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Composite International Diagnostic Interview screening scales for DSM-IV anxiety and mood disorders

Published online by Cambridge University Press:  18 October 2012

R. C. Kessler*
Affiliation:
Department of Health Care Policy, Harvard Medical School, Boston, MA, USA
J. R. Calabrese
Affiliation:
Department of Psychiatry, University Hospitals Case Medical Center, Case Western Reserve University, Cleveland, OH, USA
P. A. Farley
Affiliation:
Clinical Services, EPI-Q, Inc., Oakbrook Terrace, IL, USA
M. J. Gruber
Affiliation:
Department of Health Care Policy, Harvard Medical School, Boston, MA, USA
M. A. Jewell
Affiliation:
Clinical Services, EPI-Q, Inc., Oakbrook Terrace, IL, USA
W. Katon
Affiliation:
School of Medicine, University of Washington, Seattle, WA, USA
P. E. Keck Jr.
Affiliation:
Lindner Center of HOPE and Department of Psychiatry, University of Cincinnati College of Medicine, Cincinnati, OH, USA
A. A. Nierenberg
Affiliation:
Depression Clinical and Research Program and the Bipolar Clinic and Research Program, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
N. A. Sampson
Affiliation:
Department of Health Care Policy, Harvard Medical School, Boston, MA, USA
M. K. Shear
Affiliation:
Columbia University School of Social Work, New York, NY, USA
A. C. Shillington
Affiliation:
Clinical Services, EPI-Q, Inc., Oakbrook Terrace, IL, USA
M. B. Stein
Affiliation:
Department of Psychiatry, University of California San Diego, San Diego, CA, USA
M. E. Thase
Affiliation:
Departments of Psychiatry, University of Pennsylvania School of Medicine, Philadelphia Veterans Affairs Medical Center, and the University of Pittsburgh Medical Center, Philadelphia and Pittsburgh, PA, USA
H.-U. Wittchen
Affiliation:
Institute of Clinical Psychology and Psychotherapy, Technische Universität Dresden, Dresden, Germany
*
*Address for correspondence: R. C. Kessler, Ph.D., Department of Health Care Policy, Harvard Medical School, 180 Longwood Avenue, Boston, MA 02115, USA. (Email: Kessler@hcp.med.harvard.edu)

Abstract

Background

Lack of coordination between screening studies for common mental disorders in primary care and community epidemiological samples impedes progress in clinical epidemiology. Short screening scales based on the World Health Organization (WHO) Composite International Diagnostic Interview (CIDI), the diagnostic interview used in community epidemiological surveys throughout the world, were developed to address this problem.

Method

Expert reviews and cognitive interviews generated CIDI screening scale (CIDI-SC) item pools for 30-day DSM-IV-TR major depressive episode (MDE), generalized anxiety disorder (GAD), panic disorder (PD) and bipolar disorder (BPD). These items were administered to 3058 unselected patients in 29 US primary care offices. Blinded SCID clinical reinterviews were administered to 206 of these patients, oversampling screened positives.

Results

Stepwise regression selected optimal screening items to predict clinical diagnoses. Excellent concordance [area under the receiver operating characteristic curve (AUC)] was found between continuous CIDI-SC and DSM-IV/SCID diagnoses of 30-day MDE (0.93), GAD (0.88), PD (0.90) and BPD (0.97), with only 9–38 questions needed to administer all scales. CIDI-SC versus SCID prevalence differences are insignificant at the optimal CIDI-SC diagnostic thresholds (χ21 = 0.0–2.9, p = 0.09–0.94). Individual-level diagnostic concordance at these thresholds is substantial (AUC 0.81–0.86, sensitivity 68.0–80.2%, specificity 90.1–98.8%). Likelihood ratio positive (LR+) exceeds 10 and LR− is 0.1 or less at informative thresholds for all diagnoses.

