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This paper presents the results of a polycentric study carried out in seven different areas, organized by the Italian Society of Reference Values (SIVR) for assessing reference values of lead in blood (B-Pb) at the current doses of the metal to general population. The estimated arithmetic mean for B-Pb in males was of 45.1 μg/l and 30.6 μg/l in females; the 95th centile was 100 and 60 for males and...