2.5. Data collection
intestinal laxatives
When patients were recruited, they signed the informed consent form in outpatient setting, and research personnel collected the patients information and filled out the form, including outpatient category, name, ID number, gender, age, contact phone number, intestinal laxatives, main symptoms, and comments, etc. The colonoscopy was performed by Prof Yu En-Da, a renowned colonoscopy specialist in China, with the assistance of experienced nurses (colonoscopy assistants) from the GI Endoscopy Center. The colonoscopy report was completed by Prof Yu En-Da, mainly noting the quality of bowel preparation (QBP), whether the cecum was intubated, and whether the ileocecal valve and appendiceal fossa were observed. Meanwhile, the number, size, location, and pathological type of polyps, as well as the examination time, were recorded. All the polyps resected were processed and analyzed by pathologists, and the pathological results were issued by the same medical center.