Conclusions

CIDI-SC operating characteristics are equivalent (MDE, GAD) or superior (PD, BPD) to those of the best alternative screening scales. CIDI-SC results can be compared directly to general population CIDI survey results or used to target and streamline second-stage CIDIs.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 2012 

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References

Altman, DG, Bland, JM (1994). Diagnostic tests 2: Predictive values. British Medical Journal 309, 102.CrossRefGoogle ScholarPubMed
Andrews, G, Hobbs, MJ, Borkovec, TD, Beesdo, K, Craske, MG, Heimberg, RG, Rapee, RM, Ruscio, AM, Stanley, MA (2010). Generalized worry disorder: a review of DSM-IV generalized anxiety disorder and options for DSM-V. Depression and Anxiety 27, 134147.CrossRefGoogle ScholarPubMed
Barkow, K, Maier, W, Üstün, TB, Gansicke, M, Wittchen, HU, Heun, R (2003). Risk factors for depression at 12-month follow-up in adult primary health care patients with major depression: an international prospective study. Journal of Affective Disorders 76, 157169.CrossRefGoogle ScholarPubMed
Barrett, B, Byford, S, Knapp, M (2005). Evidence of cost-effective treatments for depression: a systematic review. Journal of Affective Disorders 84, 113.CrossRefGoogle ScholarPubMed
Beekman, AT, Deeg, DJ, Van Limbeek, J, Braam, AW, De Vries, MZ, Van Tilburg, W (1997). Criterion validity of the Center for Epidemiologic Studies Depression scale (CES-D): results from a community-based sample of older subjects in The Netherlands. Psychological Medicine 27, 231235.CrossRefGoogle Scholar
Broadhead, WE, Leon, AC, Weissman, MM, Barrett, JE, Blacklow, RS, Gilbert, TT, Keller, MB, Olfson, M, Higgins, ES (1995). Development and validation of the SDDS-PC screen for multiple mental disorders in primary care. Archives of Family Medicine 4, 211219.CrossRefGoogle ScholarPubMed
Bruce, SE, Yonkers, KA, Otto, MW, Eisen, JL, Weisberg, RB, Pagano, M, Shea, MT, Keller, MB (2005). Influence of psychiatric comorbidity on recovery and recurrence in generalized anxiety disorder, social phobia, and panic disorder: a 12-year prospective study. American Journal of Psychiatry 162, 11791187.CrossRefGoogle ScholarPubMed
Bunevicius, A, Peceliuniene, J, Mickuviene, N, Valius, L, Bunevicius, R (2007). Screening for depression and anxiety disorders in primary care patients. Depression and Anxiety 24, 455460.CrossRefGoogle ScholarPubMed
Cohen, J (1960). A coefficient of agreement for nominal scales. Educational and Psychological Measurement 20, 3746.CrossRefGoogle Scholar
Committee on Integration to Improve Population Health (2012). Primary Care and Public Health: Exploring Integration to Improve Population Health. National Academy Press: Washington, DC.Google Scholar
Converse, J, Presser, S (1986). Survey Questions: Handcrafting the Standardized Questionnaire. Sage: Thousand Oaks, CA.CrossRefGoogle Scholar
Cook, RJ (1998). Kappa and its dependence on marginal rates. In The Encyclopedia of Biostatistics (ed. Armitage, P. and Colton, T.), pp. 21662168. Wiley: New York, NY.Google Scholar
Dodd, S, Williams, LJ, Jacka, FN, Pasco, JA, Bjerkeset, O, Berk, M (2009). Reliability of the Mood Disorder Questionnaire: comparison with the Structured Clinical Interview for the DSM-IV-TR in a population sample. Australian and New Zealand Journal of Psychiatry 43, 526530.CrossRefGoogle Scholar
Donker, T, van Straten, A, Marks, I, Cuijpers, P (2009). A brief Web-based screening questionnaire for common mental disorders: development and validation. Journal of Medical Internet Research 11, e19.CrossRefGoogle ScholarPubMed
Donker, T, van Straten, A, Marks, I, Cuijpers, P (2011). Quick and easy self-rating of Generalized Anxiety Disorder: validity of the Dutch web-based GAD-7, GAD-2 and GAD-SI. Psychiatry Research 188, 5864.CrossRefGoogle ScholarPubMed
