Although Prolonged Grief Disorder (PGD) is a mental disorder introduced into both the Diagnostic and Statistical Manual of Mental Disorders—5—Text Revision (DSM-5-RT) and the International Classification of Diseases 11th Revision (ICD-11), the list of symptoms of this disorder in the two classifications differs slightly. In PGD research, the severity of the disorder's symptoms is usually measured using one of three scales: the Prolonged Grief Disorder-13-Revised (PG-13-R), the Prolonged Grief Disorder-13 scale (PG-13), or the Inventory of Complicated Grief. All these tools measure the severity of most of the PGD symptoms described in the ICD and DSM; however, the valid measurement of the severity of the disorder's symptoms according to both classifications using the three scales mentioned above requires further works. The starting point for these works is the presented table.
The first aim of the table is to show the extent to which the symptoms of PGD described in DSM-5-TR and ICD-11 overlap, and to show the symptoms that are included in only one of the classifications. The second aim is to show which items from PG-13, PG-13-R and ICG should be used for the most valid assessment of PGD symptom severity according to DSM and/or ICD.
The table can help you decide which PGD measurement tools to use in your research project or clinical work in order to most accurately measure the severity of the symptoms of a disorder according to a given classification (DSM or ICD). Additionally, in the case of older studies that were conducted using ICG, it will allow you to decide which ICG items should be summed up and which should be excluded from the overall ICG score in order to obtain a result that most accurately reflects the severity of PGD symptoms according to DSM or ICD. The table can also be a starting point for the development of new tools to measure the severity of PGD symptoms; although PG-13-R measures the full range of PGD symptoms according to DSM-5-TR, there is a particular need to develop methods for measuring the severity of PGD symptoms according to ICD-11.