Impact of endoscopy-based research on quality of life in healthy volunteers

Figure 5 Different symptoms and summary scores due to the endoscopy-based study compared in HV and the control group determined by visual analog scale (VAS) based questionnaires. Every HV completed 5 medication phases with 15 endoscopic examinations. Control population (data previously published in[9], adopted with permission) underwent only one upper GI endoscopy without endoscopic or histological pathology. Maximal complaint score for any symptom or summary scores are 10 and 70, respectively. The absolute symptom value was below the cut-off for presence of the symptom.