Farvolden, P, McBride, C, Bagby, RM, Ravitz, P (2003). A Web-based screening instrument for depression and anxiety disorders in primary care. Journal of Medical Internet Research 5, e23.CrossRefGoogle ScholarPubMed
First, MB, Spitzer, RL, Gibbon, M, Williams, JBW (2002). Structured Clinical Interview for DSM-IV Axis I Disorders, Research Version, Non-Patient Edition (SCID-I/NP). Biometrics Research, New York State Psychiatric Institute: New York, NY.Google Scholar
Gaynes, BN, DeVeaugh-Geiss, J, Weir, S, Gu, H, MacPherson, C, Schulberg, HC, Culpepper, L, Rubinow, DR (2010). Feasibility and diagnostic validity of the M-3 checklist: a brief, self-rated screen for depressive, bipolar, anxiety, and post-traumatic stress disorders in primary care. Annals of Family Medicine 8, 160169.CrossRefGoogle ScholarPubMed
Gibbons, LE, Feldman, BJ, Crane, HM, Mugavero, M, Willig, JH, Patrick, D, Schumacher, J, Saag, M, Kitahata, MM, Crane, PK (2011). Migrating from a legacy fixed-format measure to CAT administration: calibrating the PHQ-9 to the PROMIS depression measures. Quality of Life Research 20, 13491357.CrossRefGoogle Scholar
Gilbody, S, Richards, D, Brealey, S, Hewitt, C (2007). Screening for depression in medical settings with the Patient Health Questionnaire (PHQ): a diagnostic meta-analysis. Journal of General Internal Medicine 22, 15961602.CrossRefGoogle ScholarPubMed
Gili, M, Luciano, JV, Serrano, MJ, Jimenez, R, Bauza, N, Roca, M (2011). Mental disorders among frequent attenders in primary care: a comparison with routine attenders. Journal of Nervous and Mental Disease 199, 744749.CrossRefGoogle ScholarPubMed
Green, JG, Avenevoli, S, Finkelman, M, Gruber, MJ, Kessler, RC, Merikangas, KR, Sampson, NA, Zaslavsky, AM (2011). Validation of the diagnoses of panic disorder and phobic disorders in the US National Comorbidity Survey Replication Adolescent (NCS-A) supplement. International Journal of Methods in Psychiatric Research 20, 105115.CrossRefGoogle ScholarPubMed
Groves, RM, Fowler, FJ Jr., Couper, MP, Lepkowski, JM, Singer, E, Tourangeau, R (2009). Survey Methodology, 2nd edn. Wiley: New York, NY.Google Scholar
Haynes, RB, Sackett, DL, Guyatt, GH, Tugwell, P (2006). Clinical Epidemiology: How to Do Clinical Practice Research, 3rd edn. Lippincott Williams & Wilkins: Philadelphia, PA.Google Scholar
Hirschfeld, RM, Cass, AR, Holt, DC, Carlson, CA (2005). Screening for bipolar disorder in patients treated for depression in a family medicine clinic. Journal of the American Board of Family Practice 18, 233239.CrossRefGoogle Scholar
Hirschfeld, RM, Holzer, C, Calabrese, JR, Weissman, M, Reed, M, Davies, M, Frye, MA, Keck, P, McElroy, S, Lewis, L, Tierce, J, Wagner, KD, Hazard, E (2003). Validity of the Mood Disorder Questionnaire: a general population study. American Journal of Psychiatry 160, 178180.CrossRefGoogle ScholarPubMed
Hirschfeld, RM, Vornik, LA (2004). Recognition and diagnosis of bipolar disorder. Journal of Clinical Psychiatry 65 (Suppl. 15), 59.Google ScholarPubMed
Hirschfeld, RM, Williams, JB, Spitzer, RL, Calabrese, JR, Flynn, L, Keck, Jr. PE, Lewis, L, McElroy, SL, Post, RM, Rapport, DJ, Russell, JM, Sachs, GS, Zajecka, J (2000). Development and validation of a screening instrument for bipolar spectrum disorder: the Mood Disorder Questionnaire. American Journal of Psychiatry 157, 18731875.CrossRefGoogle ScholarPubMed
Houston, JP, Kroenke, K, Faries, DE, Doebbeling, CC, Adler, LA, Ahl, J, Swindle, R, Trzepacz, PT (2011). A provisional screening instrument for four common mental disorders in adult primary care patients. Psychosomatics 52, 4855.CrossRefGoogle ScholarPubMed
Hunter, EE, Penick, EC, Powell, BJ, Othmer, E, Nickel, EJ, Desouza, C (2005). Development of scales to screen for eight common psychiatric disorders. Journal of Nervous and Mental Disease 193, 131135.CrossRefGoogle ScholarPubMed
