Loneliness Subtypes and Their Association With Prevalent and Incident Dementia

Area of Science:

• Gerontology
• Cognitive Science
• Social Psychology

Background:

• Loneliness negatively impacts cognition, particularly in older adults.
• Loneliness is often studied as a single entity, overlooking its diverse manifestations.

Purpose of the Study:

• To investigate the relationship between different loneliness subtypes and dementia outcomes.
• To determine if sex moderates the association between loneliness subtypes and dementia.

Main Methods:

• Latent class analysis of data from 8802 older adults in the Health and Retirement Study.
• Identification of four distinct loneliness classes based on social connection and subjective feelings of loneliness.
• Statistical analysis to assess dementia risk across identified loneliness classes, adjusting for covariates.

Main Results:

• Four loneliness classes were identified: Less Lonely and Socially Connected (51.6%), Lonely but Socially Connected (12.6%), Less Lonely but Socially Disconnected (18.0%), and Lonely and Socially Disconnected (17.8%).
• The 'Lonely and Socially Disconnected' group exhibited significantly higher odds of prevalent and incident dementia at baseline, Wave 2, and Wave 3 (ORs ranging from 1.75 to 2.17, p < .001).
• No significant moderation effect of sex was observed on the loneliness-dementia association.

Conclusions:

• Loneliness is a heterogeneous experience, with specific subtypes posing differential risks for dementia.
• The 'Lonely and Socially Disconnected' profile is a critical risk factor for dementia in older adults.
• Findings support the development of targeted cognitive and social interventions based on identified loneliness subtypes.