Sleep Related Questionnaires

Patient Health Questionnaire (PHQ-9)

Name of questionnaire Patient Health Questionnaire (PHQ-9)
Type of questionnaire-description,age Assesses the presence and severity of depressive symptoms
Number of items 9
Number of domains & categories Not applicable
Name of categories/domains   Not applicable
Scaling of items 0-3
Scoring available: with permission or free Use with permission: copyright © Pfizer Inc
Scoring Test-retest reliability Yes 
Scoring Internal consistency Yes, Cronbach's alpha= 0.89
Validity Yes, clinical interview, short-formgeneral health survey, self report
Language English
Translations in other languages (if yes, then list the languages) Spanish
Developer name Robert Spitzer, MD
Developer contact information rls@columbia.edu
Availability of questionnaire: needs permission from developer, cost or freely available Use with permission, terms of use available at http://www.pfizer.com 
Limitations Low positive predictive value
Link to the questionnaire (if available) Click Here to View the Questionaire
Other comments Patient-rated of symptoms over the prior 2 weeks. Score>10 had a sensitivity and specificity of 88%  of for depression
References (original publication) 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. Spitzer RL, Kroenke K, Williams JB. Validation and utility of a selfreport version of PRIME-MD: the PHQ primary care study. JAMA 1999;282:1737– 44.
Minimal clinical diff 5 points
Last Reviewed: June 2016