The Traumatic Grief Inventory-Clinician Administered: A psychometric evaluation of a new interview for ICD-11 and DSM-5-TR prolonged grief disorder severity and probable caseness

• Published in: Journal of affective disorders Vol. 330; pp. 188 - 197
• Main Authors: Lenferink, Lonneke I.M., Franzen, Minita, ten Klooster, Peter M., Knaevelsrud, Christine, Boelen, Paul A., Heeke, Carina
• Format: Journal Article
• Language: English
• Published: Netherlands Elsevier B.V 01.06.2023
• Subjects: Adult; Assessment; Bereavement; DSM; DSM-5-TR; Grief; Humans; ICD-11; International Classification of Diseases; Prolonged grief; Prolonged Grief Disorder; Psychometrics; Reproducibility of Results; Screening; DSM-5-TR; Screening; ICD-11; Prolonged grief; Assessment; DSM
• ISSN: 0165-0327; 1573-2517
• DOI: 10.1016/j.jad.2023.03.006

There is a need for an interview-based measure to assess Prolonged Grief Disorder (PGD) included in the text revision of the fifth Diagnostic and Statistical Manual for Mental Disorder (DSM-5-TR) and 11th edition of the International Classification of Disease (ICD-11). We evaluated the psychometric properties of the Traumatic Grief Inventory-Clinician Administered (TGI-CA); a new interview measuring DSM-5-TR and ICD-11 PGD severity and probable caseness. In 211 Dutch and 222 German bereaved adults, the: (i) factor structure, (ii) internal consistency, (iii) test-retest reliability, (iv) measurement invariance across subgroups (e.g., differing in language), (v) prevalence of probable caseness, (vi) convergent validity, and (vii) known-groups validity were examined. Confirmatory factor analyses (CFAs) showed acceptable fit for the unidimensional model for DSM-5-TR and ICD-11 PGD. Omega values indicated good internal consistency. Test-retest reliability was high. Multi-group CFAs demonstrated configural and metric invariance for DSM-5-TR and ICD-11 PGD criteria for all group-comparisons; for some we found support for scalar invariance. Rates of probable caseness for DSM-5-TR PGD were lower than ICD-11 PGD. Optimal agreement in probable caseness was reached when increasing the number of accessory symptoms for ICD-11 PGD from 1+ to 3+. Convergent and known-groups validity was demonstrated for both criteria-sets. The TGI-CA was developed to assess PGD severity and probable caseness. Clinical diagnostic interviews for PGD are needed. The TGI-CA seems a reliable and valid interview for DSM-5-TR and ICD-11 PGD symptomatology. More research in larger and more diverse samples is needed to further test its psychometric properties. •The Traumatic Grief Inventory-Clinician Administered (TGI-CA) was developed.•The TGI-CA is a new measure to assess DSM-5-TR and ICD-11 prolonged grief severity.•The TGI-CA is a valid and reliable tool that can be used in research and practice.