Reduction in male births among workers exposed to metal fumes.

Abstract
Sir—A number of reports suggest that some occupational exposures of males may alter the gender ratio of their offspring. Reduction in male offspring has been observed after exposures to hyperbaric chambers1 and among professional drivers,2 applicators of dibromochloropropane,3 carbon setters4 and aluminum smelter workers.5 Weijin and Olsen6 have suggested that offspring gender ratio, because of its correlation with reduced fertility, may be a possible epidemiological indicator of reproductive hazards.