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COMMUNITY PSYCHOLOGICAL STRESSOR-INDUCED SECONDARY SEX RATIO DECLINE AFTER A SEISMIC SEQUENCE IN THE GREEK ISLAND OF ZAKYNTHOS

  • JOHN D. TOURIKIS (a1) and ION N. BERATIS (a2)
Summary

The secondary sex ratio (the ratio of boys to girls at birth) may demonstrate a decline following community stress-inducing major destructive events. This study aims to investigate whether or not moderate adverse life events, in conjunction with endogenous psychological characteristics, can induce sufficient community stress to affect the sex ratio. From April 3rd to May 8th 2006 a moderate sized earthquake sequence occurred offshore the Greek island of Zakynthos, which had been hit by a destructive earthquake half a century earlier. The monthly sex ratio after the earthquake sequence was estimated and compared with that of previous and following years. Eleven months after the onset of the earthquakes the sex ratio fell to 1.000, and during the next two months (March and April) it declined further to 0.612. The sex ratio one year before its decline was 1.158 and over a total 6-year period, 3 years before and 3 years after the sequence, it was 1.063; the March–April decline in male births is significant (OR=0.53, 95% CI=0.32–0.86, p=0.013, and OR=0.57, 95% CI=0.36–0.91, p=0.023, respectively). Also, the number of boys relative to girls in March–April 2007 was significantly lower than during the same months 3 years before and after the sequence (OR=0.50, 95% CI=0.31–0.82, p=0.007). The findings suggest that basic biological characteristics, such as the sex ratio, can be affected by psychological stressors interwoven with the pertaining psychology of the population.

