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Table 6 Mean Concentration of VPA by Hair Color

From: The concentration of three anti-seizure medications in hair: the effects of hair color, controlling for dose and age

Hair Color

Number of Subjects

Mean VPA Concentration

Standard Deviation

Black

17

9.65

3.39

Brown

17

7.58

3.30

Blond

3

5.80

1.36

Gray

3

6.08

2.12

Overall Mean

40

8.22

3.37