Age at menarche of japanese and bolivian girls in a pioneer community of eastern lowland of bolivia
Moriyama, M.; Kashiwazaki, H.; Takemoto T I.; Suzuki, T.
Journal of the Anthropological Society of Nippon 89(3): 379-382
1981
Document Number: 388891
The age at menarche of Japanese and Bolivians living in a colony of Japanese immigrants in eastern Bolivia was examined. Maximum likelihood estimation gave mean menarcheal ages of 13.15 .+-. 1.08 for Japanese girls and of 13.08 .+-. 0.89 for Bolivian girls. The girls are further classified according to the fathers' occupation and the age at menarche of each group also was estimated. For Japanese girls, the difference in the menarcheal age between agriculturist 1 (13.28) and agriculturist 2 (13.19) was negligible; non-agriculturist showed a remarkably younger age at menarche as 11.70. For Bolivian girls, there was a clear difference in the menarcheal age between self-employed (12.72) and employed (13.99).