0.0001 |
| C2: Western North and South Carolina | 3402 | 3921 | 1.15 | 0.0001 |
| C3: Northern West Coast area, including Seattle | 2835 | 3178 | 1.12 | 0.0001 |
| C4: Centered in Iowa, northern States | 5104 | 5532 | 1.08 | 0.0003 |
| C5: Michigan large lake area, including Detroit | 3605 | 3964 | 1.10 | 0.0003 |
| C6: Southern west Kentucky | 714 | 860 | 1.21 | 0.004 |
| C7: Houston area, Texas | 1720 | 1941 | 1.13 | 0.005 |
| C8: North Florida | 481 | 583 | 1.21 | 0.19 |
| Clusters with Low Risk | ||||
| C9: North New Jersey and New York City area | 5162 | 4124 | 0.80 | 0.0001 |
| C10: South Texas at Mexico border | 476 | 284 | 0.60 | 0.0001 |
| C11: New Mexico, Arizona, and Colorado area | 3115 | 2643 | 0.85 | 0.0001 |
| C12: New York State and Pennsylvania area | 5131 | 4619 | 0.90 | 0.0001 |
| C13: Virginia-West Virginia area | 675 | 529 | 0.78 | 0.0004 |
Abbreviation: RR, relative risk.