Abstract
Background
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.
Keywords
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Article Info
Publication History
Accepted:
November 1,
2002
Received in revised form:
October 29,
2002
Received:
July 2,
2002
Identification
Copyright
© 2003 Society of Biological Psychiatry. Published by Elsevier Inc. All rights reserved.
