Hematological changes in sailors from chemical cargo tankers.

Unlabelled: The group investigated consisted of 179 sailors from chemical cargo tankers, with an average age of approximately 40 years and duration of special service of between 2-6 years. They were divided into risk groups in accordance with the exposure index. The study comprised 18 voyages, transporting more than 50 chemical substances, mainly benzene, ethyl benzene, acrylonitrile, aniline, acetone, etc.