A nationally representative survey of ICD-11 PTSD among Danish adolescents and young adults aged 15-29

Posttraumatic stress disorder (PTSD) is recognized as a debilitating psychiatric disorder affecting populations worldwide. This has inspired many countries to estimate the national prevalence rates of PTSD in Europe and beyond. At present, there are no published representative studies that have assessed the occurrence of trauma exposure and PTSD in Denmark using a valid measurement based on ICD-11 criteria. A national sample of the general population of young Danish residents, ranging in age between 15 to 29 years (n = 2,434), was surveyed cross-sectionally from April to October 2022. Data weights were applied to ensure representativity of the sample. Multiple regression was used to study the relationship between trauma exposure, sex, age, and PTSD. Accidents and violence were the most common types of trauma exposure with females being more likely to experience sexual violence. A total of 7.7% endorsed probable PTSD with women reporting higher rates of clinical and subclinical PTSD (12.3% and 12.7%, respectively) than men (3.5% and 7.3%, respectively). Findings from the multiple regression showed that female gender was associated with higher PTSD-severity, although the strongest predictor was trauma-type with other types of traumas, and sexual violence displaying the strongest relationship to PTSD-severity overall. A dose-response relationship between the number of trauma types and PTSD symptomatology was found. This is the first study of PTSD in a nationally representative Danish sample using a valid measure of ICD-11 PTSD. The identified PTSD rates were higher than Danish official estimates in a representative sample of the Danish adolescent and young adult population (7.7% weighted compared to 1%). The study replicated international findings of sex differences in probable PTSD endorsement.

Trying to Fit a Square Peg in a Round Hole? Testing the Robustness of Maltreatment Measurement Models for Youth

Research on maltreatment exposure often demonstrates mixed findings and a potential explanation for this may be the measurement of maltreatment. One approach for addressing measurement concerns, which also accounts for maltreatment's multidimensional nature, is the use of a measurement or latent model. However, there is minimal evidence on the generalizability of this approach across populations of youth. This study examined measurement invariance of a one-factor maltreatment model across two samples of youth exposed to maltreatment using case file data from the SPARK and LONGSCAN datasets (N = 1286). Results showed that only partial metric invariance could be established for the one-factor model between SPARK and LONGSCAN subsamples, and neglect and emotional abuse indicators tended to show low factor loadings. Findings highlight the need to consider how potential differences in documentation and maltreatment rates influence model performance and the need for research on which maltreatment characteristics may best capture youths' experiences.

The Prevalence, Patterns and Correlates of Childhood Trauma Exposure in a Nationally Representative Sample of Young People in Northern Ireland

PURPOSE

Childhood trauma (CT) exposure is common, with many young people affected by multiple co-occurring traumas.

METHODS

Participants were a representative sample of 11-19-year-olds (n = 1293), who participated in the largest ever representative survey of youth mental health in Northern Ireland (NI) - the NI Youth Wellbeing Prevalence Survey 2020. This study used latent class analysis (LCA) to identify typologies that were most representative of trauma experience and co-occurrence among young people living in NI. Demographic, parental and deprivation variables were then used within a multinomial logistic regression analysis to describe trauma class membership.

RESULTS

Over 35% (n = 478) of participants reported exposure to at least one CT, with over 50% (n = 259) of trauma-exposed young people reporting multiple trauma exposure. LCA results provided support for a three-class model; 'low-exposure', 'moderate-exposure: community-victimization' and 'high-exposure: sexual-trauma'. While none of the child, parental or familial covariates differentiated members of the 'moderate-exposure: community-victimization' from 'low-exposure', those in 'high-exposure: sexual-trauma' were over four and a half times more likely to belong to a family in receipt of income benefits and over ten times more likely to have experienced some form of out-of-home care.

CONCLUSIONS

This study highlights the presence of three distinct trauma classes in the NI adolescent population. In particular, this study identifies a small minority of young people who have experienced multiple CT's, including sexually based traumas, with these traumas most likely to have occurred in the context of out-of-home care and familial poverty.

The nature and extent of child maltreatment in Denmark: Using self-report and administrative data from the 1984 birth cohort

BACKGROUND

Research on child maltreatment (CM) has few longitudinal studies that combine self-report data with objective administrative data that has been collected continuously for decades.

OBJECTIVE

To give an overview of 20 studies investigating the impact of CM in a Danish representative sample.

PARTICIPANTS AND SETTING

From the full 1984 Danish birth cohort, 2980 24-years old were randomly selected. There was an oversampling of child protection cases.

METHODS

The participants were interviewed by trained interviewers and Computer Assisting Methods were used for sensitive topics. The survey data were linked to several national registers using the Civil Registry Number for a series of studies on risk factors and outcomes. Linkage with parental data enabled parental risk factors before the birth to be analysed as well as several physical, psychological, and social events during their lifetime. These factors were studied in relation to the CM classes that were identified via the survey.

RESULTS

The maltreatment classes had both several specific and shared effects pertaining to risk factors before birth, during childhood through to early adulthood. Their problems included many arenas within health, mental and social life.

CONCLUSIONS

Data linkage studies provide an opportunity to conduct research using accurate sources of information which can be used to explore risk and protective factors. The prospective nature of this combined data facilitates temporal ordering which strengthen the conclusions based on longer-term follow-up.

The Role of Trauma Type and Age in the Relation Between Trauma Exposure and Intelligence

Experiencing potentially traumatic events (PTEs) is associated with deficits in cognitive functioning for youth. Previous research has demonstrated that PTE type may influence the association between PTE experiences and intelligence, such that IQ scores may differ by the type of PTE experienced. Additionally, mixed findings in the literature suggest that these associations might differ by age. The current study examined the association between PTE type and IQ and how age may moderate this association. In a sample of youth in foster care (N = 328, M_age = 13.25), physical, psychological, and sexual abuse and family PTEs were directly associated with verbal and nonverbal IQ. Age significantly moderated the association between IQ and neglect and academic PTEs. Results suggest that broad PTE grouping methods or failing to account for both maltreatment and general PTEs in samples of youth in foster care may conceal differences in how PTEs relate to intellectual functioning.

Lifetime Traumatic Experiences and Disordered Eating among University Students: The Role of Posttraumatic Stress Symptoms

The associations between lifetime traumatic events (TEs), posttraumatic stress (PTS) symptoms, and disordered eating (DE) were studied in a sample of 614 university students (mean age 20 years). An anonymous questionnaire included 32 lifetime TEs, IES-revised measured PTS symptoms, and EAT-26 evaluated DE symptoms. Statistical analyses included Pearson correlations and structural equation models (SEM) with bootstrapping method. Findings reveal the prevalence of DE in 8.1% of participants, while 73.9% of students experienced at least one lifetime TE. 52.0% of students with DE had PTS symptoms (p < 0.0001) and 30.8% of students with lifetime TEs had PTS symptoms (p < 0.001). In SEM, direct paths from lifetime TEs to PTS symptoms (0.38, p < 0.0001) and from PTS symptoms to DE (0.40, p < 0.0001) were observed. The final SEM confirmed the mediating role of PTS symptoms in the path between some TEs (traffic accident and seriously injured) and DE among the university students. If PTS symptoms are associated with DE, then addressing PTS symptoms in the context of DE treatment may improve treatment efficacy.