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Table 3 Measured mercury concentrations by age category

From: Past mercury exposure and current symptoms of nervous system dysfunction in adults of a First Nation community (Canada)

  N 18–29 y
Median
(min-max)
30–49 y
Median
(min-max)
50+ y
Median
(min-max)
Total
Median
(min-max)
Wilcoxon
test
p-value
Umbilical cord (ppb) 99 3.5
(1.5–10)
5.6
(1–78.5)
5
(1–78.5)
0.023
Childhood Hair Hg (μg/g) 137 0.9
(0.5–2)
0.7
(0.2–16)
2.9
(0.6–15)
1.1
(0.2–16)
<  0.0001
    n (%) n (%) n (%)  
Hair ≥ Hg 5 μg/g
at least once
208 0 27
(22.9%)
49
(74.2%)
76
(36.6%)
<  0.0001