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To ensure accuracy of results, a proficiency testing blood sample from the Wisconsin State Laboratory of Hygiene with a target lead value was analyzed with each set of blood samples.
To simplify the analysis, the first or only lead value for each person tested was used.
Because this instrument provides a continuous unbiased point estimate that oscillates around the true bone lead value, negative point estimates are sometimes produced when the true bone lead value is close to zero.
In 1991, the CDC, and subsequently the WHO (1995), further reduced the blood lead value defining undue lead exposure to 10 μg/dL (CDC 1991).
This mean childhood blood lead value has been historically used for comparisons with cognitive and behavioral outcomes (Dietrich et al. 1991, 1993b).
Because the instrument provides a continuous unbiased point estimate (micrograms of lead per gram of bone mineral) that oscillates around the true bone lead value, it sometimes produces negative point estimates when the true bone lead value is close to zero.
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Open image in new window Fig. 5 Contour Map of lead values at five zones of Lucknow city during first (I) and second (II) rainfall.
Lead values were expressed as mean ± SD.
Negative estimates of bone lead concentrations may occur for lead values close to zero.
In the present study we titrated the lead exposures individually to reach target blood lead values.
The tap with high lead values had an aerator that had collected lead solder particles.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com