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

Figure 3 Changes between different symptoms and summary scores due to the endoscopy-based study determined by visual analog scale (VAS) based questionnaires. Upper endoscopies were performed on days 0, 7 and 14 of each phase. During every medication phase, HV underwent 3 upper endoscopies with multiple biopsies from the antrum, corpus and duodenal bulb. Maximal complaint score for any symptom or summary scores are 10 and 70, respectively. The results are expressed as mean ± SE and analyzed using Friedman's test (P > 0.05 for physical, mental and total-scores).