The main clinical scales used to assess the severity of depression in patients include the Depression Screening Scale PHQ-9, the Hamilton Depression Inventory-17-item, the Hamilton Depression Inventory-24-item, and the Zong Depression Self-Rating Inventory. Among the above scales, which are more frequently used in clinical work, the easiest and most efficient one is the Depression Screening Scale PHQ-9, which consists of 9 items and assesses the frequency of a certain symptom in the patient within the past two weeks. Topic 1, having no energy or interest in doing something; Topic 2, feeling depressed and frustrated; Topic 3, having difficulty falling asleep, sleeping restlessly or sleeping too much; Topic 4, feeling tired or unenergetic; Topic 5, losing appetite or having too much energy; Topic 6, feeling bad about yourself or feeling like a failure that will let you and your family down; Topic 7, having difficulty focusing on things, such as reading the newspaper or watching TV Topic 8, slow movement and speech to the extent that others have been able to detect, or just the opposite, irritable or fidgety, more angry than usual; Topic 9, the idea of dying or ending yourself in some way. The nine options above are: not at all, for several days, for more than a week, and almost every day, by which the severity of the patient’s depression is assessed.