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Traumatic life events as risk factors for psychosis and ICD-11 complex PTSD: a gender-specific examination (2021)
Journal Article
Ho, G. W. K., Hyland, P., Karatzias, T., Bressington, D., & Shevlin, M. (2021). Traumatic life events as risk factors for psychosis and ICD-11 complex PTSD: a gender-specific examination. European Journal of Psychotraumatology, 12(1), Article 2009271. htt

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... Read More about Traumatic life events as risk factors for psychosis and ICD-11 complex PTSD: a gender-specific examination.

Mediating role of avoidance of trauma disclosure and social disapproval in ICD-11 post-traumatic stress disorder and complex post-traumatic stress disorder: cross-sectional study in a Lithuanian clinical sample (2021)
Journal Article
Kvedaraite, M., Gelezelyte, O., Karatzias, T., Roberts, N. P., & Kazlauskas, E. (2021). Mediating role of avoidance of trauma disclosure and social disapproval in ICD-11 post-traumatic stress disorder and complex post-traumatic stress disorder: cross-sect

Background. ICD-11 includes a new trauma-related complex posttraumatic stress disorder (CPTSD), resulting predominantly from reoccurring or prolonged trauma. Previous studies showed that lack of social support is among the strongest predictors of PTS... Read More about Mediating role of avoidance of trauma disclosure and social disapproval in ICD-11 post-traumatic stress disorder and complex post-traumatic stress disorder: cross-sectional study in a Lithuanian clinical sample.

Fatalism and ICD-11 CPTSD and PTSD diagnoses: Results from Nigeria, Kenya & Ghana (2021)
Journal Article
Levin, Y., Bachem, R., Palgi, Y., Hyland, P., Karatzias, T., Shevlin, M., Ben-Ezra, M., & Maercker, A. (2021). Fatalism and ICD-11 CPTSD and PTSD diagnoses: Results from Nigeria, Kenya & Ghana. European Journal of Psychotraumatology, 12(1), Article 198845

Background: Existing research on posttraumatic sequelae suggests a positive association between fatalism and symptoms of posttraumatic stress disorder (PTSD). However, the associations between fatalism and the new ICD-11 diagnosis of complex PTSD (CP... Read More about Fatalism and ICD-11 CPTSD and PTSD diagnoses: Results from Nigeria, Kenya & Ghana.

The Latent Structure of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD in a General Population Sample from USA: A Factor Mixture Modelling Approach (2021)
Journal Article
Redican, E., Cloitre, M., Hyland, P., McBride, O., Karatzias, T., Murphy, J., & Shevlin, M. (2022). The Latent Structure of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD in a General Population Sample from USA: A Factor Mixture Modelling Ap

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... Read More about The Latent Structure of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD in a General Population Sample from USA: A Factor Mixture Modelling Approach.

Design, content, and fieldwork procedures of the COVID-19 Psychological Research Consortium (C19PRC) Study – Wave 4 (2021)
Journal Article
McBride, O., Butter, S., Murphy, J., Shevlin, M., Hartman, T. K., Bennett, K. M., …Bentall, R. P. (2022). Design, content, and fieldwork procedures of the COVID-19 Psychological Research Consortium (C19PRC) Study – Wave 4. International Journal of Met

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 be... Read More about Design, content, and fieldwork procedures of the COVID-19 Psychological Research Consortium (C19PRC) Study – Wave 4.

Detecting and describing stability and change in COVID-19 vaccine receptibility in the United Kingdom and Ireland (2021)
Journal Article
Hyland, P., Vallières, F., Hartman, T. K., McKay, R., Butter, S., Bentall, R. P., …Murphy, J. (2021). Detecting and describing stability and change in COVID-19 vaccine receptibility in the United Kingdom and Ireland. PLOS ONE, 16(11), https://doi.org/1

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 COVI... Read More about Detecting and describing stability and change in COVID-19 vaccine receptibility in the United Kingdom and Ireland.

