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Table 7 Frequency Distribution of VPA Dosage by Hair Color

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

VPA Dose Hair Color
(mg/day)      
  Black Brown Blond Gray Total
200   1    1
300 2 3   1 6
400 1 3   1 5
500 3     3
600 3 3 1   7
700   1    1
800    2   2
900   1    1
1000 1 3   1 5
1500 7 1    8
3000   1    1
Total 17 17 3 3 40