Table 3.
Results of quasi-Poisson regressions for delayed milestones
| Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | |
|---|---|---|---|---|---|
| # Doctors | −0.18 (−0.97,0.61) | −0.16 (−0.96,0.64) | −0.42 (−1.59,0.75) | −0.46 (−1.58,0.67) | −0.42 (−1.67,0.83) |
| % Poverty | −0.03 (−0.49,0.43) | 0.09 (−0.36,0.54) | 0.30 (−0.33,0.93) | 0.14 (−0.53,0.81) | 0.10 (−0.64,0.84) |
| % Hispanic | 0.24 (−0.20,0.68) | 0.22 (−0.22,0.66) | −0.15 (−0.87,0.57) | −0.16 (−0.86,0.54) | −0.17 (−0.95,0.61) |
| % Black | −0.56 (−1.33,0.22) | −0.48 (−1.24,0.27) | −0.76 (−1.79,0.28) | −0.82 (−1.83,0.18) | −0.69 (−1.86,0.48) |
| % Well water | −0.36 (−0.97,0.24) | −0.37 (−0.98,0.24) | −0.43 (−1.26,0.40) | −0.39 (−1.16,0.38) | −0.33 (−1.15,0.50) |
| % ELWB | −0.17 (−0.88,0.55) | −0.28 (−1.03,0.47) | −0.75 (−1.85,0.35) | −0.60 (−1.64,0.43) | −0.68 (−1.84,0.47) |
| Arsenic | −0.28 (−0.81,0.25) | −0.32 (−0.96,0.33) | 0.05 (−1.01,1.10) | ||
| Lead | −0.10 (−0.03,0.83) | 0.08 (−0.90,1.06) | −0.59 (−3.07,1.90) | ||
| Manganese | 0.39 (0.18,0.61) | 0.39 (0.19,0.60) | −0.18 (−1.43,1.08) | ||
| Arsenic*lead | 0.61 (−2.27,3.49) | ||||
| Arsenic*manganese | −0.27 (−1.61,1.06) | ||||
| Lead*manganese | −1.95 (−6.15,2.25) |
The five models differ by their treatment of the exposure variable. Model 1 includes only arsenic, Model 2 includes only lead, Model 3 includes only manganese, Model 4 includes all three metals; and Model 5 includes all three metals and their interactions. The table reports the estimated log relative risks (beta) and associated 95% confidence intervals. Significant associations are bolded