Co-occurrence of severe PTSD, Somatic Symptoms and Dissociation in a large sample of childhood trauma inpatients: A Network Analysis (2021)
Journal Article
Kratzer, L., Knefel, M., Haselgruber, A., Heinz, P., Schennach, R., & Karatzias, T. (2022). Co-occurrence of severe PTSD, Somatic Symptoms and Dissociation in a large sample of childhood trauma inpatients: A Network Analysis. European Archives of Psychiat

Co-occurrence of mental disorders including severe PTSD, somatic symptoms, and dissociation in the aftermath of trauma is common and sometimes associated with poor treatment outcomes. However, the interrelationships between these conditions at sympto... Read More about Co-occurrence of severe PTSD, Somatic Symptoms and Dissociation in a large sample of childhood trauma inpatients: A Network Analysis.

Sex and age differences in ICD-11 PTSD and Complex PTSD: An analysis of four general 2 population samples (2021)
Journal Article
McGinty, G., Fox, R., Ben-Ezra, M., Cloitre, M., Karatzias, T., Shevlin, M., & Hyland, P. (2021). Sex and age differences in ICD-11 PTSD and Complex PTSD: An analysis of four general 2 population samples. European Psychiatry, 64(1), https://doi.org/10.119

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 patte... Read More about Sex and age differences in ICD-11 PTSD and Complex PTSD: An analysis of four general 2 population samples.

Complex post-traumatic stress disorder in asylum seekers and victims of trafficking: treatment considerations (2021)
Journal Article
Jowett, S., Argyriou, A., Scherrer, O., Karatzias, T., & Katona, C. (2021). Complex post-traumatic stress disorder in asylum seekers and victims of trafficking: treatment considerations. BJPsych Open, 7(6), Article e181. https://doi.org/10.1192/bjo.2021.1

Asylum-seekers experience high levels of traumatic events pre, post, and during migration. Polytraumatisation is associated with Complex PTSD (CPTSD), which has not yet been extensively explored in this population. CPTSD is a prevalent and highly dis... Read More about Complex post-traumatic stress disorder in asylum seekers and victims of trafficking: treatment considerations.

Delay discounting and under-valuing of recent information predict poorer adherence to social distancing measures during the COVID-19 pandemic (2021)
Journal Article
Lloyd, A., McKay, R., Hartman, T. K., Vincent, B. T., Murphy, J., Gibson-Miller, J., …Mason, L. (2021). Delay discounting and under-valuing of recent information predict poorer adherence to social distancing measures during the COVID-19 pandemic. Scient

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 he... Read More about Delay discounting and under-valuing of recent information predict poorer adherence to social distancing measures during the COVID-19 pandemic.

Trajectories of change in internalizing symptoms during the COVID-19 pandemic: A longitudinal population-based study (2021)
Journal Article
Hyland, P., Vallières, F., Daly, M., Butter, S., Bentall, R. P., Fox, R., …Shevlin, M. (2021). Trajectories of change in internalizing symptoms during the COVID-19 pandemic: A longitudinal population-based study. Journal of Affective Disorders, 295, 10

Background: Longitudinal data indicates that the mental health of the general population may not have been as badly affected by the COVID-19 pandemic as some had feared. Most studies examining change in mental health during the pandemic have assumed... Read More about Trajectories of change in internalizing symptoms during the COVID-19 pandemic: A longitudinal population-based study.

Dimensional latent structure of ICD-11 posttraumatic stress disorder, complex PTSD, and adjustment disorder: Evidence from Ghana, Kenya, and Nigeria (2021)
Journal Article
Charak, R., Cano-Gonzalez, I., Shevlin, M., Ben-Ezra, M., Karatzias, T., & Hyland, P. (2022). Dimensional latent structure of ICD-11 posttraumatic stress disorder, complex PTSD, and adjustment disorder: Evidence from Ghana, Kenya, and Nigeria. Traumatolog

With the release of ICD-11 in 2018, there has been a surge in studies examining the nosology of mental disorders, including disorders associated with stress, namely, posttraumatic stress disorder (PTSD), complex PTSD (CPTSD), and adjustment disorder... Read More about Dimensional latent structure of ICD-11 posttraumatic stress disorder, complex PTSD, and adjustment disorder: Evidence from Ghana, Kenya, and Nigeria.

