Impact of social isolation on mortality and morbidity in 20 high-income, middle-income and low-income countries in five continents

Ryo Naito, Darryl P. Leong, Shrikant Ishver Bangdiwala, Martin McKee, S. V. Subramanian, Sumathy Rangarajan, Shofiqul Islam, Alvaro Avezum, Karen E. Yeates, Scott A. Lear, Rajeev Gupta, Afzalhussein Yusufali, Antonio L. Dans, Andrzej Szuba, Khalid F. Alhabib, Manmeet Kaur, Omar Rahman, Pamela Seron, Rafael Diaz, Thandi PuoaneWeida Liu, Yibing Zhu, Yundong Sheng, Patricio Lopez-Jaramillo, Jephat Chifamba, Ismail Rosnah, Kubilay Karsidag, Roya Kelishadi, Annika Rosengren, Rasha Khatib, Leela Itty K.R. Amma, Syed Iqbal Azam, Koon Teo, Salim Yusuf

Research output: Contribution to journalArticlepeer-review

47 Citations (Scopus)

Abstract

Objective To examine the association between social isolation and mortality and incident diseases in middle-aged adults in urban and rural communities from high-income, middle-income and low-income countries. Design Population-based prospective observational study. Setting Urban and rural communities in 20 high income, middle income and low income. Participants 119 894 community-dwelling middle-aged adults. Main outcome measures Associations of social isolation with mortality, cardiovascular death, non-cardiovascular death and incident diseases. Results Social isolation was more common in middle-income and high-income countries compared with low-income countries, in urban areas than rural areas, in older individuals and among women, those with less education and the unemployed. It was more frequent among smokers and those with a poorer diet. Social isolation was associated with greater risk of mortality (HR of 1.26, 95% CI: 1.17 to 1.36), incident stroke (HR: 1.23, 95% CI: 1.07 to 1.40), cardiovascular disease (HR: 1.15, 95% CI: 1.05 to 1.25) and pneumonia (HR: 1.22, 95% CI: 1.09 to 1.37), but not cancer. The associations between social isolation and mortality were observed in populations in high-income, middle-income and low-income countries (HR (95% CI): 1.69 (1.32 to 2.17), 1.27 (1.15 to 1.40) and 1.47 (1.25 to 1.73), respectively, interaction p=0.02). The HR associated with social isolation was greater in men than women and in younger than older individuals. Mediation analyses for the association between social isolation and mortality showed that unhealthy behaviours and comorbidities may account for about one-fifth of the association. Conclusion Social isolation is associated with increased risk of mortality in countries at different economic levels. The increasing share of older people in populations in many countries argues for targeted strategies to mitigate its adverse effects.

Original languageEnglish
Article numbere004124
JournalBMJ Global Health
Volume6
Issue number3
DOIs
Publication statusPublished - 22 Mar 2021

Keywords

  • public health

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