Age of menarche in urban Argentinian girls

Abstract
A cross-sectional study in La Plata city, Argentina, yielded a mean age of menarche in 6494 schoolgirls of 12.53 .+-. 0.05 yr, SD 1.22 yr, obtained by probit analysis. These values show a relatively early age of menarche in Argentinian girls as compared to other populations.

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