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. 2016 Feb 25;6:21850. doi: 10.1038/srep21850

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Copyright © 2016, Macmillan Publishers Limited

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The association of the log of hair zinc concentration with age in children aged 0–15 years (N = 2,685) is shown. Each point represents the corresponding age and log of zinc concentration in the respective subject. The dotted horizontal line represents the −2 S.D. (standard deviation) level of the control reference range for hair zinc concentrations. A significant correlation between the log of zinc concentrations and age was observed in the children (r = 0.298, p < 0.0001).