RESEARCH PAPER
 
KEYWORDS
TOPICS
ABSTRACT
Introduction:
The co-occurrence of chronic pain and cardiometabolic multimorbidity (CMM) is increasingly prevalent among middle-aged and older adults, yet the extent to which CMM shapes the longitudinal course of depressive symptomatology in this population remains poorly understood.

Material and methods:
Data were drawn from the China Health and Retirement Longitudinal Study (CHARLS; participants aged 45 years and older) and the English Longitudinal Study of Ageing (ELSA; participants aged 50 years and older). Group-based trajectory modeling (GBTM) was applied to identify distinct depressive symptom trajectories, and multinomial logistic regression was used to examine associations between CMM and trajectory group membership, with subgroup analyses conducted to assess potential effect modification.

Results:
Three stable depressive symptom trajectories were identified in both cohorts: persistently low-, moderate-, and high-symptom groups. In ELSA, CMM was significantly associated with both moderate- (OR: 1.56, 95% CI: 1.24–1.96) and high-symptom trajectories (OR: 2.20, 95% CI: 1.61–3.02) after full covariate adjustment. In CHARLS, the association was confined to the high-symptom trajectory (OR: 1.39, 95% CI: 1.03–1.86). Subgroup analyses indicated a more pronounced association among female participants in CHARLS and among those younger than 65 years in ELSA.

Conclusions:
CMM is significantly associated with more severe depressive symptom trajectories among middle-aged and older adults with chronic pain, with cross-cohort heterogeneity reflecting differences in population characteristics and sociocultural context. Systematic CMM screening within chronic pain management may help identify individuals at elevated risk for adverse psychological outcomes.
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