Table 2.
Agricultural drift: model parameters for predicting the GMs of dust pesticide concentrations in agricultural homes at varying distances from fields.
| Model | β (SE) | Exp(β) (95% CI) | Between-result variance, in ln μg/g (SE) | Between-pesticide/paper variance, in ln μg/g (SE) |
|---|---|---|---|---|
| All summary measures (n = 52) | — | — | 0.80 (0.21) | 1.56 (0.66) |
| Intercept | 0.15 (0.72) | 1.2 (0.28, 4.8) | — | — |
| Ln(distance in feet) | –0.43 (0.11) | 0.65 (0.52, 0.81) | — | — |
| Herbicides/fungicides (n = 14) | — | — | 2.0 (0.77) | Not estimated |
| Intercept | 0.68 (1.7) | 2.0 (0.07, 52) | — | — |
| Ln(distance in feet) | –0.64 (0.26) | 0.53 (0.32, 0.88) | — | — |
| Insecticides (n = 38) | — | — | 0.33 (0.10) | 1.79 (0.75) |
| Intercept | –0.22 (0.59) | 0.80 (0.25, 2.6) | — | |
| Ln(distance in feet) | –0.30 (0.09) | 0.74 (0.62, 0.88) | — | — |
| Chlorpyrifos (n = 10) | — | — | 0.11 (0.06) | ~ 0 |
| Intercept | –0.43 (0.55) | 0.65 (0.22, 1.9) | — | — |
| Ln(distance in feet) | –0.29 (0.08) | 0.75 (0.64, 0.87) | — | — |
| Note: —, data not available; CI, confidence interval; GM, geometric mean; SE, standard error. Predicted GM at a given distance = dβslope exp(βintercept) (Equation 13). Percent (%) change between distances d1 and d2 = [1 – (d2/d1)βslope] × 100 (Equation 14). | ||||