Depression (in Adults) (9-item PHQ-9)
0-4 suggests absence of depression; 5-9 suggests mild depression; 10-14 suggests moderate depression; 15-19 suggests moderately severe depression; 20-27 suggests severe depression.
For more information about this tool:
Kroenke K, Spitzer RL, Williams JBW. The PHQ-9: Validity of a brief depression severitymeasure. J Gen Intern Med 2001;16:606-613
Löwe B, Unutzer J, Callahan CM, Perkins AJ, Kroenke K. Monitoring depression treatment outcomes with the Patient Health Questionnaire-9. Med Care 2004;42:1194-1201