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trend reversal in age of 1st menarche?

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  • Alypius Skinner
    Could this be a fluke? If not, what could account for it? Any ideas? http://www.cicred.ined.fr/rdr/rdr_a/revues/revue69-70/55-69-70_a.html 93.55.57 - English -
    Message 1 of 2 , Feb 28, 2003
      Could this be a fluke? If not, what could account for it? Any ideas?
       
       
      93.55.57 - English - T.C. DANN, Medical Center, University of Warwick, Coventry, CV4 7AL (U.K.), and D.F. ROBERTS, Department of Human Genetics, University of Newcastle Upon Tyne, Newcastle Upon Tyne, NE1 7RU (U.K.)

      Menarcheal Age in University of Warwick Young Women (p. 531-538)

      Data from the final 16 years of a 28-year ongoing survey of menarcheal age are reported. From 1971 onwards, recalled aged at menarche was recorded for all young women entering the University of Warwick. These data show that mean menarcheal age is increasing, a trend which is independent of father's occupation, family size, position of girl in the family, and physique. This continues a similar upward tendency noted in a preceding study in Swansea. It appears that the downward trend to earlier age at menarche of the earlier decades of this century has been replaced by one in the opposite direction. (UNITED KINGDOM, AGE AT MENARCHE)

    • Irwin Silverman
      ... Coventry, CV4 7AL (U.K.), and D.F. ROBERTS, Department of Human Genetics, University of Newcastle Upon Tyne, Newcastle Upon Tyne, NE1 7RU (U.K.)
      Message 2 of 2 , Mar 1, 2003
        On Fri, 28 Feb 2003, Alypius Skinner wrote:

        > Could this be a fluke? If not, what could account for it? Any ideas?

        > 93.55.57 - English - T.C. DANN, Medical Center, University of Warwick,
        Coventry, CV4 7AL (U.K.), and D.F. ROBERTS, Department of Human
        Genetics, University of Newcastle Upon Tyne, Newcastle Upon Tyne, NE1 7RU
        (U.K.) Menarcheal Age in University of Warwick Young Women (p. 531-538)
        > Data from the final 16 years of a 28-year ongoing survey of menarcheal
        age are reported. From 1971 onwards, recalled aged at menarche was
        recorded for all young women entering the University of Warwick. These
        data show that mean menarcheal age is increasing, a trend which is
        > independent of father's occupation, family size, position of girl in
        the family, and physique. This continues a similar upward tendency noted
        in a preceding study in Swansea. It appears that the downward trend to
        > earlier age at menarche of the earlier decades of this century has been
        replaced by one in the opposite direction. (UNITED KINGDOM, AGE AT
        > MENARCHE)

        This is a bit speculative, but might changes in menarche reflect
        an evolved facultative response in humans to changes in population density
        or other signals of more or less availability of resources. This would
        parallel Lack's observations in birds and Calhoun's in rats and fit well
        into Wynne-Edward's theory of the Critical Maximum.
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