Table 6.
Mean Concentration of VPA by Hair Color
| Hair Color | Number of | Mean VPA | Standard |
| Subjects | Concentration | 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 |
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