Eighty examinees will wear conventional single pants and another eighty examinees will wear novel double pants randomly. Examinees who underwent colonoscopy within 3 years, with history of bowel resection surgery, cancer, colostomy or ileostomy, psychotic disease such as depression, anxiety disorder, obsessive disorder, treated with emergent colonoscopic procedure, and pregnant or lactating women, an illiterate person and foreigners will be excluded. Questionnaires before colonoscopy are educational background, martial status, indication of colonoscopy, examinee's preference of doctor's gender, and State-trait anxiety level of examinee. Questionnaires after colonoscopy are shame and trait anxiety level, and satisfaction of examinee during colonoscopy. We will also investigate colonoscopy specific quality Indicators such as the ASA status (American society of anesthesiologist's physical status), complications, procedure success. Finally we will compare the difference of satisfaction, shame, and anxiety during colonoscopy between examinees wearing novel double pants and conventional single pants