Factors Associated With Social Isolation in Older Adults: A Systematic Review and Meta-Analysis

Abstract

Objective: Social isolation is a global health issue that affects older adults throughout their lives. This study aimed to identify the factors associated with social isolation in older adults.

Design: Systematic review and meta-analysis.

Setting and participants: Adults aged 60 years and older.

Methods: We searched for observational studies without language restrictions in 11 databases from inception to August 2022. Pooled odds ratio (OR) and 95% CI were calculated using the R software (version 4.2.1). The modified Newcastle-Ottawa Scale was used to evaluate the risk of bias.

Results: Eighteen factors were grouped into 5 themes. The following 13 factors were statistically significant: (1) demographics theme: aged 80 years and older (OR: 2.41; 95% CI: 1.20-4.85), less than or equal to a high school degree (OR: 1.68; 95% CI: 1.44-1.97), smoking (OR: 1.43; 95% CI: 1.18-1.73), and male (OR: 1.38; 95% CI: 1.01-1.89); (2) environment theme: low social support (OR: 7.77; 95% CI: 3.45-17.50) and no homeownership (OR: 1.38; 95% CI: 1.25-1.51); (3) role theme: no social participation (OR: 3.18; 95% CI: 1.30-7.80) and no spouse (OR: 2.61; 95% CI: 1.37-4.99); (4) physical health: hearing loss (OR: 2.78; 95% CI: 1.54-5.01), activities of daily living impairment (OR: 2.38; 95% CI: 1.57-3.61), and poor health status (OR: 1.52; 95% CI: 1.32-1.74); and (5) mental health: cognitive decline (OR: 1.85; 95% CI: 1.40-2.45) and depression (OR: 1.72; 95% CI: 1.21-2.44).

Conclusions and implications: Social isolation in older adults is associated with various factors. Hence, focused intervention should be adopted for older adults. In addition, further longitudinal studies are required to confirm a direct link between multiple factors and social isolation.

Keywords: Aged; meta-analysis; social isolation; systematic review.