Self and proxy symptom reporting in glioma patient-caregiver dyads: the role of psychosocial function in rating accuracy.

ABSTRACT

BACKGROUND: Illness-related communication and depressive symptoms within families may play an important role in caregivers' ability to accurately understand patients' symptom burden. We examined the associations between these psychosocial factors and symptom accuracy in patients with glioma and their family caregivers. METHODS: Patients and caregivers (n = 67 dyads) completed measures of depressive symptoms (CES-D), illness communication (CICS), and QOL (SF-36). Patients reported on their own cancer-related symptoms (MDASI-BT) while caregivers reported on their perception of the patients' symptoms (i.e., proxy reporting). Paired t-tests and difference scores were used to test for agreement (absolute value of difference scores between patients and caregiver proxy symptom and interference severity reports) and accuracy (caregiver underestimation, overestimation, or accurate estimation of patient symptom and interference severity). RESULTS: Clinically significant disagreement was found for all means scores of the MDASI-BT subscales except for gastrointestinal symptoms and general symptoms. Among caregivers, 22% overestimated overall symptom severity and 32% overestimated overall symptom interference. In addition, 13% of caregivers underestimated overall symptom severity and 21% of caregivers underestimated overall symptom interference. Patient illness communication was associated with agreement of overall symptom severity (r=-0.27, p = 0.03) and affective symptom subscale (r=-0.34, p < 0.01). Caregivers' reporting of illness communication (r=-0.33, p < 0.01) and depressive symptoms (r = 0.46, p < 0.0001) were associated with agreement of symptom interference. Caregiver underestimating symptom severity was associated with lower patient physical QOL (p < 0.01); caregiver underestimating symptom interference was associated with lower patient physical QOL (p < 0.0001) and overestimating symptom interference was associated with lower patient physical QOL (p < 0.05). Patient and caregiver mental QOL was associated with caregiver underestimating (p < 0.05) and overestimating (p < 0.05) symptom severity. CONCLUSION: The psychosocial context of the family plays an important role in the accuracy of symptom understanding. Inaccurately understanding patients experience is related to poor QOL for both patients and caregivers, pointing to important targets for symptom management interventions that involve family caregivers.