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. Author manuscript; available in PMC: 2023 Jun 9.
Published in final edited form as: Chemosphere. 2019 Jun 13;234:702–714. doi: 10.1016/j.chemosphere.2019.06.070

Table 2.

Mercury concentrations in human hair. Values expressed as geometric mean in parts per billion (μg/kg) wet weight. Data are compared to thresholds (1 ppm and 5 ppm) similar to Gaxiola-Robles et al. (2014).

Study Hg Species Median Geometric mean Standard error n > 1 ppm n > 5 ppm
This study [THg] 688 658 ± 74 17/70 (24%) 0 (0%)
[MeHg+] 432 395 ± 56 10/70 (14%) 0 (0%)
%MeHg+a 76.3% 60.4% 2.3%
Gaxiola-Robles et al. (Harley et al., 2015) [THg] 1520 1389 463 54/75 (72%) 6/75(8%)

[THg] – concentration of total mercury.

[MeHg+] – concentration of methylmercury.

a

Percent MeHg+ calculated as the slope of the regression (a) where [MeHg] = a • [THg] + b. For further explanation see text and Wagemann et al. (1997).