Sex ratio is remarkably constant.

  title={Sex ratio is remarkably constant.},
  author={Eliana Ein-Mor and David Mankuta and Drorith Hochner-Celnikier and A. Hurwitz and Ronit Haimov-Kochman},
  journal={Fertility and sterility},
  volume={93 6},
OBJECTIVE To study whether the sex of the offspring is related to increasing parental age, gravidity, and parity, hypothesizing an altered male-to-female sex ratio with the advancing parental age. DESIGN A large retrospective cohort study. SETTING The study analyzed birth records of Hadassah Hebrew University Medical Center in Jerusalem from June 2003 to December 2006. PATIENT(S) 35,837 birth records were analyzed including 941 multifetal deliveries, excluding foreign inhabitants (n = 744… CONTINUE READING

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