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Keywords:

  • aged;
  • community-based participatory research;
  • earthquakes;
  • female;
  • psychological stress

We surveyed 3078 sufferers in Tsunan (Niigata), an intermediate and mountainous area of Japan, after the 2011 Northern Nagano Prefecture Earthquake. More subjects reported fear of the earthquake or related anxiety symptoms and insomnia in Tsunan than in the control group. Female sex and older age were found to be risk factors for poor psychological outcome. Those with risk factors should be carefully followed up.