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Beratis, N. G., Asimacopoulou, A. & Varvarigou, A. (2008) Association of secondary sex ratio with smoking and parity. Fertility and Sterility 89, 662667.
Catalano, R. A. & Bruckner, T. (2005) Economic antecedents of the Swedish sex ratio. Social Science & Medicine 60, 537543.
Catalano, R., Bruckner, T., Anderson, E. & Gould, J. B. (2005a) Fetal death sex ratios: a test of the economic stress hypothesis. International Journal of Epidemiology 34, 944948.
Catalano, R., Bruckner, T., Gould, J., Eskenazi, B. & Anderson, E. (2005b) Sex ratios in California following the terrorist attacks of September 11, 2001. Human Reproduction 20, 12211227.
Catalano, R., Bruckner, T., Marks, A. R. & Eskenazi, B. (2006) Exogenous shocks to the human sex ratio: the case of September 11, 2001 in New York City. Human Reproduction 21, 31273131.
Chahnazarian, A., Blumberg, B. S. & London, W. T. (1988) Hepatitis B and the sex ratio at birth: a comparative analysis of four populations. Journal of Biosocial Science 20, 357370.
Chen, C. C., Yeh, T. L., Yang, Y. K., Chen, S. J., Lee, I. H., Fu, L. S.et al. (2001) Psychiatric morbidity and post-traumatic symptoms among survivors in the early stage following the 1999 earthquake in Taiwan. Psychiatry Research 105, 1322.
Fenster, L., Katz, D. F., Wyrobek, A. J., Pieper, C., Rempel, D. M., Oman, D. & Swan, S. H. (1997) Effects of psychological stress on human semen quality. Journal of Andrology 18, 194202.
Fukuda, M., Fukuda, K., Shimizu, T. & Møller, H. (1998) Decline in sex ratio at birth after Kobe earthquake. Human Reproduction 13, 23212322.
Fukuda, M., Fukuda, K., Shimizu, T., Yomura, W. & Shimizu, S. (1996) Kobe earthquake and reduced sperm motility. Human Reproduction 11, 12441246.
Goenjian, A. (1993). A mental health relief programme in Armenia after the 1988 earthquake. Implementation and clinical observations. British Journal of Psychiatry 163, 230239.
Goenjian, A. K., Steinberg, A. M., Najarian, L. M., Fairbanks, L. A., Tashjian, M. & Pynoos, R. S. (2000) Prospective study of posttraumatic stress, anxiety, and depressive reactions after earthquake and political violence. American Journal of Psychiatry 157, 911916.
Graffelman, J. & Hoekstra, R. F. (2000) A statistical analysis of the effect of warfare on the human secondary sex ratio. Human Biology 72, 433445.
Hansen, D., Moller, H. & Olsen, J. (1999) Severe periconceptional life events and the sex ratio in offspring: follow up study based on five national registers. British Medical Journal 319, 548549.
Hilsenrath, R. E., Swarup, M., Bischoff, F. Z., Buster, J. E. & Carson, S. A. (1997) Effect of sexual abstinence on the proportion of X-bearing sperm as assessed by multicolor fluorescent in situ hybridization. Fertility and Sterility 68, 510513.
James, W. H. (1984) The sex ratios of black births. Annals of Human Biology 11, 3944.
James, W. H. (1985) The sex ratio of Oriental births. Annals of Human Biology 12, 485487.
James, W. H. (1995) Sex ratios of offspring and the causes of placental pathology. Human Reproduction 10, 14031406.
James, W. H. (1996) Evidence that mammalian sex ratios at birth are partially controlled by parental hormone levels at the time of conception. Journal of Theoretical Biology 180, 271286.
James, W. H. (1999) The status of the hypothesis that the human sex ratio at birth is associated with the cycle day of conception. Human Reproduction 14, 21772178.
James, W. H. (2000a) The sex ratio of children born to women with dermatoses of pregnancy. British Journal of Dermatology 143, 13451346.
James, W. H. (2000b) Analysing data on the sex ratio of human births by cycle day of conception. Human Reproduction 15, 12061208.
James, W. H. (2000c) Why are boys more likely to be preterm than girls? Plus other related conundrums in human reproduction. Human Reproduction 15, 21082111.
James, W. H. (2001) The associated offspring sex ratios and cause(s) of hyperemesis gravidarum. Acta Obstetricia et Gynecologica Scandinavica 80, 378379.
James, W. H. (2009) The variations of human sex ratio at birth during and after wars, and their potential explanations. Journal of Theoretical Biology 257, 116123.
Martin, J. F. (1997) Length of the follicular phase, time of insemination, coital rate and the sex of offspring. Human Reproduction 12, 611616.
Ménézo, Y. J., Chouteau, J., Torelló, J., Girard, A. & Veiga, A. (1999) Birth weight and sex ratio after transfer at the blastocyst stage in humans. Fertility and Sterility 72, 221224.
Saadat, M. (2008) Decline in sex ratio at birth after Bam (Kerman Province, Southern Iran) earthquake. Journal of Biosocial Science 40, 935937.
Sakamoto, M., Nakano, A. & Akagi, H. (2001) Declining Minamata male birth ratio associated with increased male fetal death due to heavy methylmercury pollution. Environmental Research 87, 9298.
Serpetsidaki, A., Sokos, E., Tselentis, G. A. & Zahradnik, J. (2010) Seismic sequence near Zakynthos Island, Greece, April 2006: identification of the activated fault plane. Technophysics 480, 2332.
Shields, M. D., O'Hare, B., Nelson, J., Stewart, M. C. & Coyle, P. (2002) Different sex ratios at birth in Europe and North America. Maternal cytomegalovirus seropositivity affects sex determination. British Medical Journal 325, 334.
Vartiainen, T., Kartovaara, L. & Tuomisto, J. (1999) Environmental chemicals and changes in sex ratio: analysis over 250 years in Finland. Environmental Health Perspectives 107, 813815.
Zorn, B., Sucur, V., Stare, J. & Meden-Vrtovec, H. (2002) Decline in sex ratio at birth after 10-day war in Slovenia: brief communication. Human Reproduction 17, 31733177.
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Journal of Biosocial Science
  • ISSN: 0021-9320
  • EISSN: 1469-7599
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