Table 6 Regression † for factors associated with arsenic concentration (μg/L) in community water systems (CWS), 2005-2007, San Joaquin Valley, CA (n=464)
Variable | Model Aa | Model Ba | Model Cb | Model D (< 200 Conections) | Model E (≥ 200 Connections) |
|---|---|---|---|---|---|
Constant | 20.0 (6.7, 33.3) | 11.2 (6.1, 16.4) | 9.7 (−11.8, 31.3) | 18.2 (−11.9, 49.1) | 8.7 (−11.7, 49.1) |
% People of Color | −0.01 (−0.11, 0.08) | −0.02 (−.13, 0.09) | −0.17* (−0.36, 0.02) | .03 (−0.09, 0.15) | |
% Home ownership | -.14 (−0.34, 0.05) | −0.27** (−0.50, -0.05) | −0.43** (−0.84, -0.03) | -.19* (−0.40, 0.02) | |
Groundwater or combinedc | 11.4*** (7.5, 15.2) | 11.5*** (6.1, 16.9) | 8.4*** (4.2, 12.6) | ||
Private non-PUC regulatedd | 5.6* (−1.0, 12.2) | 8.5** (0.73, 16.3) | 1.2 (−5.4, 7.9) | ||
Publicd | 6.9** (0.61, 13.11) | 7.5* (−0.76, 15.8) | 6.4* (−0.99, 13.8) | ||
< 200 service connections | 2.6 (−1.2, 6.5) | na | na | ||
2006e | 2.8** (0.52, 5.1) | 4.4** (0.27, 8.4) | 1.8 (−.76, 4.3) | ||
2007e | 1.2 (−0.51, 2.9) | 2.4* (−0.11, 4.9) | .52 (−1.8, 2.9) | ||
Summer/fall | -.27 (−1.9, 1.4) | .43 (−3.1, 4.0) | -.27 (−2.1, 1.5) | ||
Valley f | −1.4 (−6.5, 3.7) | 6.4 (−2.3, 14.9) | −4.4 (−10.6, 1.8) | ||
Foothills f | 6.9* (0.32, 13.5) | 12.1*** (3.9, 20.4) | 5.1 (−1.0, 11.3) |