Abstract
Evidence has been presented: (1) that the geometric mean is essential to the statistical analysis of the result of the amount of Hg in hair, and (2) that the individual Hg level in hair must be evaluated by the standard deviation of logarithmic values. The Hg level in hair obtained from 1324 inhabitants on Shikoku island showed logarithmic-normal distribution curves, with higher values in males than in females. To verify such a sexual difference, hair samples were obtained from male and female children ( N = 346), teenagers ( N = 300), and adults ( N = 354) living in an agricultural area of Tokushima Prefecture on the island. As the result, males were found to have more Hg than females in sexually mature teenagers and adults ( P < 0.05 by F test) but not in younger children.
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