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Competing Interests: Declaration of competing interest All authors declare that there are no conflicts of interest in relation to the submitted paper.

Background: Prolonged grief disorder (PGD), included in the ICD-11, encompasses a six-month duration criterion, but whether this covers 'time since loss' or 'grief persistency' is unclear. The study estimated prevalence and predictors of probable ICD-11 PGD using different applications of the duration criterion.Methods: A register-sampled cohort of bereaved spouses completed self-report questionnaires at two (T1, N=847), six (T2, N=777), and eleven months (T3, N=753) post-loss. The duration criterion was operationalized as single-point PGD (meeting criteria minimally six months post-loss; T2 or T3) and dual-point PGD (meeting criteria at two assessments separated by months; T1+T2 or T2+T3).Results: Single-point PGD prevalence rates (~15-20%) were significantly higher than dual-point prevalence rates (~10%). While single assessments of PGD varied between T2 and T3, the dual-point prevalence rates did not significantly differ. Early probable grief caseness emerged as the strongest predictor for later PGD.Limitations: Without a structured clinical interview, only probable cases of PGD were identified. Caseness relied on a diagnostic algorithm, created by mapping items from different self-report questionnaires. Time frames between assessments did not cover an entire six-month period.Conclusions: Momentarily assessed, six-month PGD symptomatology may represent a fluctuating, but remitting grief process for some individuals. Further research could test whether multiple diagnostic indicators during the first year of bereavement improve the identification of genuinely prolonged grief reactions. [ABSTRACT FROM AUTHOR]

Background: Prolonged grief disorder (PGD) is a bereavement-specific syndrome expected to be included in the forthcoming ICD-11. Defining the prevalence of PGD will have important nosological, clinical, and therapeutic implications. The present systematic review and meta-analysis aimed to estimate the prevalence rate of PGD in the adult bereaved population, identify possible moderators, and explore methodological quality of studies in this area.Methods: A systematic literature search was conducted in PubMed, PsycINFO, Embase, Web of Science, and CINAHL. Studies with non-psychiatric, adult populations exposed to non-violent bereavement were included and subjected to meta-analytic evaluation.Results: Fourteen eligible studies were identified. Meta-analysis revealed a pooled prevalence of PGD of 9.8% (95% CI 6.8-14.0). Moderation analyses showed higher mean age to be associated with higher prevalence of PGD. Study quality was characterized by low risk of internal validity bias but high risk of external validity bias.Limitations: The available studies are methodologically heterogeneous. Among the limitations are that only half the studies used registry-based probability sampling methods (50.0%) and few studies analyzed non-responders (14.3%).Conclusions: This first systematic review and meta-analysis of the prevalence of PGD suggests that one out of ten bereaved adults is at risk for PGD. To allocate economic and professional resources most effectively, this result underscores the importance of identifying and offer treatment to those bereaved individuals in greatest need. Due to heterogeneity and limited representativeness, the findings should be interpreted cautiously and additional high-quality epidemiological research using population-based designs is needed. [ABSTRACT FROM AUTHOR]

Prolonged grief disorder (PGD) is now included as a diagnosis in international classification systems. Most research on PGD is based on Western populations, but first data from non-Western countries have recently become available. Little is still known about country-related effects on PGD's prevalence. Determining possible causes of variations in the prevalence of PGD as defined by DSM-5-TR and ICD-11 within and between countries. We retrieved data from 24 prevalence studies, the World Bank and the 2022 World Risk Report. Negative binomial regressions were used to explore methodological, loss-related and country context characteristics as predictors of PGD. The average rate of PGD was calculated using random effects models. The included studies comprised 34 samples from 16 countries (20,347 participants). Non-probability sampling and older mean age of the sample as well as lower country vulnerability were associated with higher PGD rates. The average PGD prevalence was 13 % (95 % CI [11, 22]), varying from 5 % (95 % CI [3, 11]) in probability to 16 % (95 % CI [13, 25]) in non-probability samples. Samples from Europe and North America were overrepresented. For about half of the countries, data were available from only one sample. While confirming the importance of studies' methodological quality, the results show that PGD is of public health relevance around the world, but especially common in less vulnerabled countries with better access to daily necessities and healthcare services, highlighting sociocultural impacts on grief processing. Further investigations of cross-national differences are needed. • This is the first investigation cross-country variations in prevalence rates of prolonged grief disorder (PGD) • On the basis of 34 samples from 16 countries, we found that PGD rates could be predicted by age, sampling approach, and country vulnerability • This shows that PGD is of relevance around the world, but seems to be more common in less vulnerable countries with good access to daily necessities and healthcare services [ABSTRACT FROM AUTHOR]

Background: A distinct grief-specific disorder is included in the ICD-11. Lack of clarity remains regarding whether different proposed diagnostic criteria capture similar or different diagnostic entities. Our aim was to examine the specificity of four proposed diagnostic criteria-sets for pathological grief in a population-based sample.Methods: Participants were 206 conjugally bereaved elderly Danes (59% female; mean age = 72.5 years, SD = 4.2; range 65-81) who completed self-report questionnaires six months post-loss. The main measure was the Danish version of Inventory of Complicated Grief-Revised.Results: Results indicate substantial agreement between Prolonged Grief Disorder (PGD), Persistent Complex Bereavement Disorder (PCBD) and ICD-11-PGD (kappa's = 0.69-0.84), which found 6-9% of cases tested positive for pathological grief. Complicated Grief (CG) was partly in agreement with the three other symptom-diagnostic tests (kappa's = 0.13-0.20), and the prevalence-rate of pathological grief was 48%.Limitations: The low response-rate of 39%. The selective inclusion of data ≥6 months post-loss prevents a comparison of acute and prolonged grief reactions. Using self-reported data, not diagnostic interviews, challenges the validity of our findings. Using a sample of elderly people may limit the generalizability of our results to other age groups.Conclusion: We suggest that PGD, PCBD and ICD-11-PGD may be more discriminative in identifying a specific grief-related psychopathology, while CG may identify a broader set of grief reactions. [ABSTRACT FROM AUTHOR]