Mark Shevlin

Ulster University · School of Psychology

Whether complex posttraumatic stress disorder (CPTSD) and borderline personality disorder (BPD) diagnoses differ substantially enough to warrant separate diagnostic classifications has been a subject of controversy for years. To contribute to the nomological network of cumulative evidence, the main goal of the present study was to explore, using ne...

Unlabelled: Exposure to prolonged and/or multiple types of psychological trauma and stressors has been shown to be more strongly associated with ICD-11 complex posttraumatic stress disorder (CPTSD) than posttraumatic stress disorder (PTSD). Lesbian, gay, bisexual, trans- and queer adults (LGBTQ+) are at a heightened risk of exposure to traumatic e...

Background: High rates of posttraumatic stress disorder (PTSD) have been documented in war-affected populations. The prevalence of Complex PTSD (CPTSD) has never been assessed in an active war zone. Here, we provide initial data on war-related experiences, and prevalence rates of ICD-11 PTSD and CPTSD in a large sample of adults in Ukraine during...

This paper has now been accepted for publication for the Journal of Personality Disorders

Introduction: Loneliness is linked to negative physical and mental health outcomes. Therefore, it is important to employ reliable and valid screening measures for early detection and treatment. A widely used scale for assessing loneliness is the shortened six-item Jong Gierveld Loneliness Scale (DJGLS-6). Aims: To review and evaluate the factor str...

Background: The 11th revision of the International Classification of Diseases (ICD-11) includes a new diagnosis of complex posttraumatic stress disorder (CPTSD). The International Trauma Interview (ITI) is a novel clinician-administered diagnostic interview for the assessment of ICD-11 PTSD and CPTSD. Objective: The aim of this study was to evalua...

A nationwide survey of 2,004 adult Ukrainian parents who reported on their experiences of the war, how their own mental health has changed since the invasion in February 2022, and how the mental health of their children has changed. These data were collected between July and September 2022.

Objectives: Despite growing emphasis on the benefits of physical activity for promoting mental health, inclusion of muscle-strengthening (MS) (e.g., body-weight exercises, resistance machines) activities is limited. Notably, few studies collectively assess MS behavioural frequency, duration, and intensity. To address the gap, the current study exa...

Emerging research evidence suggests that benevolent childhood experiences (BCEs) may partly explain more favourable mental health outcomes among individuals affected by adverse childhood experiences (ACEs). However, much of this research has focused on adult populations. Consequently, this study sought to provide the first rigorous assessment of th...

Background: It is expected that the ongoing war in Ukraine will have a considerable negative impact on the mental health of the country’s population. This study aims to provide a preliminary estimate of the degree of change in the mental health problems of Ukrainian children following Russia’s invasion of Ukraine in February 2022, and identify the...

Background Developmental Trauma Disorder (DTD) is a proposed childhood psychiatric diagnosis for psychopathological and developmental sequela of victimization and attachment trauma extending beyond posttraumatic stress disorder (PTSD). Objective To determine whether a sub-group of trauma-impacted children is characterized by symptoms of DTD that e...

Commonly identified trajectories of psychological distress in response to adverse events, like the COVID-19 pandemic, include Resilience, Delayed distress, Recovery and Sustained distress. The current study aimed to analyse these four distinct response patterns during the pandemic using network analysis. Anxiety and depression symptom data collecte...

Paranoia and conspiracy are terms typically used interchangeably. However, although the underlying content of these types of beliefs might be similar (e.g., seeing others as powerful and threatening), recent research suggests that these constructs differ in important ways. One important feature shared by both constructs is excessive mistrust but th...

Objectives: Early maladaptive schemas (EMS) can result from adverse interpersonal traumatic experiences. The ICD-11 updated the concept of disorders following traumatic experiences with the new disorder of complex post-traumatic stress disorder (CPTSD). There is now a need to develop and test interventions for CPTSD. An essential step in identifyi...

Objectives: Established in March 2020, the C19PRC Study monitors the psychological and socio-economic impact of the pandemic in the UK and other countries. This paper describes the protocol for Wave 6 (August-September 2021). Methods: The survey assessed: COVID-19 related experiences; experiences of common mental health disorders; psychological...

Background: The new International Classification of Diseases came into effect in 2022 (ICD-11; World Health Organization, 2022) and included updated descriptions and diagnostic rules for "Depressive Episode" and "Generalized Anxiety Disorder." No self-report measures align with these disorders so this study reports the development and initial vali...

Background: There is currently limited information on how Russia’s war on Ukraine has affected the mental health of people living in Ukraine. Understanding the mental health effects of the war, and identifying who has been worst affected, is critical to informing mental health responses. A nationwide sample of parents in Ukraine were surveyed to (1...

