Problem: Treatment selection for depression is primarily guided by the severity of the condition, which is typically assessed using the PHQ-9 scale. In cases of mild depression, indicated by a PHQ-9 score of less than 10, psychotherapy is preferred as the primary treatment option. Engaging in exercise, specifically 30 to 40 minutes, three to four times a week for at least nine weeks, is also considered a first-line monotherapy. At this stage, antidepressants are generally not recommended. For moderate depression, characterized by a PHQ-9 score ranging from 10 to 14, either antidepressant monotherapy or psychotherapy can serve as appropriate first-line treatments. In fact, combined treatment may offer superior results compared to either therapy alone. In instances of moderately severe to severe depression, represented by a PHQ-9 score of 15 or higher, the recommended approach is to use a combination of pharmacotherapy and psychotherapy, as this dual treatment consistently shows better efficacy than either modality on its own summarize and shorten. Need Assignment Help?