Diagnostik der PTBS im Spannungsfeld von DSM-5 und ICD-11

The German PCL-5: evaluating structural validity in a large-scale sample of the general German population

Background: In attempts to elucidate PTSD, recent factor analytic studies resulted in complex models with a proliferating number of factors that lack psychometrical and clinical utility. Recently, suggestions have been made to optimize factor analytic practices to meet a refined set of statistical and psychometric criteria.Objective: This study aims to assess the factorial structure of the German version of the PCL-5, implementing recent methodological advancements to address the risk of overfitting models. In doing so we diverge from traditional factor analytical research on PTSD.Method: On a large-scale sample of the German general population (n = 1625), exploratory factor analyses were run to investigate the dimensionality found within the data. Subsequently, we validated and compared all model suggestions from our preliminary analyses plus all standard and common alternative PTSD factor models (including the ICD-11 model) from previous literature with confirmatory factor analyses. We not only consider model fit indices based on WLSMV estimation but also deploy criteria such as favouring less complex models with a parsimonious number of factors, sufficient items per factor, low inter-factor correlations and number of model misspecifications.Results: All tested models showed adequate to excellent fit in respect to traditional model fit indices; however, models with two or more factors increasingly failed to meet other statistical and psychometric criteria.Conclusion: Based on the results we favour a two-factor bifactor model with a strong general PTSD factor and two less dominant specific factors - one factor with trauma-related symptoms (re-experiencing and avoidance) and one factor with global psychological symptoms (describing the trauma's higher-order impact on mood, cognition, behaviour and arousal).From the perspective of clinical utility, we recommend the cut-off scoring method for the German version of the PCL-5. Basic psychometric properties and scale characteristics are provided.

A Latent Class Analysis on Symptoms of Prolonged Grief, Post-Traumatic Stress, and Depression Following the Loss of a Loved One

BACKGROUND

The loss of a significant other can lead to variety of responses, including prolonged grief disorder (PGD), posttraumatic stress disorder (PTSD), and depression. The aim of this study was to replicate and extend previous research that indicated that three subgroups of bereaved individuals can be distinguished based one similar post-loss symptom profiles using latent class analysis (LCA). The second aim was to examine whether sociodemographic and loss-related characteristics as well as the extent of meaning making were related to classes with more pervasive psychopathology.

METHODS

Telephone-based interviews with 433 Dutch and German speaking persons who had lost a significant other at last 6 months earlier were conducted. Self-rated PGD, PTSD, and depression symptoms were assessed. LCA was conducted and correlates of class-membership were examined using the 3step approach.

RESULTS

The LCA resulted in three distinct classes: a no symptoms class (47%), a moderate PGD, low depression/PTSD class (32%), and a high PGD, moderate depression/PTSD class (21%). A multivariate analysis indicated that female gender, a shorter time since loss, an unexpected loss and less meaning made to a loss were significantly associated with membership to the moderate PGD, low depression/PTSD and high PGD, moderate depression/PTSD class compared to membership to the no symptom class. Losing a child or spouse, a shorter time since loss, and having made less meaning to the loss further distinguished between the high PGD, moderate depression/PTSD symptom class and the moderate PGD, low depression/PTSD class.

DISCUSSION

We found that the majority of individuals coped well in response to their loss since the no symptom class was the largest class. Post-loss symptoms could be categorized into classes marked by different intensity of symptoms, rather than qualitatively different symptom patterns. The findings indicate that perceiving the loss as more unexpected, finding less meaning in the loss, and loss-related factors, such as the recentness of a loss and the loss of a partner or child, were related to class membership more consistently than sociodemographic factors.

Same same but different? DSM-5 versus ICD-11 PTSD among traumatized refugees in Germany

OBJECTIVE

The recent changes in diagnostic criteria for posttraumatic stress disorder (PTSD) in the 5th edition of the DSM and the 11th edition of the ICD marked a shift towards two perspectives on the same disorder. Previous studies indicate lower prevalence rates for the ICD-11-model as compared to the DSM-5 model. Main purpose of this study is to examine the concordance between ICD-11 and DSM-5 PTSD rates, and to assess the overlap of the two PTSD definitions with anxiety and depression among refugees.

METHODS

167 traumatized refugees were assessed with the PCL-5 for the DSM-5 PTSD model. A subset of the items was used as criteria for the ICD-11 model. Depression and anxiety were measured with the HSCL-25.

RESULTS

The DSM-5-algorithm for PTSD identified significantly more cases (n = 147; 88%) than the ICD-11 algorithm (80%; n = 134). Level of agreement between the diagnostic systems was substantial (Κ = 0.67, p < .001) and 9% (n = 15) met criteria under one diagnostic system only. Overlap with depression and anxiety was high under both diagnostic systems.

CONCLUSION

PTSD rates indicated a highly distressed sample of survivors of war and trauma. Our data provide further evidence that the DSM-5 diagnoses a larger number of persons than the ICD-11. Although the level of agreement was substantial, the observed discrepancies represent a challenge for research and practice to reliably identify individuals with PTSD. Especially for refugees, this might affect their access to mental health care and appropriate treatment during an asylum procedure.