It is estimated that around 1 in 10 Americans experience depression at some point in their lives. Major depression affects almost 7% of the US population, with women more likely to develop the condition than men.
Symptoms of depression include feelings of sadness, hopelessness, guilt, loss of interest in hobbies and activities, reduced energy, insomnia, thoughts of death and suicide and suicide attempts.
Depression can have a significant impact on a person's quality of life, and it is the leading cause of disability among individuals in the US aged 15 and older.
At present, the most commonly used tool for screening patients for depression is the Patient Health Questionnaire (PHQ). It requires patients to answer nine questions - such as, "Over the last 2 weeks, have you been feeling tired or having little energy?" - with the aim of pinpointing any indicators of depression.
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