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[Reliability and construct validity of the OPD-CA axes: structure and prerequisites for treatment]
Rainer Fliedl1, Petra Katzenschläger2
1Institut für Psychosoziale Medizin, Psychotherapie und Kindheitsforschung, LK Baden-Mödling, Abteilung für Kinder- und Jugendpsychiatrie und Psychotherapie Hinterbrühl, Karl Landsteiner Gesellschaft, Fürstenweg 8, 2371, Hinterbrühl, Österreich. rainer.fliedl@moedling.lknoe.at.
Background:
The aim of this study was to compare the Operationalized Psychodynamic Diagnostics (OPD-CA) for children and adolescents with the modified version (OPD-CA-2) focusing on the mainly unchanged treatment conditions and the redesigned structure axis.
Methods:
The patient sample consisted 371 inpatient children and adolescents with psychiatric disorders from 3 to 18 years. OPD-CA and OPD-CA-2 diagnostics were routinely performed by OPD-experienced raters. Statistical calculation included Cronbach's alpha (internal consistency) and confirmatory factor analysis.
Results:
The OPD-CA-2 structure axis showed very good internal consistency (reliability) compared to the OPD-CA. We found satisfactorily good values for the treatment conditions with slightly higher average scores in the OPD-CA-2. Confirmatory factor analysis resulted in two models where the items on the OPD-CA-2 structure axis were stronger correlated than those of the OPD-CA.
Conclusion:
The OPD-CA-2 is a reliable and valid instrument for assessing treatment conditions and psychic structure in children and adolescents. The reorganization of the structure axis and the treatment conditions in the OPD-CA-2 resulted in a measurable improvement.
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