ICD-11 ‘Mixed Depressive and Anxiety Disorder’ is Clinical Rather than Sub-Clinical and More Common than Anxiety and Depression in the General Population (2021)
Journal Article
Shevlin, M., Hyland, P., Nolan, E., Owczarek, M., Ben-Ezra, M., & Karatzias, T. (2022). ICD-11 ‘Mixed Depressive and Anxiety Disorder’ is Clinical Rather than Sub-Clinical and More Common than Anxiety and Depression in the General Population. British

Background: The new International Classification of Diseases was published in 2018 (ICD-11; World Health Organization, 2018) and now includes ‘Mixed depressive and anxiety disorder’ (6A73: MDAD) designated as a mood disorder. This disorder is defined... Read More about ICD-11 ‘Mixed Depressive and Anxiety Disorder’ is Clinical Rather than Sub-Clinical and More Common than Anxiety and Depression in the General Population.

Predicting risk along the suicidality continuum: A longitudinal, nationally representative study of the Irish population during the COVID-19 pandemic (2021)
Journal Article
Hyland, P., Rochford, S., Munnelly, A., Dodd, P., Fox, R., Vallières, F., …Murphy, J. (2022). Predicting risk along the suicidality continuum: A longitudinal, nationally representative study of the Irish population during the COVID-19 pandemic. Suicide

Introduction: Little is known about the lifetime prevalence of different indicators of suicidality in the Irish general population; whether suicidality has increased during the COVID-19 pandemic; and what factors associated with belonging to differen... Read More about Predicting risk along the suicidality continuum: A longitudinal, nationally representative study of the Irish population during the COVID-19 pandemic.

Psychological trauma at different developmental stages and ICD-11 CPTSD: The role of dissociation (2021)
Journal Article
Jowett, S., Karatzias, T., Shevlin, M., & Hyland, P. (2022). Psychological trauma at different developmental stages and ICD-11 CPTSD: The role of dissociation. Journal of Trauma and Dissociation, 23(1), 52-67. https://doi.org/10.1080/15299732.2021.1934936

Background: Dissociation is commonly reported by individuals who meet criteria for PTSD and Complex PTSD. However, the association between the age of trauma exposure, dissociation and CPTSD is not well understood. The current study aimed to test whet... Read More about Psychological trauma at different developmental stages and ICD-11 CPTSD: The role of dissociation.

Context, design and conduct of the longitudinal COVID-19 Psychological Research Consortium (C19PRC) Study – Wave 3 (2021)
Journal Article
McBride, O., Butter, S., Murphy, J., Shevlin, M., Hartman, T. K., Hyland, P., …Bentall, R. P. (2021). Context, design and conduct of the longitudinal COVID-19 Psychological Research Consortium (C19PRC) Study – Wave 3. International Journal of Methods

Objectives: The COVID-19 Psychological Research Consortium (C19PRC) Study aims to assess the impact of the COVID-19 pandemic in the adult population in multiple countries. This paper describes the third wave of the UK survey (the ‘parent’ strand of t... Read More about Context, design and conduct of the longitudinal COVID-19 Psychological Research Consortium (C19PRC) Study – Wave 3.

The network structure of ICD-11 Adjustment Disorder: A cross-cultural comparison of three African countries (2021)
Journal Article
Levin, Y., Bachem, R., Karatzias, T., Shevlin, M., Maercker, A., & Ben-Ezra, M. (2021). The network structure of ICD-11 Adjustment Disorder: A cross-cultural comparison of three African countries. British Journal of Psychiatry, 219(4), 557-564. https://do

Background: Adjustment disorder (AjD) is one of the most widespread mental disorders worldwide. In ICD-11, AjD is characterized by two main symptom clusters; preoccupation with the stressor and failure to adapt. The network analytic approach has been... Read More about The network structure of ICD-11 Adjustment Disorder: A cross-cultural comparison of three African countries.

A longitudinal assessment of depression and anxiety in the Republic of Ireland before and during the COVID-19 pandemic (2021)
Journal Article
Hyland, P., Shevlin, M., Murphy, J., McBride, O., Fox, R., Bondjers, K., …Vallières, F. (2021). A longitudinal assessment of depression and anxiety in the Republic of Ireland before and during the COVID-19 pandemic. Psychiatry Research, 300, Article 11

Few studies have examined changes in mental health before and after the outbreak of COVID-19. We examined changes in the prevalence of major depression and generalized anxiety disorder (GAD) between February 2019 and March-April 2020; if there were c... Read More about A longitudinal assessment of depression and anxiety in the Republic of Ireland before and during the COVID-19 pandemic.

