Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSD
[Background] In the 11th revision of the International Classification of Diseases (ICD-11) posttraumatic stress disorder (PTSD) and the complex variant (CPTSD) were newly conceptualised. The International Trauma Questionnaire (ITQ) was developed as a brief self-report measure to screen for both diso...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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PsychOpen GOLD/ Leibniz Institute for Psychology
2021-12-01
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| Series: | Clinical Psychology in Europe |
| Subjects: | |
| Online Access: | https://cpe.psychopen.eu/index.php/cpe/article/view/5501 |
| _version_ | 1797972435778142208 |
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| author | Daniel Christen Clare Killikelly Andreas Maercker Mareike Augsburger |
| author_facet | Daniel Christen Clare Killikelly Andreas Maercker Mareike Augsburger |
| author_sort | Daniel Christen |
| collection | DOAJ |
| description | [Background] In the 11th revision of the International Classification of Diseases (ICD-11) posttraumatic stress disorder (PTSD) and the complex variant (CPTSD) were newly conceptualised. The International Trauma Questionnaire (ITQ) was developed as a brief self-report measure to screen for both disorders. The English original version has been rigorously tested and presents convincing psychometric properties. The aim of the current study was to validate the German version by means of item response theory (IRT). [Method] This is a secondary analysis of a representative, trauma-exposed adult sample from the German general population (N = 500). 1- and 2-parameter logistic IRT models (i.e. examination on an item level), diagnostic rates and confirmatory factor analyses were calculated. [Results] All items showed good model fit and acceptable to good performance aligning with the items of the English original except for item C1 (Long time to calm down) which had a high endorsement rate and a low discriminatory power yielding low information gain. CPTSD diagnostic rate of 3.2% was lower than in comparable literature. Confirmatory factor analysis deemed the six first-order, two second-order factors model superior. [Conclusion] Measurement and factorial validity of the German version of the ITQ was confirmed. The German translation matches the English original in most psychometric properties and can thus be used for research and clinical practice. |
| first_indexed | 2024-04-11T03:48:23Z |
| format | Article |
| id | doaj.art-2c274a1584834aa0b96468ce01b2e4a4 |
| institution | Directory Open Access Journal |
| issn | 2625-3410 |
| language | English |
| last_indexed | 2024-04-11T03:48:23Z |
| publishDate | 2021-12-01 |
| publisher | PsychOpen GOLD/ Leibniz Institute for Psychology |
| record_format | Article |
| series | Clinical Psychology in Europe |
| spelling | doaj.art-2c274a1584834aa0b96468ce01b2e4a42023-01-02T02:18:47ZengPsychOpen GOLD/ Leibniz Institute for PsychologyClinical Psychology in Europe2625-34102021-12-013410.32872/cpe.5501cpe.5501Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSDDaniel Christen0Clare Killikelly1https://orcid.org/0000-0003-2661-4521Andreas Maercker2https://orcid.org/0000-0001-6925-3266Mareike Augsburger3https://orcid.org/0000-0002-6564-0717Division of Psychopathology, Department of Psychology, University of Zurich, Zurich, SwitzerlandDivision of Psychopathology, Department of Psychology, University of Zurich, Zurich, SwitzerlandDivision of Psychopathology, Department of Psychology, University of Zurich, Zurich, SwitzerlandDivision of Psychopathology, Department of Psychology, University of Zurich, Zurich, Switzerland[Background] In the 11th revision of the International Classification of Diseases (ICD-11) posttraumatic stress disorder (PTSD) and the complex variant (CPTSD) were newly conceptualised. The International Trauma Questionnaire (ITQ) was developed as a brief self-report measure to screen for both disorders. The English original version has been rigorously tested and presents convincing psychometric properties. The aim of the current study was to validate the German version by means of item response theory (IRT). [Method] This is a secondary analysis of a representative, trauma-exposed adult sample from the German general population (N = 500). 1- and 2-parameter logistic IRT models (i.e. examination on an item level), diagnostic rates and confirmatory factor analyses were calculated. [Results] All items showed good model fit and acceptable to good performance aligning with the items of the English original except for item C1 (Long time to calm down) which had a high endorsement rate and a low discriminatory power yielding low information gain. CPTSD diagnostic rate of 3.2% was lower than in comparable literature. Confirmatory factor analysis deemed the six first-order, two second-order factors model superior. [Conclusion] Measurement and factorial validity of the German version of the ITQ was confirmed. The German translation matches the English original in most psychometric properties and can thus be used for research and clinical practice.https://cpe.psychopen.eu/index.php/cpe/article/view/5501international trauma questionnaireitqicd-11validationptsdcptsditem response theorygerman translation |
| spellingShingle | Daniel Christen Clare Killikelly Andreas Maercker Mareike Augsburger Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSD Clinical Psychology in Europe international trauma questionnaire itq icd-11 validation ptsd cptsd item response theory german translation |
| title | Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSD |
| title_full | Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSD |
| title_fullStr | Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSD |
| title_full_unstemmed | Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSD |
| title_short | Item Response Model Validation of the German ICD-11 International Trauma Questionnaire for PTSD and CPTSD |
| title_sort | item response model validation of the german icd 11 international trauma questionnaire for ptsd and cptsd |
| topic | international trauma questionnaire itq icd-11 validation ptsd cptsd item response theory german translation |
| url | https://cpe.psychopen.eu/index.php/cpe/article/view/5501 |
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