The Self-Depression Scale, abbreviated as sds, is a self-rating scale that reflects a patient’s subjective depressive symptoms. The scale has been widely used in outpatient screening and self-testing of patients. It consists of 20 questions, and the patient’s performance in the past six months is based on which of the 20 questions falls into one of the four categories of “constant, frequent, sometimes, none or occasionally”, and the corresponding score is obtained by adding up the scores of the 20 questions to obtain a total score. If the total score is more than 40, depression may exist. Then the total score was divided by 80 points and multiplied by 100% to get the percentage. 50%-69% was mild depression, 70%-89% was moderate depression, and more than 90% was severe depression. Some of the questions are as follows: 1. I feel emotionally depressed; 2. I do not find it difficult to do things as usual; 3. I do not sleep well at night; 4.