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Ann. occup. Hyg., Vol. 41, No. 3, pp. 281-286, 1997
© 1997 British Occupational Hygiene Society
Published by Oxford University Press

research-article

LOG-NORMALITY OF DISTRIBUTION OF OCCUPATIONAL EXPOSURE CONCENTRATIONS TO COBALT

Shinji Kumagai*, Yukinori Kusaka{dagger} and Shigeru Goto{ddagger}

*Department of Occupational Health, Osaka Prefectural Institute of Public Health Higashinari-ku, Osaka 537, Japan
{dagger}Department of Environmental Health Fukui Medical School, Matsuoka-cho, Fukui 910–11, Japan
{ddagger}Osaka Prefectural Health Center for Workers Chuo-ku, Osaka 540, Japan

In evaluating occupational exposures, the daily exposure levels of a worker are generally assumed to be distributed log-normally between days. When there are many workers in a job group, the individual worker's arithmetic means are assumed to be distributed log-normally. Using the cobalt exposure data in a hard metal factory, these assumptions were examined with the Shapiro-Wilk W test. The hypothesis of log-normality was accepted in all cases, while the hypothesis of normality was rejected in some cases © 1997 British Occupational Hygiene Society. Published by Elsevier Science Ltd


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