Skip to main content

Research Repository

Advanced Search

Prof Thanos Karatzias' Outputs (252)

Experiences of Social Disconnection in a Bereaved Community Sample from Ontario, Canada (2025)
Journal Article
Nolan, E., Redican, E., Hyland, P., Duffy, M., Karatzias, T., & Shevlin, M. (in press). Experiences of Social Disconnection in a Bereaved Community Sample from Ontario, Canada. Journal of Loss and Trauma,

Lower perceived social support is a known risk factor for problematic grief reactions, but specific facets such as social disconnection may play a critical role in shaping grief responses. This study utilized the Oxford-Grief Social Disconnection Sca... Read More about Experiences of Social Disconnection in a Bereaved Community Sample from Ontario, Canada.

Complex PTSD and identification with the aggressor among survivors of childhood abuse (2024)
Journal Article
Lahav, Y., Cloitre, M., Hyland, P., Shevlin, M., Ben-Ezra, M., & Karatzias, T. (2025). Complex PTSD and identification with the aggressor among survivors of childhood abuse. Child Abuse and Neglect, 160, Article 107196. https://doi.org/10.1016/j.chiabu.2024.107196

Background: Childhood abuse (CA) is a risk factor for trauma-related disorders including posttraumatic stress disorder (PTSD) and complex posttraumatic stress disorder (CPTSD). This severe form of interpersonal trauma may result in "identification wi... Read More about Complex PTSD and identification with the aggressor among survivors of childhood abuse.

The psychological burden of bereavement in the general population of UK and Ireland (2024)
Journal Article
Redican, E., Shevlin, M., Hyland, P., Murphy, J., Duffy, M., & Karatzias, T. (online). The psychological burden of bereavement in the general population of UK and Ireland. Death Studies, https://doi.org/10.1080/07481187.2024.2420877

This study examined the experiences of loss among bereaved adults, and the association between loss-related factors and mental health outcomes. Participants were 2023 bereaved adults from the United Kingdom and Ireland who completed measures of their... Read More about The psychological burden of bereavement in the general population of UK and Ireland.

How do you become resilient? A critical realist explanation of the youth resilience process (2024)
Journal Article
Ho, G. W., Leung, D. Y., Chan, A. C., Bressington, D. T., & Karatzias, T. (online). How do you become resilient? A critical realist explanation of the youth resilience process. Adversity and Resilience Science, https://doi.org/10.1007/s42844-024-00154-z

Adversities serve as risks, but also opportunities to acquire capacities to adjust positively in future stressors. There is now considerable agreement that resilience should be viewed as a process. However, a key question remains: Why do some individ... Read More about How do you become resilient? A critical realist explanation of the youth resilience process.

Hierarchical Network Structure: A Novel Approach to Conceptualising ICD-11 Complex PTSD using a general population sample from Africa (2024)
Journal Article
Robinson, M., Levin, Y., Hyland, P., Karatzias, T., & Ben-Ezra, M. (2025). Hierarchical Network Structure: A Novel Approach to Conceptualising ICD-11 Complex PTSD using a general population sample from Africa. Journal of Affective Disorders, 369, 813-818. https://doi.org/10.1016/j.jad.2024.10.015

Background
Investigations have sought to model the structure of ICD-11 Complex PTSD (CPTSD) using factor analytic models, finding support for higher-order domains representing PTSD and Disturbances in Self Organisation (DSO). Network analysis has a... Read More about Hierarchical Network Structure: A Novel Approach to Conceptualising ICD-11 Complex PTSD using a general population sample from Africa.

Do Psychological Treatments for PTSD in Children and Young People Reduce Trauma- Related Appraisals? A Systematic Review and Meta-Analysis (2024)
Journal Article
Smith, C., Ford, C., Baldwin, G., Jensen, T. K., Karatzias, T., Skogbrott Birkeland, M., & Meiser-Stedman, R. (2024). Do Psychological Treatments for PTSD in Children and Young People Reduce Trauma- Related Appraisals? A Systematic Review and Meta-Analysis. Behaviour Research and Therapy, 182, Article 104621. https://doi.org/10.1016/j.brat.2024.104621

Research is increasingly highlighting the role of negative trauma-related appraisals in child and adolescent post-traumatic stress disorder (PTSD). The cognitive model of PTSD claims that an essential mechanism of treatment is a reduction in these ap... Read More about Do Psychological Treatments for PTSD in Children and Young People Reduce Trauma- Related Appraisals? A Systematic Review and Meta-Analysis.

Self-harm, suicide, and ICD-11 complex posttraumatic stress disorder in treatment-seeking adolescents with major depression (2024)
Journal Article
Liu, H., Ho, G. W., Karatzias, T., Shevlin, M., Wong, K. H., & Hyland, P. (2024). Self-harm, suicide, and ICD-11 complex posttraumatic stress disorder in treatment-seeking adolescents with major depression. Journal of Child and Adolescent Trauma, 17(4), 1057-1066. https://doi.org/10.1007/s40653-024-00655-0

Posttraumatic stress disorder (PTSD) is linked with self-harm and suicide, but few studies have examined these severe outcomes in relation to complex trauma. This study examined the associations between self-harm and suicide-related phenomena with IC... Read More about Self-harm, suicide, and ICD-11 complex posttraumatic stress disorder in treatment-seeking adolescents with major depression.

