Highlights
•	Age of depression onset is significantly associated with the presence of mild to moderate depression in Parkinson's disease. 
•	Mood and affective symptoms are markedly elevated in patients with mild to moderate depression.
•	Duration of Parkinson's disease and cognitive impairment are linked to the occurrence of depression in Parkinson's disease. 
•	Early recognition and tailored management are crucial for optimizing care for Parkinson's disease with comorbid depression.