Interdependence of health between patients with colorectal cancer and family caregivers: a cross-sectional study

Background: Despite numerous shared health challenges during treatment and recovery, the interdependence of health between patients with colorectal cancer and their family caregivers remains underexplored. This study applied the actor-partner interdependence model (APIM) to examine this dyadic relationship. Methods: This descriptive correlational survey involved patients with colorectal cancer who visited the outpatient department for postoperative follow-up, along with their family caregivers. From 343 consenting participants, responses from 100 matched patient-caregiver pairs were analyzed. Data collection occurred at J Hospital from August 2023 to May 2024. Key variables included the psychological health and quality of life (QoL) of both patients and caregivers, patient self-care, and caregiver contribution to self-care. Statistical analysis was performed using Stata 16.1, with structural equation modeling. Results: The mean age of patients was 65.57 years; 51% were male, 66% had colon cancer, and 34% rectal cancer. The caregivers’ mean age was 56.11 years; 55% were female, and 66% were spouses. The analysis of actor effects showed that the psychological health and QoL of both patients and caregivers independently influenced their respective outcomes. The analysis of partner effects revealed mutual influences between the psychological health of patients and caregivers; moreover, the psychological health of caregivers impacted patients’ self-care. While there was a correlation between the QoL of patients and caregivers, it was not statistically significant in the structural equation modeling. Conclusions: This study underscores the profound interdependence of health between patients with colorectal cancer and their caregivers, revealing significant mutual impacts on psychological health and, to a lesser extent, self-care. These insights suggest the need for targeted interventions to improve both patient recovery and caregiver support, even where some correlations lack statistical significance. Trial registration: Prospectively registered with the Clinical Research Information Service (CRIS) under the Clinical Trial Number KCT0008743 (Registration Date: 2023.08.25).