TY - JOUR
T1 - Clinical vs. self-report versions of the quick inventory of depressive symptomatology in a public sector sample
AU - Bernstein, Ira H.
AU - Rush, A. John
AU - Carmody, Thomas J.
AU - Woo, Ada
AU - Trivedi, Madhukar H.
N1 - Funding Information:
This project was funded in part by the National Institute of Mental Health (NIMH), National Institutes of Health (MH-68851 to the University of Texas Southwestern Medical Center at Dallas, A. John Rush, M.D., PI, and by MH-68852 to the University of Texas at Arlington, Ira H. Bernstein, Ph.D., PI). This research was also supported by NIMH Grant MH-53799, the Robert Wood Johnson Foundation, the Meadows Foundation, the Lightner-Sams Foundation, the Nanny Hogan Boyd Charitable Trust, the Texas Department of Mental Health and Mental Retardation, the Center for Mental Health Services, the Betty Jo Hay Distinguished Chair in Mental Health and the Rosewood Corporation Chair in Biomedical Science (AJR), the United States Pharmacopoeia Convention Inc., Mental Health Connections, a partnership between Dallas County Mental Health and Mental Retardation (MHMR) and the Department of Psychiatry of the University of Texas Southwestern Medical Center, which receives funding from the Texas State Legislature and the Dallas County Hospital District and the University of Texas at Austin College of Pharmacy, and the Southwestern Drug Corporation Centennial Fellowship in Pharmacy. The following pharmaceutical companies provided unrestricted educational grants: Abbott Laboratories, AstraZeneca, Bristol-Myers Squibb, Eli Lilly & Company, Forest Laboratories, GlaxoSmithKline, Janssen Pharmaceutica, Novartis, Organon, Pfizer Inc. and WyethAyerst Laboratories Inc.
PY - 2007/4
Y1 - 2007/4
N2 - Objectives: Recent work using classical test theory (CTT) and item response theory (IRT) has found that the self-report (QIDS-SR16) and clinician-rated (QIDS-C16) versions of the 16-item quick inventory of depressive symptomatology were generally comparable in outpatients with nonpsychotic major depressive disorder (MDD). This report extends this comparison to a less well-educated, more treatment-resistant sample that included more ethnic/racial minorities using IRT and selected classical test analyses. Methods: The QIDS-SR16 and QIDS-C16 were obtained in a sample of 441 outpatients with nonpsychotic MDD seen in the public sector in the Texas Medication Algorithm Project (TMAP). The Samejima graded response IRT model was used to compare the QIDS-SR16 and QIDS-C16. Results: The nine symptom domains in the QIDS-SR16 and QIDS-C16 related well to overall depression. The slopes of the item response functions, a, which index the strength of relationship between overall depression and each symptom, were extremely similar with the two measures. Likewise, the CTT and IRT indices of symptom frequency (item means and locations of the item response functions, bi were also similar with these two measures. For example, sad mood and difficulty with concentration/decision making were highly related to the overall depression severity with both the QIDS-C16 and QIDS-SR16. Likewise, sleeping difficulties were commonly reported, even though they were not as strongly related to overall magnitude of depression. Conclusion: In this less educated, socially disadvantaged sample, differences between the QIDS-C16 and QIDS-SR16 were minor. The QIDS-SR16 is a satisfactory substitute for the more time-consuming QIDS-C16 in a broad range of adult, nonpsychotic, depressed outpatients.
AB - Objectives: Recent work using classical test theory (CTT) and item response theory (IRT) has found that the self-report (QIDS-SR16) and clinician-rated (QIDS-C16) versions of the 16-item quick inventory of depressive symptomatology were generally comparable in outpatients with nonpsychotic major depressive disorder (MDD). This report extends this comparison to a less well-educated, more treatment-resistant sample that included more ethnic/racial minorities using IRT and selected classical test analyses. Methods: The QIDS-SR16 and QIDS-C16 were obtained in a sample of 441 outpatients with nonpsychotic MDD seen in the public sector in the Texas Medication Algorithm Project (TMAP). The Samejima graded response IRT model was used to compare the QIDS-SR16 and QIDS-C16. Results: The nine symptom domains in the QIDS-SR16 and QIDS-C16 related well to overall depression. The slopes of the item response functions, a, which index the strength of relationship between overall depression and each symptom, were extremely similar with the two measures. Likewise, the CTT and IRT indices of symptom frequency (item means and locations of the item response functions, bi were also similar with these two measures. For example, sad mood and difficulty with concentration/decision making were highly related to the overall depression severity with both the QIDS-C16 and QIDS-SR16. Likewise, sleeping difficulties were commonly reported, even though they were not as strongly related to overall magnitude of depression. Conclusion: In this less educated, socially disadvantaged sample, differences between the QIDS-C16 and QIDS-SR16 were minor. The QIDS-SR16 is a satisfactory substitute for the more time-consuming QIDS-C16 in a broad range of adult, nonpsychotic, depressed outpatients.
KW - Depressive symptoms
KW - Inventory of depressive symptomatology
KW - Item response theory
KW - Quick inventory of depressive symptomatology
KW - Samejima graded response model
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U2 - 10.1016/j.jpsychires.2006.04.001
DO - 10.1016/j.jpsychires.2006.04.001
M3 - Article
C2 - 16716351
AN - SCOPUS:33845232902
SN - 0022-3956
VL - 41
SP - 239
EP - 246
JO - Journal of Psychiatric Research
JF - Journal of Psychiatric Research
IS - 3-4
ER -