Summary score for Patient Health Questionnaire 9-item. Each item is scored from 0 to 3, while the total score range from 0 to 27. The PHQ-9 score can be divided into the following categories of increasing severity: Not Clinically significant (0-4), Minimal Symptoms (5-9), Minor depression/Dysthymia/Mild Major Depression (10-14), Moderately Severe Major Depression (15-19), and Severe Major Depression (20-27). Kroenke K et al. 2001 (PubMED ID: 11556941)

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