Preventive medicine reports · 2026
Association between types of social isolation and all-cause mortality among the survivors in the disaster-affected area of the great East Japan earthquake: The RIAS study.
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Kanda Satoru, Takusari Eri, Shimoda Haruki, Sakata Kiyomi, Tanno Kozo, RIAS Study Group
Аннотация
OBJECTIVE: We aimed to determine whether different types of social isolation after a disaster are associated with all-cause mortality, which currently remains unknown, using data from a prospective cohort study of survivors in an area affected by the Great East Japan Earthquake.
METHODS: In total, 9311 participants (3600 men and 5711 women) were followed up from October 1, 2011, to the occurrence of censoring events: death, loss to follow-up, or the end of the follow-up period (December 31, 2017). Social isolation types were assessed using the Lubben Social Network Scale-6 (LSNS-6) Family Subscale and LSNS-6 Friend Subscale (using 5/6 as a cutoff point). Using Cox proportional hazards models, the hazard ratios of all-cause mortality according to the social isolation type (no isolation as the reference) were estimated.
RESULTS: Social isolation from friends, but not from family members, was significantly associated with an increased risk of all-cause mortality (hazard ratio, 1.28; 95% confidence interval, 1.10,1.63).
CONCLUSIONS: Social isolation from friends contributes to an increased risk of all-cause mortality. More focused preventive healthcare and medical support for premature death after a disaster and the preservation of social networks are required for disaster survivors who are socially isolated from friends.
METHODS: In total, 9311 participants (3600 men and 5711 women) were followed up from October 1, 2011, to the occurrence of censoring events: death, loss to follow-up, or the end of the follow-up period (December 31, 2017). Social isolation types were assessed using the Lubben Social Network Scale-6 (LSNS-6) Family Subscale and LSNS-6 Friend Subscale (using 5/6 as a cutoff point). Using Cox proportional hazards models, the hazard ratios of all-cause mortality according to the social isolation type (no isolation as the reference) were estimated.
RESULTS: Social isolation from friends, but not from family members, was significantly associated with an increased risk of all-cause mortality (hazard ratio, 1.28; 95% confidence interval, 1.10,1.63).
CONCLUSIONS: Social isolation from friends contributes to an increased risk of all-cause mortality. More focused preventive healthcare and medical support for premature death after a disaster and the preservation of social networks are required for disaster survivors who are socially isolated from friends.