Association of Cancer Caregiver Stress and Negative Attribution Style With Depressive Symptoms and Cortisol: A Cross-Sectional Study

Abstract

Purpose. We examined the effect of cancer caregiver stress and negative attribution style (NAS) on depressive symptoms and salivary cortisol. Method. The sample came from a hospital bone marrow unit and caregiver support organizations and included 60 informal cancer caregivers (51.7% partners) of cancer patients (provided care for a median of 27.5 hours per week for 12 months) and 46 non-caregiver participants. In this cross-sectional study, participants completed questionnaires assessing NAS and depressive symptoms and provided saliva samples to measure cortisol. Results. Linear regressions demonstrated that cancer caregiver stress (p=0.001) and the cancer caregiver stress by NAS interaction (p=0.017), but not NAS alone (p=0.152), predicted depressive symptoms. Caregivers independent of their NAS and non-caregivers high in NAS reported high depression while non-caregivers low in NAS reported low depression. Neither cancer caregiver stress (p=0.920) nor NAS alone (p=0.114), but their interaction, predicted cortisol (p=0.036). Higher NAS was associated with a higher cortisol in both groups while non-caregivers had higher cortisol than caregivers. Conclusions. If the findings can be replicated, the implementation of interventions to support informal caregivers in managing their chronic stress and modify their NAS appears warranted.