Sex ratio at birth in Croatia: update

Dario Pavić


There is strong evidence that the sex ratio at birth is partially determined by environmental

and social factors. The modern change in those factors serves as an explanation for the

secular decline in sex ratio at birth in most of the industrialized countries. This article is the

reexamination of the results from my previous communication in which no trend in sex ratio

at birth was established for the Croatian data from 1946 to 2007. The data for the years

2008 to 2011 were added, which didn’t result with the detection of a significant change in sex

ratio at birth by the regression analysis or by the Box-Jenkins time series analysis. Although

the numerous factors associated with the decline in sex ratio at birth did occur during the

studied period (e.g. increased exposure to the environmental pollution through food, air and

water, the rise of the obesity and diabetes incidence, the economic crisis etc.), it appears

that none of them made the measurable impact on sex ratio at birth. Also, the possible

marginally significant decline in sex ratio at birth could be the result of a high sex ratio at

birth immediately after the World War II. The results of this study caution against rapid

generalization of the factors found to influence the sex ratio at birth in the epidemiological

and clinical studies on the population level data.


sex ratio, Croatia, time series, regression,

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