The sex ratio at birth in Spain reached very high values (above 108-109 boys per hundred girls) in the early 1980s before returning to normal values at the end of the decade. Why?
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(3) given that there is no evidence of sex-selective abortions, we argue that mothers stopped working, took better care of themselves, etc. when carrying a boy, which fostered the survival of male fetuses;
(2) a strong son preference inherited from the Francoist dictatorship and the availability of prenatal sex determination technologies also pushed the SRB up;
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(1) the expansion of the health system especially benefited the survival of male fetuses (biological weaker than females);