Katz, MM, Secunda, SK, Hirschfeld, RM, Koslow, SH (1979). NIMH clinical research branch collaborative program on the psychobiology of depression. Archives of General Psychiatry 36, 765771.CrossRefGoogle ScholarPubMed
Kessler, RC, Adler, LA, Gruber, MJ, Sarawate, CA, Spencer, T, Van Brunt, DL (2007). Validity of the World Health Organization Adult ADHD Self-Report Scale (ASRS) Screener in a representative sample of health plan members. International Journal of Methods in Psychiatric Research 16, 5265.CrossRefGoogle Scholar
Kessler, RC, Akiskal, HS, Angst, J, Guyer, M, Hirschfeld, RM, Merikangas, KR, Stang, PE (2006). Validity of the assessment of bipolar spectrum disorders in the WHO CIDI 3.0. Journal of Affective Disorders 96, 259269.CrossRefGoogle ScholarPubMed
Kessler, RC, Coulouvrat, C, Hajak, G, Lakoma, MD, Roth, T, Sampson, N, Shahly, V, Shillington, A, Stephenson, JJ, Walsh, JK, Zammit, GK (2010 a). Reliability and validity of the Brief Insomnia Questionnaire in the America Insomnia Survey. Sleep 33, 15391549.CrossRefGoogle ScholarPubMed
Kessler, RC, Demler, O, Frank, RG, Olfson, M, Pincus, HA, Walters, EE, Wang, P, Wells, KB, Zaslavsky, AM (2005). Prevalence and treatment of mental disorders, 1990 to 2003. New England Journal of Medicine 352, 25152523.CrossRefGoogle ScholarPubMed
Kessler, RC, Green, JG, Gruber, MJ, Sampson, NA, Bromet, E, Cuitan, M, Furukawa, TA, Gureje, O, Hinkov, H, Hu, CY, Lara, C, Lee, S, Mneimneh, Z, Myer, L, Oakley-Browne, M, Posada-Villa, J, Sagar, R, Viana, MC, Zaslavsky, AM (2010 b). Screening for serious mental illness in the general population with the K6 screening scale: results from the WHO World Mental Health (WMH) Survey Initiative. International Journal of Methods in Psychiatric Research 19 (Suppl. 1), 422.CrossRefGoogle ScholarPubMed
Kessler, RC, Üstün, TB (2004). The World Mental Health (WMH) Survey Initiative Version of the World Health Organization (WHO) Composite International Diagnostic Interview (CIDI). International Journal of Methods in Psychiatric Research 13, 93121.CrossRefGoogle ScholarPubMed
Kessler, RC, Üstün, TB (2008 a). Overview and future directions for the World Mental Health Survey Initiative. In The WHO World Mental Health Surveys: Global Perspectives on the Epidemiology of Mental Disorders (ed. Kessler, R. C. and Üstün, T. B.), pp. 555568. Cambridge University Press: New York, NY.Google Scholar
Kessler, RC, Üstün, TB (eds) (2008 b). The WHO World Mental Health Surveys: Global Perspectives on the Epidemiology of Mental Disorders. Cambridge University Press: New York, NY.Google Scholar
Kessler, RC, Wittchen, H-U, Abelson, JM, McGonagle, KA, Schwarz, N, Kendler, KS, Knäuper, B, Zhao, S (1998). Methodological studies of the Composite International Diagnostic Interview (CIDI) in the US National Comorbidity Survey. International Journal of Methods in Psychiatric Research 7, 3355.CrossRefGoogle Scholar
Kisely, S, Scott, A, Denney, J, Simon, G (2006). Duration of untreated symptoms in common mental disorders: association with outcomes: international study. British Journal of Psychiatry 189, 7980.CrossRefGoogle ScholarPubMed
Kisely, S, Simon, G (2005). An international study of the effect of physical ill health on psychiatric recovery in primary care. Psychosomatic Medicine 67, 116122.CrossRefGoogle Scholar
Klinkman, MS, Coyne, JC, Gallo, S, Schwenk, TL (1997). Can case-finding instruments be used to improve physician detection of depression in primary care? Archives of Family Medicine 6, 567573.CrossRefGoogle ScholarPubMed
Konnopka, A, Leichsenring, F, Leibing, E, Konig, HH (2009). Cost-of-illness studies and cost-effectiveness analyses in anxiety disorders: a systematic review. Journal of Affective Disorders 114, 1431.CrossRefGoogle ScholarPubMed
Kraemer, HC (1992). Evaluating Medical Tests: Objective and Quantitative Guidelines. Sage: Newbury Park, CA.Google Scholar
