Development of a health-related quality-of-life questionnaire for individuals with gastroesophageal reflux disease: a validation study.
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This study was conducted to test the psychometric properties of a newly developed health-related quality-of-life (HRQoL) questionnaire. A total of 172 symptomatic GERD patients completed a 57-item questionnaire (containing the SF-12; symptom frequency/bothersomeness; problems related to activities, sleep, work disability; overall HRQoL; and treatment satisfaction) at baseline, week 1 [retest (N = 25)], and week 4 [follow-up (N = 100)]. Internal-consistency reliability was acceptable for most scales (range: 0.74-0.92). Test-retest reliability was acceptable for most scales (ICC: 0.74-0.85). Construct validity was demonstrated based on observed correlations. Known-groups validity was upheld, as patients who experienced more symptom days and patients who reported higher pain reported worse HRQoL than those with less symptoms or less severe pain. When categorized according to change in pain severity, Guyatt's statistic for the "improved" and "worse" groups demonstrated responsiveness, although many of the scales for the "stable" group were also responsive. In conclusion, the HRQoL questionnaire was found to be reliable, valid, and responsive.