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Hum. Reprod. Advance Access originally published online on June 24, 2005
Human Reproduction 2005 20(9):2489-2491; doi:10.1093/humrep/dei097
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© The Author 2005. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions{at}oupjournals.org

Sex ratio at birth and war in Croatia (1991–1995)

O. Polasek1,2,4, I. Kolcic1, B. Kolaric3 and I. Rudan1,2

1 Department of Medical Statistics, Epidemiology and Medical Informatics, ‘Andrija Stampar’ School of Public Health, Medical School, University of Zagreb, Rockefellerova 4, 10 000 Zagreb, Croatia, 2 Department of Public Health Sciences, University of Edinburgh Medical School, Teviot Place, Edinburgh EH8 9AG, UK and 3 Croatian Institute of Public Health, Rockefellerova 7, 10 000 Zagreb, Croatia

4 To whom correspondence should be addressed. Email: opolasek{at}snz.hr

BACKGROUND: We have investigated sex ratio at birth (expressed as the proportion of males) in Croatia before, during and after the war (1991–1995). METHODS: Data for each of 21 counties in Croatia (861 516 births) were collected and pooled into two groups: the first, consisting of the counties unaffected by the war, and the second, comprising the counties affected by war events. Odds ratios of being born as a male were calculated, with being born in a county exposed to war defined as the risk factor. RESULTS: No significant deviations from the expected ratio of 0.514 were found in pre-war, wartime or post-war period at the national level. The ratio was 0.515 during the pre-war and wartime periods, and 0.514 in the post-war period. Comparison of the ratios in the three periods in both affected and unaffected counties revealed no significant increase in the sex ratio. The only significant increase in the sex ratio was registered in two counties unaffected by the warfare. CONCLUSIONS: This study indicates that warfare did not cause a detectable increase of the sex ratio at birth in Croatia, in contrast to what might have been predicted based on earlier reports in the literature.

Key words: birth/male proportion/sex ratio/war


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