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.

The PHQ dataset (Version 2) involves 128 data collaborators from 39 different countries. Now, it includes 105 studies with 46,277 participants.