Assessing Self-Reported Prolonged Grief Disorder with ‘Clinical Checks’: A Proof of Principle Study (2024)
Journal Article
Shevlin, M., Hyland, P., Cloitre, M., Brewin, C., Martsenkovskyi, D., Ben-Ezra, M., Bondjers, K., Karatzias, T., Duffy, M., & Redican, E. (2025). Assessing Self-Reported Prolonged Grief Disorder with ‘Clinical Checks’: A Proof of Principle Study. Journal of Traumatic Stress, 38(1), 174-180. https://doi.org/10.1002/jts.23100

Psychological assessment is commonly conducted using either self-report measures or clinical interviews; the former are quick and easy to administer, and the later are more time consuming and require training. Self-report measures have been criticise... Read More about Assessing Self-Reported Prolonged Grief Disorder with ‘Clinical Checks’: A Proof of Principle Study.

Physical, mental, and behavioral health after adverse and benevolent childhood experiences: a comparison of two adversity conceptualizations (2024)
Journal Article
Ho, G. W., Ling Chan, K., Ho Wong, K., Fong Leung, S., & Karatzias, T. (online). Physical, mental, and behavioral health after adverse and benevolent childhood experiences: a comparison of two adversity conceptualizations. Psychological Trauma: Theory, Research, Practice, and Policy, https://doi.org/10.1037/tra0001732

Objective: Adverse and benevolent childhood experiences (ACEs, BCEs) impact health across the lifespan. No known study has investigated these associations across different health domains using a representative adult sample. This study examined the as... Read More about Physical, mental, and behavioral health after adverse and benevolent childhood experiences: a comparison of two adversity conceptualizations.

Testing the distinctiveness of prolonged grief disorder from posttraumatic stress disorder and depression in large bereaved community samples. (2024)
Journal Article
Shevlin, M., Redican, E., Karatzias, T., & Hyland, P. (in press). Testing the distinctiveness of prolonged grief disorder from posttraumatic stress disorder and depression in large bereaved community samples. Journal of Affective Disorders Reports, 363, 214-220. https://doi.org/10.1016/j.jad.2024.07.127

Background: This study sought to test the distinctiveness of symptoms of prolonged grief disorder (PGD) from posttraumatic stress disorder (PTSD) and depression.
Methods: Confirmatory factor analysis (CFA) and target exploratory factor analysis (EF... Read More about Testing the distinctiveness of prolonged grief disorder from posttraumatic stress disorder and depression in large bereaved community samples..

Severe dissociative experiences beyond detachment in a large clinical sample of inpatients with PTSD: Diagnostic and treatment implications (2024)
Journal Article
Kratzer, L., Tschöke, S., Schröder, J., Shevlin, M., Hyland, P., Eckenberger, C., Heinz, P., & Karatzias, T. (2024). Severe dissociative experiences beyond detachment in a large clinical sample of inpatients with PTSD: Diagnostic and treatment implications. Psychopathology, 57(6), 519-527. https://doi.org/10.1159/000539740

Introduction: The fifth edition of the Diagnostic and Statistical Manual of Mental Disorders (DSM-5; American Psychiatric Association, 2013) contains a dissociative subtype of post-traumatic stress disorder (PTSD) characterized by depersonalization a... Read More about Severe dissociative experiences beyond detachment in a large clinical sample of inpatients with PTSD: Diagnostic and treatment implications.

Development and validation of the caregiver-report version of the international grief questionnaire (IGQ-CG): Results from a Ukrainian sample of parents (2024)
Journal Article
Redican, E., Shevlin, M., Hyland, P., Karatzias, T., Martsenkovskyi, D., & Ben-Ezra, M. (2024). Development and validation of the caregiver-report version of the international grief questionnaire (IGQ-CG): Results from a Ukrainian sample of parents. Clinical Child Psychology and Psychiatry, 29(4), 1481-1496. https://doi.org/10.1177/13591045241260897

The International Grief Questionnaire (IGQ) is a self-report measure of ICD-11 Prolonged Grief Disorder (PGD) in adults. This study sought to develop and validate a caregiver-report version of the IGQ for children and adolescents aged 7–17 years; the... Read More about Development and validation of the caregiver-report version of the international grief questionnaire (IGQ-CG): Results from a Ukrainian sample of parents.