PTSD and complex PTSD in adolescence: discriminating factors in a population-based cross-sectional study (2021)
Journal Article
Daniunaite, I., Cloitre, M., Karatzias, T., Shevlin, M., Thoresen, S., Zelviene, P., & Kazlauskas, E. (2021). PTSD and complex PTSD in adolescence: discriminating factors in a population-based cross-sectional study. European Journal of Psychotraumatology,

Background: Chronic and repeated trauma are well-established risk factors for complex posttraumatic stress disorder (CPTSD) in adult samples. Less is known about how trauma history and other factors contribute to the development of CPTSD in adolescen... Read More about PTSD and complex PTSD in adolescence: discriminating factors in a population-based cross-sectional study.

A Systematic Literature Review of Factor Analytic and Mixture Models of ICD-11 PTSD and CPTSD using the International Trauma Questionnaire (2021)
Journal Article
Redican, E., Nolan, E., Hyland, P., Cloitre, M., McBride, O., Karatzias, T., Murphy, J., & Shevlin, M. (2021). A Systematic Literature Review of Factor Analytic and Mixture Models of ICD-11 PTSD and CPTSD using the International Trauma Questionnaire. Jour

The 11th version of the International Classification of Diseases (ICD-11; WHO, 2018) describes two distinct trauma related disorders, Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD). This review aims to summarise and synthesize evidence... Read More about A Systematic Literature Review of Factor Analytic and Mixture Models of ICD-11 PTSD and CPTSD using the International Trauma Questionnaire.

ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD) in Treatment Seeking Veterans: Risk factors and comorbidity (2021)
Journal Article
Murphy, D., Karatzias, T., Busuttil, W., Greenberg, N., & Shevlin, M. (2021). ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD) in Treatment Seeking Veterans: Risk factors and comorbidity. Social Psychiatry and Psychiatric Epidemiology,

Purpose: Emerging evidence suggests that ICD-11 CPTSD is a more common condition than PTSD in treatment seeking samples although no study has explored risk factors and comorbidities of PTSD and CPTSD in veteran populations. In this study risk factors... Read More about ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD (CPTSD) in Treatment Seeking Veterans: Risk factors and comorbidity.

ICD-11 Complex Post Traumatic Stress Disorder (CPTSD) in parents with perinatal bereavement: Implications for treatment and care (2021)
Journal Article
Hollins Martin, C. J., Patterson, J., Paterson, C., Welsh, N., Dougall, N., Karatzias, T., & Williams, B. (2021). ICD-11 Complex Post Traumatic Stress Disorder (CPTSD) in parents with perinatal bereavement: Implications for treatment and care. Midwifery,

The 11th revision of the WHO International Classification of Diseases (ICD-11) has identified Complex PTSD (CPTSD) as a new condition. Aim: To explore whether the new diagnosis of CPTSD (ICD11) is relevant to women who have experienced perinatal be... Read More about ICD-11 Complex Post Traumatic Stress Disorder (CPTSD) in parents with perinatal bereavement: Implications for treatment and care.

Pandemic buying: Testing a psychological model of over-purchasing and panic buying using data from the United Kingdom and the Republic of Ireland during the early phase of the COVID-19 pandemic (2021)
Journal Article
Bentall, R. P., Lloyd, A., Bennett, K., McKay, R., Mason, L., Murphy, J., …Shevlin, M. (2021). Pandemic buying: Testing a psychological model of over-purchasing and panic buying using data from the United Kingdom and the Republic of Ireland during the e

The over-purchasing and hoarding of necessities is a common response to crises, especially in developed economies where there is normally an expectation of plentiful supply. This behaviour was observed internationally during the early stages of the C... Read More about Pandemic buying: Testing a psychological model of over-purchasing and panic buying using data from the United Kingdom and the Republic of Ireland during the early phase of the COVID-19 pandemic.

Comparing the network structure of ICD-11 PTSD and complex PTSD in three African countries   (2021)
Journal Article
Levin, Y., Hyland, P., Karatzias, T., Shevlin, M., & Ben-Ezra, M. (2021). Comparing the network structure of ICD-11 PTSD and complex PTSD in three African countries  . Journal of Psychiatric Research, 136, 80-86. https://doi.org/10.1016/j.jpsychires.202

Background: Symptom network analysis has become an essential tool for researchers and clinicians investigating the structure of mental disorders. Two methods have been used; one relies on partial correlations, and the second relies on zero order corr... Read More about Comparing the network structure of ICD-11 PTSD and complex PTSD in three African countries  .

