Fig. 1

Nomogram for predicting discomfort and tolerance. Predictor values: Sex: male = 1,female = 2; Education1: secondary school = 1, other = 0; Education2: higher education = 1, other = 0; Income1: 30,000 – 300,000 Yuan = 1, other = 0; Income2: 300,000 Yuan or higher = 1, other = 0; Expected discomfort: no discomfort = 1, mild discomfort = 2, moderate discomfort = 3, severe discomfort = 4, extreme discomfort = 5; Anxiety before endoscopy: no anxiety = 1, mild anxiety = 2, moderate anxiety = 3, severe anxiety = 4, extreme anxiety = 5