| pubmed-article:868715 | pubmed:abstractText | Publications on menarcheal age from 1965 to 1974 are reviewed. The menarcheal data are shown on a map, in comparison to a former map, published 1967. It seems, that presently socio-economic conditions are more strongly modifying the action of genetic factors of sexual development than "natural" factors of environment as climate, level of height a.s.o. | lld:pubmed |
