The adult eosinophilic oesophagitis quality of life questionnaire: a new measure of health-related quality of life.

BACKGROUND: Eosinophilic oesophagitis (EoO) is a chronic disease characterised by significant symptoms and challenging treatment regimens. Health-related quality of life (HRQOL) is a useful way to direct patient care. EoO symptoms and treatment may impact patient HRQOL. Currently, there is no reliable and valid measure of adult EoO patient HRQOL. AIM: To validate the Adult Eosinophilic Oesophagitis Quality of Life (EoO-QOL-A) questionnaire as a measure of HRQOL in this population. METHODS: The EoO patients aged 18-70 recruited via an out-patient GI clinic and two EoO advocacy groups completed the preliminary EoO-QOL-A, demographic and clinical information, and measures of general HRQOL, psychological distress and EoO symptom severity. A subset of patients completed test-retest assessments. Scale reliability, internal consistency, factor structure, concurrent and convergent validity were evaluated. RESULTS: A total of 201 patients have participated. The study sample was primarily Caucasian, college-educated, and evenly split by gender. The average duration of disease was 7 years with duration of symptoms of 26 months prior to diagnosis. Patients reported were using both pharmacological and dietary treatments. Factor analysis yielded a 37-item, 5-factor structure: Eating/Diet Impact, Social Impact, Emotional Impact, Disease Anxiety and Choking Anxiety. The EoO-QOL-A demonstrated excellent internal consistency, split-half and test-retest reliability. Concurrent and convergent validity were supported by moderate correlations with established HRQOL measures, psychological distress and oesophageal symptoms. CONCLUSIONS: The EoO-QOL-A is a valid and reliable disease-specific HRQOL measure for adult EoO patients. Developing the Adult Eosinophilic Oesophagitis Quality of Life is an important step in guiding treatment practices, improving disease education and standardising research protocols.