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The clinical psychological diagnostic system (KPD‐38): Sensitivity to change and validity of a self‐report instrument for outcome monitoring and quality assurance
Author(s) -
Moessner Markus,
Gallas Christine,
Haug Severin,
Kordy Hand
Publication year - 2010
Publication title -
clinical psychology and psychotherapy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.315
H-Index - 76
eISSN - 1099-0879
pISSN - 1063-3995
DOI - 10.1002/cpp.717
Subject(s) - concordance , psychology , external validity , concurrent validity , scale (ratio) , psychological distress , quality assurance , criterion validity , clinical psychology , psychometrics , medicine , construct validity , psychiatry , social psychology , mental health , pathology , internal consistency , physics , quantum mechanics , external quality assessment
Background: Monitoring psychotherapeutic progress requires valid and economic measures to detect change of clinical relevance. We addressed validity and sensitivity to change of the ‘Klinisch Psychologisches Diagnosesystem 38’ (KPD‐38, Clinical Psychological Diagnosis System), an instrument for outcome monitoring and quality assurance. Methods: Data from an inpatient sample ( n = 1.377) were used to investigate the concurrent validity, the sensitivity to change, and the criterion validity of the KPD‐38 in comparison to the Outcome Questionnaire (OQ‐45) and the Brief Symptom Inventory (BSI). Results: Sensitivity‐specificity analyses showed similar sensitivity and higher specificity for the KPD‐38 scales compared with the BSI and OQ total scores. Change rates on the KPD‐38 distress scale (DIS) were found to be lower than on the BSI (KPD‐38 DIS: 36.6%, GSI: 67.7%) and the OQ‐45 (KPD‐38 DIS: 44.3%, OQ tot: 57.1%) total scores. Concordance was low with the BSI ([κ = 0.24] and moderate with the OQ‐45 [κ = 0.45]). Discussion: Implications for applications in the field of outcome assessment and the challenge of further validation are discussed. The relation between sensitivity to change and criterion validity is highlighted. Copyright © 2010 John Wiley & Sons, Ltd. Key Practitioner Messages: • The KPD‐38 is a self‐report questionnaire for outcome monitoring and quality assurance, which is free of charge for research purposes. • Both OQ‐45 and BSI show higher sensitivity to change than the KPD‐38, overall concordance of change is moderate. • Aspects of validity should be considered in the evaluation of sensitivity to change.