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 CBZ
Standard
Subjects
Concentration
Deviation
Black
15
17.59
5.95
Brown
18.05
5.74
Blond
3
24.23
6.22
Gray
13.58
3.27
Dyed
4
19.97
7.39
Overall Mean
40
18.20
6.02