Table 3.
Relative increase in glyphosate concentrations in house-dust samples associated with pesticide use and other factors, based on a Tobit multivariable regression modela
| Agricultural use within 1 km (kg/km 2 ): | |
| 0< to <1.3 | 1.15 (0.83–1.61) |
| 1.3 to 9.8 | 1.45 (1.03–2.03) |
| > 9.8 | 1.91 (1.36–2.69) |
| p-trend | 0.0003 |
| Pest treatments in last 12 mos. (ever vs. never): | |
| Treatments for bees/wasps/hornets | 1.42 (1.07–1.89) |
| Treatments for lawn/garden weeds | 1.72 (1.37–2.14) |
| Pesticide exposed occupation vs. none | 1.67 (1.18–2.36) |
| Season sample collected (vs. winter) | |
| Fall | 1.60 (1.13–2.25) |
| Spring | 1.20 (0.86–1.67) |
| Summer | 1.67 (1.21–2.31) |
a
Cases N=177 and controls N=221 from the California Childhood Leukemia Study that consented to the tier 2 visit, had adequate dust for measurement of glyphosate and non-missing data for these covariates