How is depression distinguished from apathy dementia delirium

How is depression distinguished from apathy dementia delirium? 

Apathy (indifference or lack of concern) is not depression (a persistently low mood) but may be a feature of depression.

Depression is often comorbid with dementia and may itself cause cognitive problems (“pseudodementia”), but again a persistently low mood is not characteristic of dementia.

Hypoactive delirium can be distinguished from depression by its (typically) acute onset, fluctuating course, and impaired environmental awareness.

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