Background: High rates of posttraumatic stress disorder (PTSD) have been documented in war-affected populations. The prevalence of CPTSD has never been assessed in an active war zone. Here, we provide initial data on war-related experiences, and estimated prevalence rates of ICD-11 PTSD and Complex PTSD (CPTSD) in the general adult population of Uk...

Objectives: Eating disorders (ED) are associated with significant morbidity and mortality rates and are most common in young people aged between 15 and 19 years. Large representative surveys on disordered eating in youth are lacking. The main aims were to estimate the prevalence of disordered eating in a representative sample of 11-19 year olds in...

Risk factors for psychological distress among help-seeking youth are poorly understood. Addressing this gap is important for informing mental health service provision. This study aimed to identify risk factors among youth attending Jigsaw, a youth mental health service in Ireland. Routine data were collected from N = 9,673 youth who engaged with Ji...

Objectives This study examined the association between perceived manageability of debt and risk of depression, anxiety, and mental health help-seeking among a nationally representative sample of adults living in the United Kingdom (UK). Methods Data was derived from the COVID-19 Psychological Research Consortium (C19PRC) Study Wave 6 (August/Septe...

Loneliness is a pervasive global health concern and a plethora of studies have linked it to high mortality and morbidity and psychological problems, such as depression, suicidal ideation, and anxiety. Furthermore, growing evidence suggests that loneliness is a bi-dimensional construct made up of two related but distinct categories; social and emoti...

Background: Understanding how pandemics differentially impact on the socio-protective and psychological outcomes of males and females is important to develop more equitable public health policies. We assessed whether males and females differed on measures of major depression and generalized anxiety during the COVID-19 the pandemic, and if so, whic...

Sports officials (e.g., referees, umpires, judges) can experience distress from a multitude of sources, including episodes of verbal and physical abuse from spectators, coaches, and athletes. Little is known about the impact of this abuse on mental health (MH) outcomes and intentions to quit, however. As such, the primary aims of this study were to...

Although the COVID-19 pandemic has impacted the psychological wellbeing of some people, there is evidence that many have been much less affected. The Ecological Model of Resilience (EMR) may explain why some individuals are not resilient whilst others are. In this study we test the EMR in a comparison of UK survey data collected from the Covid-19 P...

Background The International Trauma Questionnaire—Child and Adolescent version (ITQ-CA) is a self-report measure that assesses posttraumatic stress disorder (PTSD) and complex PTSD (CPTSD) based on the diagnostic formulation of the 11th version of the International Classification of Diseases (ICD-11). This study aimed to provide a Chinese translati...

Background Research into the effects of nutrition on depression is often performed by examining the effects of singular nutrients and dietary styles (e.g.: vegan, Mediterranean). The present study is the first one to establish the effects of patterns of nutritional deficiency within the American population and examines their effects on depression....

Background: International Classification of Diseases, 11th revision (ICD-11) adjustment disorder (AjD) is characterized by two main symptom clusters: preoccupation with the stressor and failure to adapt to the stressor. The network analytic approach provides important information on the structural validity of a disorder and reveals which symptoms...

Objectives: Dementia caregiver burden is a significant public health concern, affecting both the wellbeing of caregivers and their care-recipients. This study investigated a range of variables associated with caregiver burden in a large sample of UK dementia caregivers. Clinical characteristics and novel psychological constructs were used - includ...

Adverse childhood experiences (ACEs) have been repeatedly associated with a wide range of physical and mental health issues. Research has indicated high levels of anxiety and depression among university students, and a few studies have documented the relationship between ACEs and anxiety in the university student population. This study surveyed fir...

Background Adverse childhood experiences (ACEs) have various deleterious effects on mental health but few studies have been conducted in Ireland. Objective The primary objective was to determine if there were significant differences in occurrences of ACEs in U.S. and Irish adults. We also sought to determine if there were unique associations betwe...

Aims Current information about the prevalence of various mental health disorders in the general adult population of the Republic of Ireland is lacking. In this study, we examined the prevalence of 12 common mental disorders, the proportion of adults who screened positive for any disorder, the sociodemographic factors associated with meeting criteri...

Secondary traumatization (ST) is a topical area among trauma‐exposed employees, where many are at risk of occupational mental health problems due to their work with trauma survivors. Challenges related to the accurate operationalization of ST symptoms persist, and there is no valid method for identifying employees at risk of clinically significant...

There is a burgeoning evidence base highlighting the positive influence of benevolent childhood experiences (BCEs), even in the context of adversity. However, few measures are available to assess BCEs. The current study sought to develop and validate a measure which assesses positive recollections of experiences and emotions at home and with family...

Aims To assess the factorial validity and internal reliability of the International Trauma Questionnaire (ITQ) among a treatment-seeking sample of survivors of sexual violence in Ireland. In addition, to assess the diagnostic rate of post-traumatic stress disorder (PTSD) and complex post-traumatic stress disorder (CPTSD) among the samples. Methods...

