Table 1.
Participant baseline characteristics by hair dye use in the ATBC Studya.
| Hair dye nonusers (N = 125) | Hair dye users (N = 75) | p-value | |
|---|---|---|---|
| Age (years) | 59.0 ± 5.0 | 59.0 ± 4.9 | 0.90 |
| Body mass index (kg/m2) | 26.0 ± 3.7 | 26.2 ± 3.1 | 0.69 |
| Cigarettes/day | 19.3 ± 8.7 | 18.6 ± 8.2 | 0.59 |
| Smoking duration (years) | 37.0 ± 9.7 | 36.4 ± 10.2 | 0.68 |
| Education/training above 8th grade (%) | 59.2 | 74.7 | 0.04 |
| Alcohol (ethanol g/day) | 15.4 ± 18.0 | 17.3 ± 15.6 | 0.45 |
| Serum chemistry | |||
| Total cholesterol (mmol/L) | 6.17 ± 1.2 | 6.11 ± 1.2 | 0.73 |
| α-Tocopherol (mg/L) | 11.6 ± 3.1 | 12.6 ± 3.4 | 0.03 |
| β-Carotene (ug/L) | 216 ± 162 | 242 ± 244 | 0.41 |
| Retinol (ug/L) | 563 ± 124 | 594 ± 141 | 0.10 |
| Trial α-tocopherol supplementation (%) | 49.6 | 46.7 | 0.80 |
| Trial β-carotene supplementation (%) | 53.6 | 49.3 | 0.66 |
aMean ± standard deviation (all values except as noted).