The residential soil lead threshold for cleanup in California is 80 ppm.
The new rules also require more rigorous sampling of household tap water and set a slightly lower lead threshold for triggering faster pipe replacement.
Thus the rates of children over the lead threshold and the rates of children in the lowest achievement group are in the same units, i.e. percents.
Because there is no "safe" blood lead threshold for children, and medical treatments are of limited value, the only way to avoid the large economic costs related to lead exposure is primary prevention.
For lead, though there is no blood lead threshold for children by the EPA, the "action level" for clinical interventions was set at 10 μg/dL in 1991 by the CDC.
By comparison, Bonferroni correction and the number of independent tests would lead to thresholds of approximately 1e-07 and 5e-07, respectively.
Lead measurements (threshold, sensing, and impedance) were performed at implant and subsequent follow-ups.
This recommendation combined with our 150 top candidate selection lead to threshold = 0.17 (Additional file 2).
Nonetheless, many children are still at risk because there is no evidence for a lead toxicity threshold.
In the case of nanorods, both size dispersion and nanoparticle orientation may lead to threshold fluence variations.
