Offspring sex and pregnancy outcome by length of gestation.

@article{Vatten2004OffspringSA,
  title={Offspring sex and pregnancy outcome by length of gestation.},
  author={Lars J Vatten and Rolv Skjaerven},
  journal={Early human development},
  year={2004},
  volume={76 1},
  pages={
          47-54
        }
}
BACKGROUND It takes a higher number of male than female embryos to produce a live born infant. The unbalanced pregnancy survival by offspring sex may also be reflected in higher proportion of preterm male births, and in unbalanced sex distribution in certain pregnancy conditions, such as preeclampsia. METHODS We used data from the Medical Birth Registry of Norway, a population-based registry that has recorded births since 1967. For this study, we used information on offspring sex and length… CONTINUE READING
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