Depression can be initially judged by the Depression Self-Rating Scale. The Depression Self-Rating Scale, abbreviated as SDS, reflects the subjective feelings of depressed patients and is commonly used to screen depressed patients in outpatient clinics. The 20-question test asks patients how they have felt in the last six months about the above issues, and which of the four is constant, frequent, sometimes, none, or occasional. Each question is given a corresponding score, and the scores for these 20 questions are finally added together to give a final total score. A total score greater than 40 points means that depression exists, and then the total score is divided by 80 points to get the percentage. A percentage of 50%-69% is mild depression, 70%-89% is moderate depression, and greater than or equal to 90% is severe depression.