Property damage and long-term psychological distress after the 2004 Niigata-Chuetsu earthquake in Ojiya, Japan: a community-based study.

BACKGROUND

This study aimed to assess psychological distress (PD) in earthquake-stricken communities with regard to the extent of property damage for 3 years following the 2004 Niigata-Chuetsu earthquake in Japan.

METHODS

Subjects were participants of health check examinations in a community near the epicentre, and included 7097 residents (≥18 years) in 2005, 6586 in 2006 and 6698 in 2007. Interviews assessed PD symptoms and lifestyles. The Kessler Psychological Distress Scale (K10) was used, with scores ≥20 considered as PD. The 137 subdistricts were divided into quartiles according to the proportion of half-completely destroyed houses at cut-offs of 18.9, 30.5 and 66.7%.

RESULTS

The PD prevalence was 17.0% in 2005, 13.2% in 2006 and 11.8% in 2007. In 2005, the more and most heavily damaged groups had significantly higher PD prevalence (OR = 1.5 and 1.4, respectively) than that of the least damaged group with a dose-dependent relationship (P = 0.0005). This association was weaker in 2006 (P = 0.0413) and in 2007 (P = 0.1816).

CONCLUSION

Psychological distress prevalence was high in highly damaged areas, and the prevalence difference between areas with high versus low damage decreases with time. Extensive mental health care in communities with substantial damage should be expected to last 2 years after an earthquake.