Table 4.
Results of quasi-Poisson regressions for speech/language disorder
| Model 1 | Model 2 | Model 3 | Model 4 | Model 5 | |
|---|---|---|---|---|---|
| # Doctors | 0.08 (−0.01, 0.17) | 0.08 (−0.01, 0.17) | 0.10 (0.02, 0.19) | 0.09 (−0.01, 0.18) | 0.09 (−0.01, 0.18) |
| % Poverty | −0.24 (−0.40, −0.07) | −0.18 (−0.34, −0.03) | −0.22 (−0.37, −0.06) | −0.23 (−0.40, −0.06) | −0.23 (−0.40, −0.06) |
| % Hispanic | −0.11 (−0.26, 0.04) | −0.12 (−0.27, 0.03) | −0.09 (−0.24, 0.07) | −0.09 (−0.25, 0.06) | −0.10 (−0.26, 0.06) |
| % Black | 0.14 (−0.06, 0.34) | 0.15 (−0.05, 0.35) | 0.17 (−0.03, 0.37) | 0.17 (−0.04, 0.37) | 0.18 (−0.03,0.39) |
| % Well water | −0.07 (−0.24, 0.11) | −0.07 (−0.25, 0.10) | −0.05 (−0.23, 0.12) | −0.06 (−0.23, 0.11) | −0.06 (−0.23, 0.12) |
| % ELBW | −0.14 (−0.36, 0.08) | −0.17 (−0.40, 0.06) | −0.13 (−0.35, 0.09) | −0.14 (−0.37, 0.09) | −0.15 (−0.38, 0.09) |
| Arsenic | −0.08 (−0.20, 0.04) | −0.07 (−0.20, 0.05) | −0.02 (−0.31, 0.28) | ||
| Lead | −0.08 (−0.34, 0.19) | −0.10 (−0.37, 0.18) | −0.07 (−0.41, 0.27) | ||
| Manganese | −0.06 (−0.15, 0.03) | −0.05 (−0.14, 0.05) | −0.07 (−0.18, 0.05) | ||
| Arsenic*lead | 0.07 (−0.53, 0.68) | ||||
| Arsenic*manganese | −0.02 (−0.24, 0.20) | ||||
| Lead*manganese | −0.08 (−0.37, 0.21) |
ELWB: Extremely low weight births, 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