A biomarker validation study of prenatal chlorpyrifos exposure within an inner-city cohort during pregnancy.

Results We did not detect TCPy in infant urine, but all other biomarkers showed a highly significant decrease in detection frequencies (χ 2 = 7.8–34.0, p ≤ 0.005) and mean ranks ( p ≤ 0.006, Kruskal–Wallis) among subjects enrolled in 2003–2004 compared with those enrolled in 2001–2002.

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