Delivery of Instructions via Bowel Preparation Mobile Phone Application with Artificial Intelligence Based Evaluation System increases Quality of Bowel Preparation

Interventions: Gold Standard:Boston bowel preparation score;Index test:The diagnostic model was established by convolution neural network, and the sensitivity and specificity of the diagnosis model (modeling group) were evaluated. The accuracy of the model was comprehensively evaluated by ROC curve. The accuracy of the model was further evaluated by external validation of independent Primary outcome(s): rate of sufficient bowel preparation Study Design: Sequential