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Anemic changes in lead-exposed workers after onset of exposure.

To clarify the quantitative relationship between lead exposure and anemia, a cohort of 179 newly-employed male workers was observed for 5 years after their placement in lead-exposed jobs. The examined items included specific gravity of blood (SG-B), urinary D-aminolevulinic acid (ALA-U), urinary coproporphyrin (CP-U) and blood lead concentration. The blood lead con centration ranged from less than 10 ƒÊg/100 ml up to 80 ƒÊg/100 ml. There were three findings which justified the conclusion that lead exposue may not induce manifest anemia at the level of exposure with blood lead con centration not exceeding 80 ƒÊg/100 ml. First, SG-B had no association with blood lead concentration, while ALA-U exhibited a dose-related increase. Sec ondly, SG-B did not have a negative correlation with blood lead level (r=0.116, p<0.01) and stepwise regression analysis also indicated that blood lead had a slightly positive coefficient as an independent variable. Thirdly, when a case control analysis was applied, there were no differences in ALA-U, CP-U and blood lead levels between low SG-B workers and their matched controls.