Read the clinical vignette below. Based on the symptoms described, identify the most likely diagnosis and provide a justification for your choice, citing specific evidence from the text.

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Persistent depressive disorder, also known as dysthymia, is a depressive disorder identified by a long-term, chronic state of sadness.

Persistent Depressive Disorder (Dysthymia)

DSM-IV to DSM-5 Dysthymic Disorder Comparison. Substance Abuse and Mental Health Services Administration.
Rockville (MD): Substance Abuse and Mental Health Services Administration (US); 2016 Jun. https://www.ncbi.nlm.nih.gov/books/NBK519704/table/ch3.t6/

DSM-IV to DSM-5 Dysthymic Disorder Comparison

Persistent Depressive Disorder (PDD), formerly known as dysthymia, is a chronic form of depression diagnosed when an individual experiences a depressed mood for most of the day, on more days than not, for a minimum of two years. In addition to the persistent low mood, a diagnosis requires at least two other symptoms of major depressive disorder. Individuals with PDD are chronically sad and melancholic, but their symptoms do not meet the full criteria for a major depressive episode. However, it is possible for someone with PDD to also experience periods of full-blown major depressive disorder.

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