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Seasonality updated in 28 European/Mediterranean countries: A continuing enigma
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Objectives:
This report updates birth seasonality for 28 European/Mediterranean countries and evaluates the possible influence of atmospheric clarity/quality on seasonality.
Methods:
Birth data between 1970 and 2011 were adjusted for seasonality and are presented as conceptions.
Results:
Presently, 27 of 28 countries have peak conceptions during the last 3 months of the year, a greater concentration than was previously recognized.
Conclusions:
There is no apparent explanation for the en masse transition of seasonality, particularly the abrupt change in seasonality for nine countries, The frequency of sexual intercourse might be a one determinant while another possibility might be the decadal changes in atmospheric clearness/quality. However, causal relationships cannot be inferred without further study and/or animal experimentation.
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