Table 2.
Mean Concentration of CBZ by Hair Color
| Hair Color | Number of | Mean CBZ | Standard |
| Subjects | Concentration | Deviation | |
| Black | 15 | 17.59 | 5.95 |
| Brown | 15 | 18.05 | 5.74 |
| Blond | 3 | 24.23 | 6.22 |
| Gray | 3 | 13.58 | 3.27 |
| Dyed | 4 | 19.97 | 7.39 |
| Overall Mean | 40 | 18.20 | 6.02 |
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