Psychometric Evaluation of the Traumatic Grief Inventory-Self Report Plus (TGI-SR+) in Chinese Bereaved People

Objective: The Traumatic Grief Inventory-Self Report Plus (TGI-SR+) measures the most recent prolonged grief disorder (PGD) symptom sets defined in the 11^th edition of the International Statistical of Diseases and Related Health Problems (ICD-11) and the text revision of the fifth edition of the Diagnostical and Statistical Manual of Mental Disorders (DSM-5-TR). However, the TGI-SR+ has not yet been translated and validated in Chinese. This study aims to evaluate the psychometric properties of the Chinese translation of the TGI-SR+. Methods: We examined the Chinese TGI-SR+'s factor structure, internal consistency, convergent validity, discriminant validity, known-groups validity, and optimal clinical cut-off scores in 443 Chinese bereaved adults. Results: Confirmatory factor analyses showed that the two-factor models showed the best fit for the Chinese TGI-SR+ items assessing ICD-11 and DSM-5-TR prolonged grief symptoms. Items assessing ICD-11 and DSM-5-TR prolonged grief symptoms demonstrated good internal consistency. Associations of TGI-SR+ scores with symptom levels of prolonged grief (assessed by the International Prolonged Grief Disorder Scale), posttraumatic stress, anxiety, and depression supported convergent and discriminant validity. Associations with background/loss-related variables provided evidence for known-groups validity. Cut-off points for probable ICD-11 PGD (liberal scoring rule), probable ICD-11 PGD (conservative scoring rule), and probable DSM-5-TR PGD were ≥67, ≥75, and ≥68, respectively. Discussion: The Chinese TGI-SR+ appears to be a reliable and valid measure to assess prolonged grief symptoms per ICD-11 and DSM-5-TR among Chinese bereaved adults.