Table 2.
Quartile classification of benzene levels in 649 Harris County census tracts, kriged values versus ASPEN estimates.
| 1999 ASPEN Modeled Estimates | ||||
|---|---|---|---|---|
| 1998-2000 Kriged Predicted Values | Low | Medium-Low | Medium-High | High |
| No. (%) | No. (%) | No. (%) | No. (%) | |
| Low | 91 (56.2) | 43 (26.5) | 20 (12.4) | 8 (4.9) |
| Medium-Low | 11 (6.8) | 66 (40.7) | 50 (31.9) | 35 (21.5) |
| Medium-High | 23 (14.2) | 14 (8.6) | 51 (31.5) | 74 (45.4) |
| High | 37 (22.8) | 39 (24.1) | 41 (25.3) | 46 (28.2) |
| Total | 162 (100.0) | 162 (100.0) | 162 (100.0) | 163 (100.0) |
Note: kappa = 0.26 (95% confidence interval = 0.20, 0.31)