Kroenke, K, Spitzer, RL, Williams, JB, Lowe, B (2010). The Patient Health Questionnaire Somatic, Anxiety, and Depressive Symptom Scales: a systematic review. General Hospital Psychiatry 32, 345359.CrossRefGoogle ScholarPubMed
Kroenke, K, Spitzer, RL, Williams, JB, Monahan, PO, Lowe, B (2007). Anxiety disorders in primary care: prevalence, impairment, comorbidity, and detection. Annals of Internal Medicine 146, 317325.CrossRefGoogle ScholarPubMed
Landis, JR, Koch, GG (1977). The measurement of observer agreement for categorical data. Biometrics 33, 159174.CrossRefGoogle ScholarPubMed
Lowe, B, Grafe, K, Zipfel, S, Spitzer, RL, Herrmann-Lingen, C, Witte, S, Herzog, W (2003). Detecting panic disorder in medical and psychosomatic outpatients: comparative validation of the Hospital Anxiety and Depression Scale, the Patient Health Questionnaire, a screening question, and physicians' diagnosis. Journal of Psychosomatic Research 55, 515519.CrossRefGoogle ScholarPubMed
Lowe, B, Spitzer, RL, Williams, JB, Mussell, M, Schellberg, D, Kroenke, K (2008). Depression, anxiety and somatization in primary care: syndrome overlap and functional impairment. General Hospital Psychiatry 30, 191199.CrossRefGoogle ScholarPubMed
Manea, L, Gilbody, S, McMillan, D (2012). Optimal cut-off score for diagnosing depression with the Patient Health Questionnaire (PHQ-9): a meta-analysis. Canadian Medical Association Journal 184, E191E196.CrossRefGoogle ScholarPubMed
Margolis, DJ, Bilker, W, Boston, R, Localio, R, Berlin, JA (2002). Statistical characteristics of area under the receiver operating characteristic curve for a simple prognostic model using traditional and bootstrapped approaches. Journal of Clinical Epidemiology 55, 518524.CrossRefGoogle ScholarPubMed
Miller, CJ, Johnson, SL, Kwapil, TR, Carver, CS (2011). Three studies on self-report scales to detect bipolar disorder. Journal of Affective Disorders 128, 199210.CrossRefGoogle ScholarPubMed
Miller, CJ, Klugman, J, Berv, DA, Rosenquist, KJ, Ghaemi, SN (2004). Sensitivity and specificity of the Mood Disorder Questionnaire for detecting bipolar disorder. Journal of Affective Disorders 81, 167171.CrossRefGoogle ScholarPubMed
Parker, G, Fletcher, K, Barrett, M, Synnott, H, Breakspear, M, Hyett, M, Hadzi-Pavlovic, D (2008). Screening for bipolar disorder: the utility and comparative properties of the MSS and MDQ measures. Journal of Affective Disorders 109, 8389.CrossRefGoogle ScholarPubMed
Parker, G, Graham, R, Hadzi-Pavlovic, D, Fletcher, K, Hong, M, Futeran, S (2012). Further examination of the utility and comparative properties of the MSQ and MDQ bipolar screening measures. Journal of Affective Disorders 138, 104109.CrossRefGoogle ScholarPubMed
Parker, G, Hadzi-Pavlovic, D, Tully, L (2006). Distinguishing bipolar and unipolar disorders: an isomer model. Journal of Affective Disorders 96, 6773.CrossRefGoogle ScholarPubMed
Pepe, MS (2003). Statistical Analysis of Medical Tests for Classification and Prediction. Oxford University Press: New York, NY.CrossRefGoogle Scholar
Presser, S, Blair, J (1994). Survey pretesting: do different methods yield different results? Sociological Methodology 24, 73104.CrossRefGoogle Scholar
Presser, S, Couper, MP, Lessler, JT, Martin, E, Martin, J, Rothgeb, JM, Singer, E (2004). Methods for testing and evaluating survey questions. Public Opinion Quarterly 68, 109130.CrossRefGoogle Scholar
Radloff, LS (1977). The CES-D Scale: a self-report depression scale for research in the general population. Applied Psychological Measurement 1, 385401.CrossRefGoogle Scholar
Robins, LN, Wing, J, Wittchen, HU, Helzer, JE, Babor, TF, Burke, J, Farmer, A, Jablenski, A, Pickens, R, Regier, DA, Sartorius, N, Towle, L (1988). The Composite International Diagnostic Interview. An epidemiologic instrument suitable for use in conjunction with different diagnostic systems and in different cultures. Archives of General Psychiatry 45, 10691077.CrossRefGoogle ScholarPubMed
