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

Anthony W. McGuire
Brian J. Hall
Bruce Arroll
Christina Van der Feltz-Cornelis
Daniel Shuen Sheng FUNG
Felicity Goodyear-Smith
Flávia L.Osório
Hamid R Baradaran
Henk C van Weert
Kumiko Muramatsu
Marcos Hortes N. Chagas
Nathalie Jette
Paul A. Vöhringer
Tiago N Munhoz
Gregory Carter
Jesse R. Fann
Mary A. Whooley
Federico M. Daray
Miranda T. Schram
Felix Fischer
Thomas N. Hyphantis
Charles H. Bombardier
Khalida Ismail
Aaron Conway
Mitsuhiko Yamada
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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.