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The Scientific World Journal
Volume 2012 (2012), Article ID 162017, 3 pages
Research Article

A Decrease in Sex Ratio at Birth Nine Months after the Earthquake in L'Aquila

1Department of Gynecology and Obstetrics, San Salvatore Hospital, L'Aquila, Italy
2Department of Health Sciences, University of L'Aquila, 67100 L'Aquila, Italy

Received 24 April 2012; Accepted 28 May 2012

Academic Editors: T. Levy and H. Taskinen

Copyright © 2012 A. D'Alfonso et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


Introduction. Multiple factors influence the secondary sex ratio (SSR) including stress, which appears to affect mainly the males born. Objective. We evaluate the effects of the earthquake in L'Aquila on the SSR. Materials and Methods. The SSR for the first six months of 2010 was compared to that of the same period of 2008. The chi-square test and Fisher's test were used for the statistical analysis. Results. Nine months after the earthquake, an important reduction in the SSR was recorded: January 2010 versus January 2008 =0.62 versus 0.96. An overall fall in the SSR was also recorded when the first 3 months of 2010 were compared to the first three months of 2008: 0,82 versus 1,11. When the first three months of 2010 were compared with the second three months of 2010, a statistically significant increase of the sex ratio at birth was noted (0,82 versus 1,27).