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Table 13 Mean Concentration of PHT 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 Mean PHT Standard
  Subjects Concentration Deviation
Black 24 16.35 5.79
Brown 18 16.76 7.68
Blond 8 7.92 2.92
Gray 10 6.55 4.82
Overall Mean 60 13.71 7.32