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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