Mediating relationships within the Disablement Process model: a cross-sectional study of the oldest-old

Area of Science:

• Gerontology
• Biopsychosocial Health
• Disability Studies

Background:

• The Disablement Process model outlines how chronic conditions lead to disability in older adults.
• It highlights the roles of pathology, impairment, functional limitations, and disability.
• Psychosocial and contextual factors are recognized as peripheral influences.

Purpose of the Study:

• To test the mediating role of variables within the Disablement Process model.
• To examine how psychosocial variables mediate relationships between impairments and disability.
• To assess the model's effectiveness in predicting disability in the oldest-old.

Main Methods:

• 149 Swedish adults (aged 86, 90, 94) living in the community or institutions participated.
• Participants completed physical and cognitive ability assessments.
• Regression analyses were used to test mediation pathways.

Main Results:

• Physical limitations explained 31-52% of the direct effects between impairments and disability.
• Mastery consistently mediated relationships between impairments and functional limitations, and functional limitations and disability.
• Depression and loneliness also mediated some pathways, but to a lesser extent than mastery.

Conclusions:

• The Disablement Process model effectively describes and predicts disability in the oldest-old.
• Psychosocial variables, particularly mastery, can buffer the progression of disability.
• This supports an integrated biopsychosocial approach to understanding aging and disability.