Validation of a new instrument to measure disease-related distress among patients with haemophilia.

INTRODUCTION: In patients with haemophilia, general psychological distress as measured by the National Comprehensive Cancer Network (NCCN) distress thermometer has been associated with pain, disability and increased healthcare utilization. AIMS: To develop and validate a measure of haemophilia-related distress. METHODS: After qualitative interviews, the Hemophilia-Related Distress Questionnaire (HRDq) was developed. To validate the HRDq, adults (≥18 years) with haemophilia were enrolled, reported demographic and clinical information, and completed the HRDq and other questionnaires that measured similar constructs. Analysis included factor analysis and assessment of internal consistency using Cronbach's α, convergent validity using Pearson's correlation coefficient, and discriminant validity by comparing subgroups of patients. Test-retest reliability was assessed using an intraclass correlation coefficient (ICC). RESULTS: Among 130 enrolled participants, 126 (median age=32.7 years) completed the 24 item HRDq in a median time of 5.4 minutes with overall HRDq scores ranging from 2 to 83 (median score=31.5; higher scores indicating higher distress). Assessment of convergent validity demonstrated a strong correlation (ρ>.60) of the HRDq total score with the NCCN Distress Thermometer, Haem-A-QoL total Score, and PROMIS-29 Profile social role domain and a mild to moderate correlation with all other questionnaire domains (.3-.59, p < .05). Distress was higher among those who had less education, were not employed, and were disabled and was not significantly different among those with severe compared with non-severe disease. Assessment of test-retest reliability demonstrated an ICC value of .84 (95% CI .71-.91) for the total score. CONCLUSIONS: The HRDq demonstrates good internal consistency, construct and discriminant validity, and retest reliability with a low responder burden.

Disease-related distress among adults with haemophilia: A qualitative study.

INTRODUCTION: Distress related to disease burden has been defined and described among people with chronic diseases including diabetes and cancer. In these populations, disease-specific distress is associated with health outcomes. Haemophilia-related distress is less understood. AIM: To identify qualitative features of haemophilia-related distress among affected adults to ultimately inform the creation of a measurement tool. METHODS: Adults with haemophilia A or B associated with a large haemophilia treatment centre in the south-eastern U.S. were recruited to participate in this qualitative study. Fifteen participants completed semi-structured telephone interviews. Interviews lasted 1-2 hours and explored experiences of distress related to various aspects of haemophilia. Interviews were audio taped, transcribed and coded using NVIVO, software for organizing, managing and analysing qualitative data. Coding was deductive and inductive, and the analysis was thematic. RESULTS: Haemophilia-related distress was broadly related to feelings of isolation and vulnerability which incorporated health system factors, physical functioning, caretaker roles and psychological considerations. Specific features associated with haemophilia-related distress included lack of trust in the knowledge of haemophilia and care provided by staff in community healthcare settings, concerns about the future such as health insurance access and ageing/disability, long-standing feelings of being different from others and feeling like an outsider, treatment burdens and fear of acute bleeds. Protective factors included supportive relationships with family, friends and haemophilia care teams through which participants received practical and emotional support. CONCLUSION: Features of haemophilia-related distress were identified. Results will facilitate distress measurement and intervention efforts to reduce distress in adults with haemophilia.