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Development and validation of a disease-specific treatment satisfaction questionnaire for gastro-oesophageal reflux
Background:
Currently, no disease-specific, patient-based, treatment satisfaction instruments related to gastro-oesophageal reflux disease exist.
Aim:
To develop and validate a treatment satisfaction questionnaire for gastro-oesophageal reflux disease (TSQ-G).
Methods:
A new questionnaire was developed from patient focus groups, clinician input and literature review. A validation study was conducted in treated gastro-oesophageal reflux disease patients. Ancillary measures included the Medical Outcomes Study Short Form-36, Quality of Life in Reflux and Dyspepsia, Gastrointestinal Symptom Rating Scale, Socially Desirable Response Scale, Patient Satisfaction Questionnaire-18 and physician and patient measures of symptoms and satisfaction. Statistical analyses included exploratory factor analysis, Cronbach's alpha, intra-class correlations, analyses of variance and t-tests.
Results:
A total of 198 gastro-oesophageal reflux disease patients participated in the study, with a mean age of 50.7 years, 68% female and 84% Caucasian. The physician-rated severity of gastro-oesophageal reflux disease was mild (32%), moderate (50%) and severe (18%); 83% were on proton pump inhibitors. The final TSQ-G consisted of 28 items with seven sub-scales; Cronbach's alpha ranged from 0.58 to 0.94. Correlations with the expected sub-scales of the ancillary measures were moderate to strong. The TSQ-G sub-scales discriminated significantly between levels of physician-rated disease severity, symptom days and patient and physician ratings of satisfaction.
Conclusions:
The TSQ-G has excellent reliability and construct validity and appears to be a useful tool for the evaluation of treatment satisfaction in gastro-oesophageal reflux disease patients.
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