March 2012 – Triangle Lake Investigation RESULTS: participants were not exposed to 2,4-D at levels that are expected to cause adverse health effects

_Conclusions

_{(1) None of the urine samples contained atrazine or its metabolites at a concentration above the analytical limit of detection. Therefore, there was no evidence of recent exposure to atrazine at the time of testing.}

_{(2) The concentrations of 2,4-D in urine samples from the EI participants were compared to a national sample from the National Health and Nutrition Examination Survey (NHANES) for people 6 to 59 years old. Based on this comparison, the fraction of the EI participants above the NHANES 75^{th percentile was higher than expected. This suggests an increased exposure relative to the rest of the United States.}}

_{^{(3) Despite an apparent greater exposure than the US population, these data indicate that, at the time of testing, the participants were not exposed to 2,4-D at levels that are expected to cause adverse health effects.}}