Ruscio, AM, Lane, M, Roy-Byrne, P, Stang, PE, Stein, DJ, Wittchen, HU, Kessler, RC (2005). Should excessive worry be required for a diagnosis of generalized anxiety disorder? Results from the US National Comorbidity Survey Replication. Psychological Medicine 35, 17611772.CrossRefGoogle ScholarPubMed
Schulberg, HC, Saul, M, McClelland, M, Ganguli, M, Christy, W, Frank, R (1985). Assessing depression in primary medical and psychiatric practices. Archives of General Psychiatry 42, 11641170.CrossRefGoogle ScholarPubMed
Spitzer, RL, Kroenke, K, Williams, JB (1999). Validation and utility of a self-report version of PRIME-MD: the PHQ primary care study. Primary Care Evaluation of Mental Disorders. Patient Health Questionnaire. Journal of the American Medical Association 282, 17371744.CrossRefGoogle ScholarPubMed
Stein, MB, Roy-Byrne, PP, McQuaid, JR, Laffaye, C, Russo, J, McCahill, ME, Katon, W, Craske, M, Bystritsky, A, Sherbourne, CD (1999). Development of a brief diagnostic screen for panic disorder in primary care. Psychosomatic Medicine 61, 359364.CrossRefGoogle ScholarPubMed
Susser, E, Schwartz, S, Morabia, A, Bromet, EJ (2006). Psychiatric Epidemiology: Searching for the Causes of Mental Disorders. Oxford Universiy Press: New York, NY.CrossRefGoogle Scholar
Thomas, JL, Jones, GN, Scarinci, IC, Mehan, DJ, Brantley, PJ (2001). The utility of the CES-D as a depression screening measure among low-income women attending primary care clinics. The Center for Epidemiologic Studies-Depression. International Journal of Psychiatry in Medicine 31, 2540.CrossRefGoogle ScholarPubMed
Tsuang, MT, Tohen, M, Jones, P (eds) (2011). Textbook of Psychiatric Epidemiology. Wiley: New York, NY.CrossRefGoogle Scholar
Twiss, J, Jones, S, Anderson, I (2008). Validation of the Mood Disorder Questionnaire for screening for bipolar disorder in a UK sample. Journal of Affective Disorders 110, 180184.CrossRefGoogle Scholar
Üstün, TB, Sartorius, N (eds) (1995). Mental Illness in General Health Care: An International Study. Wiley: New York, NY.Google Scholar
Weber Rouget, B, Gervasoni, N, Dubuis, V, Gex-Fabry, M, Bondolfi, G, Aubry, JM (2005). Screening for bipolar disorders using a French version of the Mood Disorder Questionnaire (MDQ). Journal of Affective Disorders 88, 103108.CrossRefGoogle ScholarPubMed
Willis, GB (2005). Cognitive Interviewing: A Tool for Improving Questionnaire Design. Sage: Thousand Oaks, CA.CrossRefGoogle Scholar
Wittchen, HU (1994). Reliability and validity studies of the WHO-Composite International Diagnostic Interview (CIDI): a critical review. Journal of Psychiatric Research 28, 5784.CrossRefGoogle ScholarPubMed
Wittchen, HU, Kessler, RC, Beesdo, K, Krause, P, Hofler, M, Hoyer, J (2002). Generalized anxiety and depression in primary care: prevalence, recognition, and management. Journal of Clinical Psychiatry 63 (Suppl. 8), 2434.Google ScholarPubMed
Wittchen, HU, Kessler, RC, Zhao, S, Abelson, J (1995). Reliability and clinical validity of UM-CIDI DSM-III-R generalized anxiety disorder. Journal of Psychiatric Research 29, 95110.CrossRefGoogle ScholarPubMed
Wittkampf, KA, Naeije, L, Schene, AH, Huyser, J, van Weert, HC (2007). Diagnostic accuracy of the mood module of the Patient Health Questionnaire: a systematic review. General Hospital Psychiatry 29, 388395.CrossRefGoogle ScholarPubMed
Wolter, KM (1985). Introduction to Variance Estimation. Springer-Verlag: New York, NY.Google Scholar
Zigmond, AS, Snaith, RP (1983). The hospital anxiety and depression scale. Acta Psychiatrica Scandinavica 67, 361370.CrossRefGoogle ScholarPubMed
Zimmerman, M, Galione, JN, Ruggero, CJ, Chelminski, I, McGlinchey, JB, Dalrymple, K, Young, D (2009). Performance of the mood disorders questionnaire in a psychiatric outpatient setting. Bipolar Disorders 11, 759765.CrossRefGoogle Scholar