Table 1: Distributions of racial subgroup in a sampled population of Kermanshah city (West of Iran).
| Racial subgroups | Number | Percent | Mean age at menarche | S.E.M |
| Kurd | 327 | 46.7 | 11.95 | 0.91 |
| Turk | 40 | 5.7 | 11.94 | 1.00 |
| Lor | 36 | 5.1 | 11.50 | 0.82 |
| Fars | 266 | 38 | 11.70 | 0.92 |
| Others | 31 | 4.4 | 11.77 | 0.92 |