Table 1.
Characteristics of the Three Cohorts
| Cohort 1 | Cohort 2 | Cohort 3 | |
|---|---|---|---|
| Birth years | 1982–1996 | 1903–1964 | 1965–1972 |
| Age mean (range) | 14 (9–24) | 47 (29–94) | 39 (30–42) |
| No. of females | 830 | 1483 | 697 |
| No. of males | 819 | 462 | 554 |
| Percentage of females with straight hair | 63.5% | 72.6% | 49.1% |
| Percentage of males with straight hair | 71.5% | 69.3% | 56.5% |
| Percentage of females with wavy hair | 27.9% | - | 35.7% |
| Percentage of males with wavy hair | 21.6% | - | 30.9% |
| Percentage of females with curly hair | 8.6% | 27.4% | 15.2% |
| Percentage of males with curly hair | 6.9% | 30.7% | 12.6% |