The 16-Item quick inventory of depressive symptomatology (QIDS), clinician rating (QIDS-C), and self-report (QIDS-SR): a psychometric evaluation in patients with chronic major depression
Received 2 July 2002; received in revised form 29 October 2002; accepted 1 November 2002.
The 16-item Quick Inventory of Depressive Symptomatology (QIDS), a new measure of depressive symptom severity derived from the 30-item Inventory of Depressive Symptomatology (IDS), is available in both self-report (QIDS-SR16) and clinician-rated (QIDS-C16) formats.
Methods
This report evaluates and compares the psychometric properties of the QIDS-SR16 in relation to the IDS-SR30 and the 24-item Hamilton Rating Scale for Depression (HAM-D24) in 596 adult outpatients treated for chronic nonpsychotic, major depressive disorder.
Results
Internal consistency was high for the QIDS-SR16 (Cronbach’s α = .86), the IDS-SR30 (Cronbach’s α = .92), and the HAM-D24 (Cronbach’s α = .88). QIDS-SR16 total scores were highly correlated with IDS-SR30 (.96) and HAM-D24 (.86) total scores. Item–total correlations revealed that several similar items were highly correlated with both QIDS-SR16 and IDS-SR30 total scores. Roughly 1.3 times the QIDS-SR16 total score is predictive of the HAM-D17 (17-item version of the HAM-D) total score.
Conclusions
The QIDS-SR16 was as sensitive to symptom change as the IDS-SR30 and HAM-D24, indicating high concurrent validity for all three scales. The QIDS-SR16 has highly acceptable psychometric properties, which supports the usefulness of this brief rating of depressive symptom severity in both clinical and research settings.
aDepartment of Psychiatry (AJR, MHT, HMI), University of Texas Southwestern Medical Center, Dallas, Texas USA
bAcademic Computing Services (TJC), University of Texas Southwestern Medical Center, Dallas, Texas, USA
cDepartment of Psychiatry & Behavioral Sciences, Stanford University School of Medicine, Stanford, California,USA (BA, RM)
dDepartment of Psychology, State University of New York at Stony Brook, Stony Brook, New York, USA (DNK)
eDepartment of Psychiatry, Cornell University Medical College and New York State Psychiatric Institute, New York, New York, USA (JCM, JHK)
fDepartment of Psychiatry, Emory University School of Medicine, Atlanta, Georgia, USA (PTN)
gDepartment of Psychiatry, Virginia Commonwealth University, Richmond, Virginia, USA (SK)
hDepartment of Psychiatry, University of Pittsburgh Medical Center and Western Psychiatric Institute and Clinic, Pittsburgh, Pennsylvania, USA (MET)
iDepartment of Psychiatry & Human Behavior, Brown University and Butler Hospital, Providence, Rhode Island, USA (MBK)
Address reprint requests to A. John Rush, M.D., UT Southwestern Medical Center, Department of Psychiatry, 5323 Harry Hines Boulevard, Dallas, TX 75390-9086, USA.
ABSTRACT