Purpose The COVID-19 pandemic has affected the way many individuals go about their daily lives. This study attempted to model the complexity of change in lifestyle quality as a result of the COVID-19 pandemic and its context within the UK adult population. Methods Data from the COVID-19 Psychological Research Consortium Study (Wave 3, July 2020; N...

Objectives: The COVID-19 Psychological Research Consortium (C19PRC) Study was established in March 2020 to monitor the psychological and socio-economic impact of the pandemic in the UK and other countries. This paper describes the protocol for Wave 5 (March-April 2021). Methods: The survey assessed: COVID-19 related experiences; experiences of c...

Objective This paper presents the key findings from the Northern Ireland Youth Wellbeing Prevalence Survey (NIYWS), specifically the prevalence of common mental health disorders and their association with personal, familial and socio-economic risk factors. Methods The Northern Ireland Youth Wellbeing Survey (NIYWS) is a large nationally representa...

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 20...

Background Although a wealth of international literature consistently links cumulative experiences of adverse childhood experiences (ACEs) with physical, mental and emotional problems in later life, only a few studies have focused on intergenerational ACE exposure and research using nationally representative populations is lacking. Objective This...

Objective: The prevalence, construct validity, risk factors and psychopathological correlates associated with ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD) as measured by the International Trauma Questionnaire for Children and Adolescents (ITQ-CA) were assessed in a sample of young people from Northern Ireland. Method: Par...

High risk of mental health problems is associated with loneliness resulting from social distancing measures and “lockdowns” that have been imposed globally due to the COVID‐19 pandemic. This study explores the interconnectedness of loneliness, anxiety and depression on a symptom level using network analysis. A representative sample of participants...

Background: Taking a trauma informed care approach has demonstrated positive outcomes for services for people in the general population. Given the increased vulnerability to psychological trauma for adults with an intellectual disability, this study explores what residential staff know about trauma and trauma informed care. Methods: Thirty-two s...

The mental health consequences of the war in Ukraine will be enormous. Mental health professionals who are providing care for people in Ukraine, or those resettled elsewhere, may require access to standardized and validated assessment tools. We have developed a repository of mental health measures that are available in Ukrainian, Russian and Englis...

Developmental Trauma Disorder (DTD) is a proposed child psychopathology diagnosis with emotion/somatic, attention/behavioral, and self/relational dysregulation symptoms extending beyond posttraumatic stress disorder (PTSD). Confirmatory factor analyses (CFAs) tested four structural models with structured interview data for trauma history, PTSD, and...

Paranoia and belief in conspiracy theories both involve suspiciousness about the intentions of others but have rarely been studied together. In three studies, one with a mainly student sample (N = 496) and two with more representative UK population samples (N = 1,519, N = 638) we compared single and two-factor models of paranoia and conspiracy theo...

Objectives: The COVID-19 Psychological Research Consortium (C19PRC) Study was established in March 2020 to monitor the psychological and socio-economic impact of the pandemic in the UK and other countries. This paper describes the protocol for Wave 6 (August-September 2021). Methods: The survey assessed: COVID-19 related experiences; experiences of...

The mental health consequences of the war in Ukraine will be enormous. Mental health professionals who are providing care for people in Ukraine, or those resettled elsewhere, may require access to standardized and validated assessment tools. We have developed a repository of mental health measures that are available in Ukrainian, Russian, and Engli...

Introduction: The ICD-11 includes a new grouping for "disorders specifically associated with stress" that contains revised descriptions of posttraumatic stress disorder (PTSD) and adjustment disorder (AjD) and new diagnoses in the form of complex PTSD (CPTSD) and prolonged grief disorder (PGD). These disorders are similar in that they each require...

Objective: Given the highly infectious nature of COVID-19, social distancing practices are key in stemming the spread of the virus. We aimed to assess the complex interplay among psychological factors, socio-demographic characteristics and social distancing behaviours within the framework of the widely used Capability, Opportunity, Motivation-Beha...

Two theoretical perspectives have been proffered to explain changes in alcohol use during the pandemic: the ‘affordability-availability’ mechanism (i.e., drinking decreases due to changes in physical availability and/or reduced disposable income) and the ‘psychological-coping’ mechanism (i.e., drinking increases as adults attempt to cope with pande...

Background The Patient Health Questionnaire (PHQ-9) and Generalized Anxiety Disorder scale (GAD-7) are self-report measures of major depressive disorder and generalised anxiety disorder. The primary aim of this study was to test for differential item functioning (DIF) on the PHQ-9 and GAD-7 items based on age, sex (males and females), and country....

