Abstract
Multimorbidity negatively affects health-related quality of life (HRQoL), though the underlying mechanism remained unclear. This study aims to investigate the mediating role of depressive symptoms and multimorbidity treatment burden (MTB) in the association between disease burden and HRQoL in multimorbid patients with hypertension and to determine differences in mediating effects between and within age groups (< 60 years vs. 60 and above). Disease burden, depressive symptoms, MTB, and HRQoL were assessed by self-reported questionnaires. We conducted path analysis with all subjects and multi-group path analyses with two age groups. Results from the path analysis with all subjects (n = 498) showed a significant direct effect of disease burden on HRQoL and a significant indirect effect via depressive symptoms and MTB. No significant differences in mediating effects were found between age groups. However, in the older patients, depressive symptoms had a greater indirect effect than MTB. Our results underscore the importance of addressing both depressive symptoms and MTB in interventions tailored to the patient's age.
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