A second significant reduction also coincided with the second wave of terrorist attacks on 21 July 2005.
Researchers believe that traumatic national events create group integration and greater cohesion in society.
Figures from the Office for National Statistics throughout 2005 were used for the study.
It found that figures for both periods were down 40% - similar to the reduction in both countries after the 11 September 2001 New York attacks. No similar reduction during either period was seen in the previous four years.
- British Journal of Psychiatry, 194: 80-85
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