Journal Article

Psychometric properties of the International Trauma Questionnaire (ITQ) examined in a Norwegian trauma-exposed clinical sample

Øktedalen, Tuva, Hoffart, Asle, Sele, Peter, Bækkelund, Harald

2020

Overview

The International Trauma Questionnaire (ITQ) is a self-report measure for post-traumatic stress disorder (PTSD) and complex post-traumatic stress disorder (CPTSD), corresponding to the diagnostic criteria in the International Classification of Diseases, 11th Revision (ICD-11). A 12-item version of the ITQ based on samples from English-speaking countries has been presented, and the wider generalizability to other languages needs to be examined. The current study examines the psychometric properties of scores from a longer, preliminary 22-item version of the ITQ and the current reduced 12-item version by means of generalizability theory (G-theory) and confirmatory factor analysis (CFA). The 22-item version of the ITQ was translated into Norwegian and administered to patients in two trauma treatment trials (total N = 202). A generalizability study was used to investigate the psychometric properties of scores reflecting CPTSD. G-theory was also used to investigate alternative measurement designs to optimize the sufficient number of items that provide acceptable generalizability and dependability of scores. Model fit to the theoretical factor structure was then examined by CFA, both for the 22-item version and for the 12-item version of the ITQ. The two subscales negative self-concept and relational disturbances had acceptable generalizability coefficients. We found substantial measurement error related to affective dysregulation, mainly attributable to affective hyperactivation. A latent factor structure model with two separate affective dysregulation factors: hyperactivation and deactivation, represented the data well in the 22-item version. The proposed confirmatory structure model for the 12-item short form did not converge in the CFA. This study supports the applicability of the ITQ in a non-English-speaking country and provides support for the validity of the Norwegian translation. Further research is needed to improve the psychometric properties of the affective dysregulation subscale.

• Publisher: Taylor & Francis,Taylor & Francis Ltd,Taylor & Francis Group
• Subject: Análisis Factorial Confirmatorio / CIE-11 / Clinical / complex post-traumatic stress disorder (CPTSD) / Confiabilidad / confirmatory factor analysis / Cuestionario Internacional de Trauma (ITQ) / generalizability / generalización / ICD-11 / International Trauma Questionnaire (ITQ) / Post traumatic stress disorder / post-traumatic stress disorder (PTSD) / Quantitative psychology / Questionnaires / reliability / The validity of the Norwegian translation of the International Trauma Questionnaire (ITQ) is supported. Test users are encouraged to take the particular purpose of their test use into account when choosing an appropriate format of the ITQ / Trastorno de Estrés Postraumático (TEPT) / Trastorno de Estrés Postraumático Complejo (TEPT-C) / Validez / validity / 创伤后应激障碍 (PTSD) / 可靠性 / 国际创伤问卷 (ITQ) / 复杂性创伤后应激障碍 (CPTSD) / 有效性 / 概化性 / 验证性因子分析