title: Log-normality of distribution of occupational exposure concentrations to cobalt.
abstract: 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.
authors.affiliation: Department of Occupational Health, Osaka Prefectural Institute of Public Health, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Kumagai
authors.forename: Y
authors.initials: Y
authors.lastname: Kusaka
authors.forename: S
authors.initials: S
authors.lastname: Goto
mesh_terms: D003035:Cobalt; D006801:Humans; D016273:Occupational Exposure
chemical_list: D003035:Cobalt