|  |  |  | R2 | |
---|---|---|---|---|---|
Covariate | Coefficient | Standard Error (SE) | p-value | Model | Partial |
Benzene (n = 69) |  |  |  | 0.65 |  |
Intercept | 0.052 | 0.188 | 0.783 | Â | -- |
Number of signals within 400 meters | 0.017 | 0.002 | <.0001 | Â | 0.36 |
Length of interstate, state, and county highways within 100 meters (km) | 0.591 | 0.101 | <.0001 | Â | 0.18 |
Reference site mean | 0.799 | 0.340 | 0.022 | Â | 0.03 |
BTEX (n = 67) |  |  |  | 0.70 |  |
Intercept | 0.568 | 0.801 | 0.481 | Â | -- |
Number of signals within 450 meters | 0.074 | 0.009 | <.0001 | Â | 0.34 |
Kernel-weighted smooth of solvent-based industry locations (500 meter radius) | 0.072 | 0.013 | <.0001 | Â | 0.14 |
Reference site mean | 0.873 | 0.328 | 0.010 | Â | 0.03 |
Formaldehyde (n = 69) |  |  |  | 0.83 |  |
Intercept | −0.725 | 0.224 | 0.002 |  | -- |
Reference site mean | 1.209 | 0.119 | <.0001 | Â | 0.28 |
Number of signals within 400 meters | 0.020 | 0.004 | <.0001 | Â | 0.07 |
Road length within 100 meters (km) | 0.561 | 0.112 | <.0001 | Â | 0.07 |
Built space within 100 meters (km2) | 2.477 | 0.716 | 0.001 | Â | 0.03 |