Protective Role of Caregiver Preparedness on the Relationship between Depression and Quality of Life in Stroke Dyads

Background and Purpose: Depression and quality of life (QOL) have an interdependent and transactional nature in stroke survivor-caregiver dyads. While the strong relationship between depression and physical and emotional QOL in stroke survivor-caregiver dyads is well known, it is less clear if this relationship is moderated by caregiver preparedness, which could easily be targeted with interventions. In this study, we examined the moderating role of caregiver preparedness on the association between depression and QOL in stroke survivor-caregiver dyads. Methods: We used a longitudinal design with follow-ups every 3 months over a 1-year period. Considering the nonindependent nature of the data (survivors and their caregivers), we used multilevel modeling to analyze data at the dyad level. We implemented 4 longitudinal dyadic moderation models (one for each QOL domain: physical, psychological, social, and environmental) using hierarchical linear modeling. Results: A sample of 222 stroke survivor-caregiver dyads was analyzed. Stroke survivors were older (M=70.8, SD=11.9) than their caregivers (M=52.4, SD=13.1). Stroke survivors predominantly had an ischemic stroke, equally distributed by site. Caregivers were primarily female (66%), with a medium to high educational level (57%). Caregiver preparedness significantly moderated the association between survivor depression and survivor psychological (B=0.56, P<0.01) and environmental (B=0.58, P<0.01) QOL at baseline and social QOL over time (B=0.24, P<0.05). Similarly, caregiver preparedness significantly moderated the association between caregiver depression and caregiver physical (B=0.25, P<0.01) and environmental (B=0.18, P<0.05) QOL over time. Conclusions: Caregiver preparedness has a positive influence on both members of the dyad. Assessment of stroke-caregiver preparedness could be helpful to motivate clinicians to develop and implement interventions for stroke survivor-caregiver dyads.