This study used nationally representative cross-sectional data from the 2020 China Longitudinal Aging Social Survey (CLASS) to examine associations between self-reported multimorbidity and mental health among older adults in China, and to test whether family support and social support moderate that association. Multivariate regression models with interaction terms and marginal effects analyses were applied. Primary findings: multimorbidity is associated with poorer mental health; both family and social support correlate with better mental health, but only family support significantly moderates the multimorbidity–mental health relationship. The moderating effect of family support weakens with age and is not significant in adults aged 80+.
Population aging has increased the prevalence of chronic non-communicable diseases and the occurrence of multimorbidity—commonly defined as two or more chronic conditions in the same individual. Multimorbidity elevates risks for functional disability, greater healthcare use, reduced quality of life, and sustained psychological burden. Prior research documents a negative association between the number of chronic conditions and indicators of mental health such as depression, anxiety, and subjective well-being. However, less is known about how informal interpersonal resources alter or buffer this association.
The analysis draws on the Stress-Buffering Hypothesis, which proposes that psychosocial resources can attenuate the adverse mental health effects of stressors, and on Social Convoy Theory, which differentiates sources of interpersonal support according to emotional closeness and role. The study operationalizes informal support as two distinct dimensions: family support—emotional, instrumental, and financial assistance from close family members—and social support from broader networks such as friends, neighbors, and community contacts. In the Chinese context, family remains a central source of elder care due to cultural norms of filial responsibility, suggesting family support could have a distinct role in psychological adaptation to multimorbidity.
Three contributions were specified: distinguishing family versus social support as moderators, using marginal effects to clarify how support level changes the multimorbidity–mental health link, and conducting age-stratified analyses to evaluate whether the moderating role of family support differs across later-life stages.
Data: CLASS 2020, a nationally representative survey of older adults conducted by the Institute of Gerontology at Renmin University of China. The dataset is available to researchers via formal application; authors report no special access privileges. The study sample, measurement specifics, and covariates were drawn from CLASS 2020 (details reported in the source article).
Measures: Multimorbidity was assessed via self-reported chronic conditions (two or more conditions defined as multimorbidity). Mental health measures and operational definitions of family support and social support were based on CLASS questionnaire items; family support encompassed emotional, instrumental, and financial assistance from close kin, while social support captured assistance from friends, neighbors, and community members.
Statistical approach: Multivariate regression models tested associations between multimorbidity and mental health and included interaction terms between multimorbidity and each support measure to assess moderation. Marginal effects analyses examined how the relationship between multimorbidity and mental health varies across levels of family support. Age-stratified regressions examined differences among adults aged 60–69, 70–79, and 80+.
Primary associations: Self-reported multimorbidity was significantly associated with poorer mental health in the sample of older Chinese adults. Both family support and social support showed positive direct associations with better mental health when modeled as main effects.
Moderation tests: Only family support significantly moderated the link between multimorbidity and mental health; social support did not show a statistically significant moderating effect in interaction models.
Marginal effects: Marginal effects analyses indicated that the negative association between multimorbidity and mental health became progressively stronger as levels of family support increased, indicating a more complex interaction than a simple buffering effect.
Age-stratified findings: The direct association between family support and mental health exhibited a U-shaped pattern across the three age groups. The moderating effect of family support on the multimorbidity–mental health relationship weakened with increasing age and lost statistical significance among adults aged 80 years and older.
Additional details such as model coefficients, significance levels, and sample characteristics were provided in tables and figures in the source article.
Findings extend the Stress-Buffering Hypothesis and Social Convoy Theory in the context of multimorbidity and later-life mental health by distinguishing close family ties from broader social networks. Although both family and social support associate with better mental health directly, only family support exhibited a significant interaction with multimorbidity, and the interaction pattern—where the negative multimorbidity–mental health association strengthened at higher family-support levels—suggests complexity in how family dynamics intersect with chronic disease burden. The attenuation of the moderating role of family support in the oldest group (80+) highlights potential age-related changes in the effectiveness or nature of family resources for psychological adaptation.
Implications include the potential value of integrating family-centered strategies into geriatric care and mental health interventions for older adults living with multimorbidity, while recognizing that the role of family support may differ by age.
Using CLASS 2020, the study documented that multimorbidity is associated with poorer mental health among older adults in China. Both family and social support correlate with better mental health, but only family support significantly moderates the multimorbidity–mental health association. The moderating effect weakens with age and is not statistically significant for adults aged 80 and above. These results support targeted, family-focused approaches in policies and interventions addressing mental health among older adults with multimorbidity.
The source article reports limitations and directions for future research. Data are cross-sectional, which constrains causal inference. Measurement relied on self-reported chronic conditions and survey measures of support and mental health; details on measurement instruments and potential measurement error are described in the full article. The authors note the need for longitudinal research to clarify causal pathways and to explore mechanisms underlying the observed interaction patterns, particularly the age-related attenuation of family support effects. Data access procedures and the absence of declared funding and competing interests are reported in the source.