United States births by gender and race (2003-13, n=45138496) were analysed. The male to female birth ratio varies seasonally. Seasonality may have been disturbed/reduced in most years due to chronic, socioeconomic stress.
ABSTRACTS
Objective: In humans, male births exceed female births. This ratio is conventionally expressed to M/F and is influenced by a large number of factors, including stress. This study was carried out in order to ascertain whether the known seasonal variation in M/F in the United States (peaking in June) is affected by the quadrennial elections (November), and whether any such influences vary by race.
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