Sample size formulae for estimating the true arithmetic or geometric mean of lognormal exposure distributions

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      <subfield code="a">The purpose of this article is to present simple formulae for calculating the appoximate sample size required to estimate either the true arithmetic or true geometric mean of a lognormal distribution to within a specified accuracy with a specified level of confidence. These formulae should be of interest to the industrial hygienist involved in prospective or cross-sectional studies, or establishing exposure databases to be used to assess long-term changes in worker health status</subfield>
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      <subfield code="a">American Industrial Hygiene Association journal</subfield>
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      <subfield code="t">American Industrial Hygiene Association journal</subfield>
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      <subfield code="g">Vol. 56, nº 3, March 1995 ; p. 219-225</subfield>
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