Analytical Quality Requirements in Human Biomonitoring Programs: Trace Elements in Human Blood.

Int J Environ Res Public Health · 2019 · PMC6651690 · PMID 31261622

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only marginally significantno p-value reported

In the case of blood Pb, the difference of 20% between urban and rural populations was revealed to be only marginally significant, which was due to the variability within the rural study group being almost double that of the urban group used in the sample size calculations.

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