Age at menarche in rural France

Data upon age at menarche have been collected among 254 schoolgirls of a relatively endogamous rural population in central France. The median age at menarche estimated by probits was 13·05±0·18, SD1·42. This accords well with results obtained from urban samples in the years 1965–68. Both rural and urban samples give a median age 0·5 year earlier than data from a national survey performed in 1950.