According to the Central Intelligence Agency (CIA) World Factbook (2012) the sex ratio at birth (secondary sex ratio) is approximately 105 boys per hundred girls. This ratio is stable across different populations, regions and time. However, a well-documented deviation from this ‘base-rate’ is the change is sex-ratio during and immediately after armed conflicts. So, in other words, during and after wars more boys are born. This is especially the case during long conflicts with many troops deployed. This strange phenomenon is often termed ‘the returning soldier effect’.
Below the paper I wrote about this fascinating phenomenen (in English). Is it true that after and during a war more boys are born? Is it a fact, or just a myth?
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