Psychometric evaluation of the Clinical Outcome in Routine Evaluation – General Population: Czech version
Keywords:GP-CORE, Clinical Outcome in Routine Evaluation – General Population, psychological distress, factor structure, MIRT
Objectives. This study aimed to assess psychometric properties, such as reliability, construct validity, and cut-off scores, for the Czech version of the Clinical Outcome in Routine Evaluation – General Population (GP-CORE) questionnaire, a tool usable for repeated measurement of psychological distress within routine clinical settings.
Participants and setting. Two general populations and one clinical sample were used with N values of 420, 394, and 345, respectively.
Hypotheses. One of the competing theoretical factor solutions will demonstrate the best fit.
Statistical analysis. To examine the factor structure of the GP-CORE, a confirmatory multidimensional item response theory analysis (graded response model) was employed.
Results. The best fitting model was a bifactor solution representing one content domain of overall distress and two item wording domains (positively and negatively worded items). Clinical cut-off scores were determined to be 1.85 (men) and 1.90 (women).
Study limitations. The GP-CORE can be used as an unidimensional measure of overall distress, but users have to be aware of the influence of positive vs. negative item wording on the responses.
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Copyright (c) 2021 Adam Klocek, Tomáš Řiháček, Hynek Cígler
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