Since 1935 the Bureau of Laboratories of the Baltimore City Health Department has provided a routine laboratory service for the quantitative estimation of lead in blood and other body fluids as an index of abnormal lead absorption in cases of suspected lead poisoning.1 The cooperation of those physicians and hospitals who made use of this service was solicited in order to make available the clinical histories of the persons whose bloods were examined for lead. In this way considerable information was obtained about the local occurrence of both industrial and nonindustrial lead poisoning.
A summary of the incidence of lead poisoning in the city of Baltimore during the period 1931-1940 is shown in table 1. These data were obtained from the following sources: (1) reports of occupational lead poisoning, (2) reports of deaths from lead poisoning and (3) cases ascertained in a follow-up of the blood lead laboratory
McDONALD JM, KAPLAN E. INCIDENCE OF LEAD POISONING IN THE CITY OF BALTIMORE. JAMA. 1942;119(11):870-872. doi:10.1001/jama.1942.02830280016004