<qa>  What was the primary outcome of the study?High quality bowel preparation is essential for successful colonoscopy. This study aimed to assess the impact of reinforced education by Wechat or short message service SMS on the quality of bowel preparation. This prospective, endoscopist-blinded, randomized, controlled study was conducted. Reinforced education groups received additional education via reminders by Wechat or SMS 2 days before colonoscopy. The primary outcome was the quality of the bowel preparation according to the Boston Bowel Preparation Scale BBPS. The secondary outcomes included polyp detection rate PDR, adenoma detection rate ADR, tolerance, and subjective feelings of patients. 