Same name, same content? Evaluation of DSM-5-TR and ICD-11 prolonged grief criteria

Investigating the concordance of prolonged grief disorder (PGD) criteria that have been recently introduced to the 5th text revision of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5-TR) and the International Classification of Diseases 11th Revision (ICD-11).

N = 193 treatment-seeking bereaved adults were assessed with the prolonged grief disorder 13 + 9 interview. Data were examined in terms of (a) diagnostic rates for PGDDSM-5-TR and PGDICD-11, including increases of the PGDICD-11 accessory symptom threshold (PGDICD-11-X+) and time criterion (PGDICD-11-12 months), (b) dimensionality, (c) the frequency with which single PGD symptoms occur, and (d) concurrent validity in terms of psychological symptoms and loss-related characteristics.

The diagnostic rate of PGDDSM-5-TR (52%) was significantly lower than that of PGDICD-11 (76%) and agreement between the two criteria sets was moderate, κ = 0.51, 95% CI [0.47-0.55]. Increasing the PGDICD-11 accessory symptom threshold did not improve the diagnostic agreement. In contrast, increasing the ICD-11 time criterion led to almost perfect agreement between PGDICD-11-12 months and PGDDSM-5-TR, κ = 0.91, 95% CI [0.89-0.93]. Confirmatory factor analysis results indicated a one-factor model fit best for both PGDDSM-5-TR and PGDICD-11. Emotional pain symptoms (e.g., guilt) were predominantly reported by patients with a PGDICD-11 diagnosis, while attachment disturbance symptoms (e.g., identity disruption) were reported more often by patients with a PGDDSM-5-TR diagnosis.

Despite methodological limitations of this study, results indicate discordance in PGDDSM-5-TR and PGDICD-11 regarding diagnostic rates and single symptom occurrence, while the factor structure is similar. Changes in the ICD-11 time criterion could reduce these differences. (PsycInfo Database Record (c) 2022 APA, all rights reserved).