Greater intrasex phenotype variability in males than in females is a fundamental aspect of the gender differences in humans.

@article{Lehre2009GreaterIP,
  title={Greater intrasex phenotype variability in males than in females is a fundamental aspect of the gender differences in humans.},
  author={Anne-Catherine Lehre and Knut Petter Lehre and Petter Laake and Niels Christian Danbolt},
  journal={Developmental psychobiology},
  year={2009},
  volume={51 2},
  pages={
          198-206
        }
}
Human studies of intrasex variability have shown that males are intellectually more variable. Here we have performed retrospective statistical analysis of human intrasex variability in several different properties and performances that are unrelated or indirectly related to intelligence: (a) birth weights of nearly 48,000 babies (Medical Birth Registry of Norway); (b) adult weight, height, body mass index and blood parameters of more than 2,700 adults aged 18-90 (NORIP); (c) physical… 

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