Do we all grieve the same? A multigroup test of the dimensional structure of prolonged grief disorder among Danish bereaved partners and children

Prolonged Grief Disorder (PGD) is a newly recognized mental disorder in ICD-11 and DSM-5-TR. Several studies using exploratory factor analysis have found a unidimensional structure of the Prolonged Grief-13 (PG-13) measure of PGD. The recently published ICD-11 proposal proposes a distinction between two clusters of symptoms: Separation distress symptoms and associated cognitive, emotional and behavioral symptoms. The aim of the current study is to test competing factor structures of PGD in Danish samples of bereaved. Confirmatory factor analysis was used to test competing models of PGD among two samples of in total 1093 adults that completed the questionnaires 6 months post loss of either a parent or a partner. Convergent and divergent validity was tested via the relationship to depression, anxiety, post-traumatic stress disorder (PTSD) and general wellbeing using regression analysis. The Danish version of the PG 13 appeared to be both valid and reliable. A two-factor model reflecting the division of core- and associated symptoms of prolonged grief disorder provided the best description of the PG-13 among Danish bereaved adults and there was evidence of partial structural invariance of the latent structure of PGD across bereavement types. Convergent and divergent validity analysis supported the validity of the two-factor model of PGD. : A latent variable model differing between core- and associated symptomatology of grief is supported. The Danish translation of PG-13 is a valid measure of prolonged grief symptomatology.