The Patient Health Questionnaire (PHQ) is a 9-question instrument given to patients in a primary care setting to screen for the presence and severity of depression. It is the 9-question depression scale from the Patient Health Questionnaire (PHQ). The results of the PHQ-9 may be used to make a depression diagnosis according to DSM-IV criteria
The PHQ dataset (Version 1) involves 92 data collaborators from 21 different countries. Now, it includes 58 studies with 17,357 participants.