Long-term suicide mortality rates decrease in men and increase in women after the Niigata-Chuetsu earthquake in Japan

Area of Science:

• Disaster Psychiatry
• Public Health
• Epidemiology

Background:

• Earthquakes can cause psychological distress and impact suicide rates.
• Previous research on earthquake-related suicide mortality has yielded inconsistent findings.
• Understanding long-term effects is crucial for disaster mental health response.

Purpose of the Study:

• To investigate the long-term impact of the 2004 Niigata-Chuetsu earthquake on suicide mortality.
• To compare suicide rates in affected and control areas post-earthquake.

Main Methods:

• Comparative analysis of suicide mortality rates.
• Utilized death certificate data from October 1, 1999, to September 30, 2007.
• Examined a 5-year pre-earthquake period and a 3-year post-earthquake period.

Main Results:

• In men, suicide mortality decreased significantly more in the disaster area compared to the control area post-earthquake.
• In women, suicide mortality decreased in the disaster area but decreased more in the control area, indicating a potential increase relative to the control.
• The study found a significant decrease in male suicide mortality in the disaster area (p = 0.0013).

Conclusions:

• Long-term suicide mortality following the Niigata-Chuetsu earthquake showed sex-dependent trends.
• Suicide rates decreased in men but increased in women in the disaster-affected area.
• Future suicide prevention strategies should specifically target women in post-earthquake scenarios.