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
Availability of questionnaire: needs permission from developer, cost or freely available Use with permission, terms of use available at 
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