Backgrounds and Aims: The Northern Ireland Youth Wellbeing Survey (NIYWS) was commissioned by the Health and Social Care Board (NI) with the aim of providing reliable prevalence estimates of the mental health problems of children and young people aged 2-19 years. Method: The NIYWS used a random probability design, stratified by deprivation decile a...

This paper serves to alert IJPDS readers to the availability of a major new longitudinal survey data resource, the COVID-19 Psychological Research Consortium (C19PRC) Study, which is being released for secondary use via the Open Science Framework. The C19PRC Study is a rich and detailed dataset that provides a convenient and valuable foundation fro...

The beginning of the COVID-19 pandemic had a profound effect on all aspects of daily life and triggered a swell of anxiety across the world. Some suggest this emotional response to the pandemic can be explained through death anxiety (DA), a transdiagnostic dimension associated with numerous psychological disorders. However, it remains unclear as to...

The ICD-11 has introduced a new conceptualization of adjustment disorder (AjD) as a stress response syndrome with core symptoms of preoccupations and failure to adapt to the stressor. The current study aimed to assess the reliability and validity of the International Adjustment Disorder Questionnaire (IADQ) in two culturally distinct samples from I...

Background: The psychological impact of COVID-19 is multifaceted, both acute and chronic, and has not affected everyone equally. Method: This longitudinal study compared those with and without Adverse Childhood Experiences (ACEs) on measures of psychological distress and wellbeing. Results: All groups (No ACE, Low ACE, and High ACE) had similar l...

Aim : A recent mental health in sport consensus statement advocates Keyes’ two continua model with an associated Mental Health Continuum (MHC) instrument to assess mental health in athletes. However, there remains statistically inconsistent usage of the MHC in athletes, so further exploration of the MHC’s psychometric factors is required. Methods :...

Background Numerous studies found robust associations between psychosis and posttraumatic stress disorder (PTSD), but few have examined the relationships between psychosis and recently formulated ICD-11 Complex PTSD (CPTSD). Further, no known study has examined the effects of different traumatic life events on CPTSD and psychotic-like symptoms in a...

Background: Existing research on post-traumatic sequelae suggests a positive association between fatalism and symptoms of post-traumatic stress disorder (PTSD). However, the associations between fatalism and the new ICD-11 diagnosis of complex PTSD (CPTSD) have never been explored before. Objective: The current study explored the association bet...

COVID-19 continues to pose a threat to global public health. Multiple safe and effective vaccines against COVID-19 are available with one-third of the global population now vaccinated. Achieving a sufficient level of vaccine coverage to suppress COVID-19 requires, in part, sufficient acceptance among the public. However, relatively high rates of he...

Objectives: This paper outlines fieldwork procedures for Wave 4 of the COVID-19 Psychological Research Consortium (C19PRC) Study in the UK during November-December 2020. Methods: Respondents provided data on socio-political attitudes, beliefs, and behaviours, and mental health disorders (anxiety, depression, and posttraumatic stress). In Phase 1...

The validity of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD), as measured by the International Trauma Questionnaire (ITQ; Cloitre et al., 2018) has been supported in many factor analytic and mixture modelling studies. There is, however, a paucity of research investigating the latent structure of the ITQ using factor mixture...

Research has highlighted the role of dissociation in understanding the trauma–psychosis relationship. Moreover, it has been proposed that the association between trauma and psychotic symptoms may be both directly and indirectly explained by dissociative processes. The current study sought to investigate the relationship between age at first sexual...

University students routinely participate in research, including research on trauma and adversity, but the unique implications of trauma and adversity for educational and developmental outcomes for this group have received less attention. This study surveyed first year undergraduate students at an urban university located in the most ethnically div...

Background. Posttraumatic stress disorder (PTSD) is traditionally understood as a disorder that occurs more commonly in women than in men, and in younger age groups than in older age groups. The objective of this study was to determine if these patterns are also observed in relation to ICD-11 PTSD and Complex PTSD (CPTSD). Methods. Secondary data...

This paper serves to alert IJPDS readers to the availability of a major new longitudinal survey data resource, the COVID-19 Psychological Research Consortium (C19PRC) Study, which is being released for secondary use via the Open Science Framework. The C19PRC Study is a rich and detailed dataset that provides a convenient and valuable foundation fro...

Background This study investigated the role of a large range psychological, attitudinal and health related variables as predictors of depression trajectories amongst older adults over a 4-year time period. Methods Data from three consecutive waves of the TILDA survey of older community dwelling adults aged 50+ in Ireland were combined for analysis...

The COVID-19 pandemic has brought about unprecedented global changes in individual and collective behaviour. To reduce the spread of the virus, public health bodies have promoted social distancing measures while attempting to mitigate their mental health consequences. The current study aimed to identify cognitive predictors of social distancing adh...