Can economic stress affect secondary sex ratio in Poland?

Elżbieta Żądzińska 1 , Iwona Rosset 1 , Czesław Domański 2 , Bogusław Pawłowski and Artur Mikulec 2
  • 1 Department of Anthropology, University of Lodz, Banacha 12/16, 90-237 Łódź, Poland
  • 2 Department of Statistical Methods, University of Lodz, Rewolucji 1905 r. 41/43, 90-214 Łódź, Poland
  • 3 Institute of Anthropology, Polish Academy of Sciences, Kuźnicza 35, 50-951 Wrocław, Poland
  • 4 Department of Anthropology, University of Wroclaw, Kuźnicza 35, 50-138 Wrocław, Poland

Can economic stress affect secondary sex ratio in Poland?

The ratio of male to female births described as the male proportion is expected to be about 1.06. The secondary sex ratio can be influenced by various stresses experienced by parents (e.g., parents' exposure to chemical and physical pollution, natural phenomena, wars and economic crises). The seminal study in this field speculated that fewer goods and services than needed or desired might sufficiently stress human populations to lower the secondary sex ratio. The main purpose of this study is to examine the relationship between economic stress and the fluctuations of sex ratio at birth in Poland. The statistical analysis was based on annual demographic data obtained from year-books issued by the Central Statistical Office on the overall number of male and female live births in Poland in the years 1956-2005 as well as on the annual data of percentage change in total private consumption. In order to verify the hypothesis that the observed time-series of the secondary sex ratio in Poland declines with deterioration in economic conditions, we constructed mathematical models (ARIMA) of both analyzed phenomena following the statistical procedure proposed by Catalano and Bruckner [2005]. We found a statistically significant decline of SSR in Poland over the last 50 years. The decrease appeared to be stronger in villages than in towns. However, the consumption rate as related to the strength of economic stress had no effect on the fluctuation of the sex ratio at birth.

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