CHILD CARE HEALTH AND DEVELOPMENT, vol.31, no.3, pp.303-308, 2005 (SCI-Expanded)
Background Menarche is one of the most important biologic signals in the life of a woman. Menarche is a biological variable which has a significant genotypic component in girls. In recent years, many studies reporting the earlier onset of menarche owing to the improvement of socio-economic conditions have been published.