Moral Injury and ICD-11 Complex PTSD (CPTSD) Symptoms among Treatment-Seeking Veterans in the United Kingdom (2021)
Journal Article
Currier, J. M., Foster, J. D., Karatzias, T., & Murphy, D. (2021). Moral Injury and ICD-11 Complex PTSD (CPTSD) Symptoms among Treatment-Seeking Veterans in the United Kingdom. Psychological Trauma: Theory, Research, Practice, and Policy, 13(4), 417-421.

Military veterans often encounter events with chronic or repeated traumas of an interpersonal nature that might lead to emotional, relational, and spiritual suffering. Research is needed to assess whether and/or how emerging conceptions of moral inju... Read More about Moral Injury and ICD-11 Complex PTSD (CPTSD) Symptoms among Treatment-Seeking Veterans in the United Kingdom.

Childhood trauma, attachment orientation and Complex PTSD (CPTSD) symptoms in a clinical sample: Implications for treatment (2021)
Journal Article
Karatzias, T., Shevlin, M., Ford, J. D., Fyvie, C., Grandison, G., Hyland, P., & Cloitre, M. (2022). Childhood trauma, attachment orientation and Complex PTSD (CPTSD) symptoms in a clinical sample: Implications for treatment. Development and Psychopatholo

Although there has been significant work on the association between Posttraumatic Stress Disorder (PTSD) and attachment orientation, this is less the case for Complex PTSD (CPTSD). The primary aim of this paper was to assess the strength of the assoc... Read More about Childhood trauma, attachment orientation and Complex PTSD (CPTSD) symptoms in a clinical sample: Implications for treatment.

PTSD and complex PTSD in sentenced male prisoners in the UK: prevalence, trauma antecedents, and psychiatric comorbidities (2021)
Journal Article
Facer-Irwin, E., Karatzias, T., Bird, A., Blackwood, N., & MacManus, D. (2022). PTSD and complex PTSD in sentenced male prisoners in the UK: prevalence, trauma antecedents, and psychiatric comorbidities. Psychological Medicine, 52(13), 2794-2804. https://

Background Posttraumatic stress disorder (PTSD) is highly prevalent within prison settings, yet is often unidentified and undertreated. Complex PTSD (CPTSD) has been recently formally recognised in the International Classification of Diseases 11th r... Read More about PTSD and complex PTSD in sentenced male prisoners in the UK: prevalence, trauma antecedents, and psychiatric comorbidities.

Complex PTSD symptoms mediate the association between childhood trauma and physical health problems (2021)
Journal Article
Ho, G. W., Karatzias, T., Vallières, F., Bondjers, K., Shevlin, M., Cloitre, M., …Hyland, P. (2021). Complex PTSD symptoms mediate the association between childhood trauma and physical health problems. Journal of Psychosomatic Research, 142, Article 11

The ICD-11 reconceptualized Posttraumatic Stress Disorder (PTSD) as a narrowly defined fear-based disorder, and introduced Complex PTSD (CPTSD) as a new diagnosis comprised of PTSD symptoms and symptoms of ‘Disturbances in Self-Organization’ (DSO) th... Read More about Complex PTSD symptoms mediate the association between childhood trauma and physical health problems.

The Authoritarian Dynamic During the COVID-19 Pandemic: Effects on Nationalism and Anti-Immigrant Sentiment (2021)
Journal Article
Hartman, T. K., Stocks, T. V., Mckay, R., Gibson Miller, J., Levita, L., Martinez, A. P., …Bentall, R. P. (2021). The Authoritarian Dynamic During the COVID-19 Pandemic: Effects on Nationalism and Anti-Immigrant Sentiment. Social Psychological and Perso

Research has demonstrated that situational factors such as perceived threats to the social order activate latent authoritarianism. The deadly COVID-19 pandemic presents a rare opportunity to test whether existential threat stemming from an indiscrimi... Read More about The Authoritarian Dynamic During the COVID-19 Pandemic: Effects on Nationalism and Anti-Immigrant Sentiment.