Abstract
The median age at menarche observed by the status quo method in 1979 and calculated by probits from a sample of 338 girls living in Paris was 12.78 .+-. 0.2 SD = 0.73. This shows a precocity of age at menarche of 0.2 yr for urban French girls since 1965-1966. The comparison between urban and rural girls indicates a precocity of 0.3 yr for the urban sample.

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