Recently colonoscopy has gained importance as screening programs for colon polyp, cancer and inflammatory bowel disease in the United States and other countries. The number of colonoscopy performed has been increased year by year. To make an increased compliance with colonoscopy in both screening and clinical surveillance programs, consideration of anxiety, shame and satisfaction in examinee is regarded to be important. During colonoscopy patients wear conventional single pants where there is no hole for insertion of scope. Patients take off the conventional single pants below the buttocks and expose their buttocks and perianal area during colonoscopy. Exposing perianal and perineal area during colonoscopy can make patients feel shameful and anxious and diminish satisfaction of colonoscopy. Recently considering the factors affecting satisfaction has been regarded to be important because patient satisfaction could be one of the quality indicators for colonoscopy. To diminish shame and anxiety by exposing perianal and perineal area of patients wearing conventional single pants during colonoscopy, we developed novel double pants with a hole in inner pants. Novel double pants are composed of double fabrics from hip to thigh and single fabric under the thigh such as common pants. In the inner pants of double pants, there is a hole for insertion of scope. The hole is 25 cm wide and 15 cm long. The outer pants are same as conventional single pants. If the patients dropped outer pants below hips, only hip and perianal area are exposed through the hole (25cm*15 cm) for insertion of scope without dropping inner pants. Therefore novel double pants minimized the exposed area of hips than conventional single pants because hips are exposed only the hole of inner pants. Smaller exposed area of hips by novel double pants can minimized the shame and anxiety by diminishing exposing perianal and perineal area during colonoscopy. Therefore advantage of novel double pants is decreasing shame and anxiety and increasing satisfaction by minimizing the exposed area of perianal and perineal area compared with conventional single pants. This study is a randomized controlled study. The investigators will survey the examinees older than 20 years who performed the colonoscopy at Severance Hospital from Feb. 2012 to Jul. 2012 to compare the effect on the satisfaction, shame, and anxiety during colonoscopy between the two groups.