Natural disasters affect long-term health by directly disrupting or destroying health-care systems and social support. We examined the associations between social support and subjective symptoms (SS) among disaster victims living in their homes approximately 1–2 years after the Great East Japan Earthquake and tsunami on March 11, 2011, which devastated the northeastern Japan seaboard and far inland, focusing on Ishinomaki, Miyagi Prefecture.

The Health and Life Revival Council of Ishinomaki District conducted door-to-door household surveys between April 2012 and January 2013. Replies to 12 questions regarding social support, specifically emotional, informational, and instrumental, were investigated. SS prevalence was calculated as the proportion of those having any of 8 predetermined symptoms including back pain, neck stiffness, sleep difficulty, dizziness, heart palpitations, poor appetite, or stomachache. Logistic regression analysis by sex was used to obtain crude and adjusted odds ratios for the association between SS prevalence and forms of social support.

From 4023 households, self-reported data on 2593 individuals from 1709 households were obtained. SS prevalence was 29.1%. Adjusted logistic regression analysis revealed that instrumental support with others and emotional support with personal and others were specific associated with SS in men and women, respectively.

Our findings suggest that providing social support depending on needs is potentially effective in preventing SS in disaster areas.

The role of the community is becoming increasingly recognized as a crucial determinant of human health, particularly during a disaster and during disaster recovery. To identify disaster-vulnerable communities, we sought factors related to communities in need of support by using census information from before the Great East Japan Earthquake.

We identified vulnerable communities by using a needs-assessment survey conducted 6 to 12 months after the Great East Japan Earthquake in Ishinomaki City, Miyagi Prefecture, as indicated by higher proportions of households with at least 1 of 3 major support needs (medical, elderly, psychological, and dwelling environment). The associations between the need for support and 9 demographic characteristics of the community from census data prior to the Great East Japan Earthquake were examined for 71 communities by use of logistic regression analysis.

The need for elderly support was positively associated with the proportions of aged people (odds ratio [OR]=1.5; 95% confidence interval [CI]: 1.2–1.8) and one-person households (OR=1.3; 95% CI: 1.0–1.7), whereas the need for psychological support was associated with the proportion of people engaged in agriculture (OR=4.6; 95% CI: 1.0–20.7). The proportion of fisheries was negatively associated with the need for dwelling environment support (OR=0.5; 95% CI: 0.3–0.9).

The consideration of simple demographic characteristics from the census may be useful for identifying vulnerable communities and preparing for future disasters. (Disaster Med Public Health Preparedness. 2015;9:19-28)