Table 13.
Mean Concentration of PHT by Hair Color
| 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 |
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