Childhood adversity and mental health admission patterns prior to young person suicide (CHASE): a case-control 36 year linked hospital data study, Scotland UK 1981–2017 (2024)
Journal Article
Dougall, N., Savinc, J., Maxwell, M., Karatzias, T., O’Connor, R. C., Williams, B., John, A., Cheyne, H., Fyvie, C., Bisson, J. I., Hibberd, C., Abbott-Smith, S., Nolan, L., & Murray, J. (2024). Childhood adversity and mental health admission patterns prior to young person suicide (CHASE): a case-control 36 year linked hospital data study, Scotland UK 1981–2017. BJPsych Open, 10(4), Article e124. https://doi.org/10.1192/bjo.2024.69

Background
Childhood adversity (CA) is associated with increased later mental health (MH) problems and suicidal behaviour. Opportunities for earlier healthcare identification and intervention are needed.

Aim
To determine associations between hos... Read More about Childhood adversity and mental health admission patterns prior to young person suicide (CHASE): a case-control 36 year linked hospital data study, Scotland UK 1981–2017.

Enhanced Skills Training in Affective and Interpersonal Regulation versus Treatment as Usual for ICD-11 Complex PTSD: A Pilot Randomised Controlled Trial (The RESTORE Trial) (2024)
Journal Article
Karatzias, T., Shevlin, M., Cloitre, M., Busuttil, W., Graham, K., Hendrikx, L., Hyland, P., Biscoe, N., & Murphy, D. (2024). Enhanced Skills Training in Affective and Interpersonal Regulation versus Treatment as Usual for ICD-11 Complex PTSD: A Pilot Randomised Controlled Trial (The RESTORE Trial). Psychotherapy and Psychosomatics, 93(3), 203-215. https://doi.org/10.1159/000538428

Introduction
Complex PTSD (CPTSD) is a relatively new condition in ICD-11. This pilot randomised controlled trial aimed to compare a four-module intervention developed to target all symptoms of ICD-11 CPTSD, namely Enhanced Skills in Affective and... Read More about Enhanced Skills Training in Affective and Interpersonal Regulation versus Treatment as Usual for ICD-11 Complex PTSD: A Pilot Randomised Controlled Trial (The RESTORE Trial).

Prevalence and Validity of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD: A Population-Based Survey of Hong Kong Adults (2024)
Journal Article
Ho, G. W., Chan, K. L., Karatzias, T., Hyland, P., Fung, H. W., & Shevlin, M. (2024). Prevalence and Validity of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD: A Population-Based Survey of Hong Kong Adults. Asian Journal of Psychiatry, 96, Article 104045. https://doi.org/10.1016/j.ajp.2024.104045

The present study aimed to report the prevalence of ICD-11 posttraumatic stress disorder (PTSD) and complex PTSD (CPTSD) in the general adult Hong Kong population, and examine the validity of the Chinese International Trauma Questionnaire (ITQ). This... Read More about Prevalence and Validity of ICD-11 Posttraumatic Stress Disorder (PTSD) and Complex PTSD: A Population-Based Survey of Hong Kong Adults.

Mental health in Ukraine in 2023 (2024)
Journal Article
Martsenkovskyi, D., Shevlin, M., Ben-Ezra, M., Bondjers, K., Fox, R., Karatzias, T., Martsenkovska, I., Martsenkovsky, I., Pfeiffer, E., Sachser, C., Vallières, F., & Hyland, P. (2024). Mental health in Ukraine in 2023. European Psychiatry, 67(1), Article e27. https://doi.org/10.1192/j.eurpsy.2024.12

Background
Very little is known about the mental health of the adult population of Ukraine following Russia’s full-scale invasion in February 2022. In this study, we estimated the prevalence of seven mental health disorders, the proportion of adults... Read More about Mental health in Ukraine in 2023.

Prevalence and correlates of ICD-11 prolonged grief disorder among adults living in Ukraine during the war with Russia (2024)
Journal Article
Redican, E., Hyland, P., Shevlin, M., Martsenkovskyi, D., Karatzias, T., & Ben-Ezra, M. (2024). Prevalence and correlates of ICD-11 prolonged grief disorder among adults living in Ukraine during the war with Russia. Acta Psychiatrica Scandinavica, 149(5), 425-435. https://doi.org/10.1111/acps.13678

Background: Although high rates of bereavement are evident in war-affected populations, no study has investigated the prevalence and correlates of probable ICD-11 Prolonged Grief Disorder (PGD) under these circumstances.

Methods: Participants we... Read More about Prevalence and correlates of ICD-11 prolonged grief disorder among adults living in Ukraine during the war with Russia.

Correlates of Posttraumatic Stress Disorder in the Aftermath of the February 2023 Earthquake in Turkey (2024)
Journal Article
Han Alpay, E., Redican, E., Hyland, P., Karatzias, T., & Shevlin, M. (2024). Correlates of Posttraumatic Stress Disorder in the Aftermath of the February 2023 Earthquake in Turkey. Journal of Loss and Trauma, 29(6), 605-622. https://doi.org/10.1080/15325024.2024.2314306

On February 6, 2023, an earthquake registering 7.8 on the Richter scale struck southeast Turkey, and this was followed by a second earthquake of magnitude 7.5. The earthquake resulted in widespread loss, devastation, and destruction, and is anticipat... Read More about Correlates of Posttraumatic Stress Disorder in the Aftermath of the February 2023 Earthquake in Turkey.