title: Blood lead concentrations: apparent reduction over approximately one decade.
abstract: Blood lead concentrations of male subjects presenting for pre-employment examination during the period 1967-1969 have been compared with those obtained during the period 1978-1980. A statistically significant reduction of the geometric mean value from 20.2 microgram Pb/100 whole blood to 16.6 microgram Pb/100 ml whole blood has been found.
mesh_terms: D006801:Humans; D007854:Lead / Q000097:blood*; D008297:Male; D010808:Physical Examination; D013997:Time Factors
chemical_list: D007854:Lead