PHQ-9 (Patient Health Questionnaire-9)
Objectifies degree of depression severity.
Interpretation
Source: Kroenke K, Spitzer RL, Williams JB. The PHQ-9: validity of a brief depression severity measure. J Gen Intern Med. 2001 Sep;16(9):606-13. PubMed PMID: 11556941; PubMed Central PMCID: PMC1495268.