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. 2014 Jan;19(1):64-71.
doi: 10.1007/s12199-013-0355-5. Epub 2013 Sep 5.

Association of geomagnetic disturbances and suicides in Japan, 1999-2010

Harue Tada  1 , Tsutomu Nishimura, Eiji Nakatani, Kazuki Matsuda, Satoshi Teramukai, Masanori Fukushima
Affiliations

Association of geomagnetic disturbances and suicides in Japan, 1999-2010

Harue Tada et al. Environ Health Prev Med. 2014 Jan.

Abstract

Objectives: Previous studies have shown a positive relationship between geomagnetic disturbances and an increased incidence of suicide. The Japanese suicide rate is the ninth highest in the world, but there have been no reports examining the relationship between geomagnetic disturbance and the number of suicides, and, therefore, this paper examines this relationship.

Methods: The number of Japanese suicides per month from January 1999 to December 2010 was obtained, and it was found that a total of 262,596 males and 102,539 females committed suicide during this period. To adjust the other factors which affect the number of suicides, a multiple linear regression analysis with backward elimination was carried out, with the monthly number of suicides as the response variable and the monthly mean K index value, monthly mean number of sunspots, monthly mean unemployment rate, proportion of elderly people (%), monthly mean air pressure (hPa), monthly mean air temperature (°C), monthly mean humidity (%), and monthly mean day length (h) as the explanatory variables.

Results: In the multiple linear regression analysis for males, the monthly mean K index value was associated with the monthly number of suicides, but in females, the monthly mean K index value was not associated with the monthly number of suicides.

Conclusion: In this study, we generated a hypothesis that geomagnetic disturbances may trigger male suicides.

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Figures

Fig. 1
Fig. 1
a Changes in the monthly number of male suicides and monthly K index values from January 1999 to December 2010. b Changes in the monthly number of female suicides and monthly K index values from January 1999 to December 2010. c Monthly mean number of male suicides (mean ± SD) and monthly mean K index value (mean ± SD) by calendar month (January 1999–December 2010). d Monthly mean number of female suicides (mean ± SD) and monthly mean K index value (mean ± SD) by calendar month (January 1999–December 2010). e Changes in the monthly number of male suicides and monthly number of sunspots from January 1999 to December 2010. f Changes in the monthly number of female suicides and monthly number of sunspots from January 1999 to December 2010. g Monthly mean number of male suicides (mean ± SD) and monthly mean number of sunspots (mean ± SD) by calendar month (January 1999–December 2010). h Monthly mean number of female suicides (mean ± SD) and monthly mean number of sunspots (mean ± SD) by calendar month (January 1999–December 2010). i Changes in the monthly number of male suicides and monthly unemployment rate (%) from January 1999 to December 2010. j Changes in the monthly number of female suicides and monthly unemployment rate (%) from January 1999 to December 2010
Fig. 1
Fig. 1
a Changes in the monthly number of male suicides and monthly K index values from January 1999 to December 2010. b Changes in the monthly number of female suicides and monthly K index values from January 1999 to December 2010. c Monthly mean number of male suicides (mean ± SD) and monthly mean K index value (mean ± SD) by calendar month (January 1999–December 2010). d Monthly mean number of female suicides (mean ± SD) and monthly mean K index value (mean ± SD) by calendar month (January 1999–December 2010). e Changes in the monthly number of male suicides and monthly number of sunspots from January 1999 to December 2010. f Changes in the monthly number of female suicides and monthly number of sunspots from January 1999 to December 2010. g Monthly mean number of male suicides (mean ± SD) and monthly mean number of sunspots (mean ± SD) by calendar month (January 1999–December 2010). h Monthly mean number of female suicides (mean ± SD) and monthly mean number of sunspots (mean ± SD) by calendar month (January 1999–December 2010). i Changes in the monthly number of male suicides and monthly unemployment rate (%) from January 1999 to December 2010. j Changes in the monthly number of female suicides and monthly unemployment rate (%) from January 1999 to December 2010
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