Better knowledge about childhood trauma as a risk factor for psychiatric disorders in young people could help strengthen the timeliness and effectiveness of prevention and treatment efforts.

To estimate the prevalence and risk of psychiatric disorders in young people following exposure to childhood trauma, including interpersonal violence.

This prospective cohort study followed 8199 adolescents (age range 12–20 years) over 13–15 years, into young adulthood (age range 25–35 years). Data about childhood trauma exposure from adolescents participating in the Trøndelag Health Study (HUNT, 2006–2008) were linked to data about subsequent development of psychiatric disorders from the Norwegian Patient Registry (2008–2021).

One in four (24.3%) adolescents were diagnosed with a psychiatric disorder by young adulthood. Regression analyses showed consistent and significant relationships between childhood exposure to both interpersonal violence and other potentially traumatic events, and subsequent psychiatric disorders and psychiatric comorbidity. The highest estimates were observed for childhood exposure to two or more types of interpersonal violence (polyvictimisation), and development of psychotic disorders (odds ratio 3.41, 95% CI 1.93–5.72), stress and adjustment disorders (odds ratio 4.20, 95% CI 3.05–5.71), personality disorders (odds ratio 3.98, 95% CI 2.70–5.76), alcohol-related disorders (odds ratio 3.28, 95% CI 2.06–5.04) and drug-related disorders (odds ratio 4.67, 95% CI 2.87–7.33).

These findings emphasise the importance of integrating knowledge about childhood trauma as a potent risk factor for psychopathology into the planning and implementation of services for children, adolescents and young adults.

Trauma-related shame and guilt have been identified as important factors for mental health following interpersonal trauma. For survivors of terror and disasters, however, the role of shame and guilt remains largely unknown.

To explore the long-term occurrence of trauma-related shame and guilt among survivors of a terror attack, and the potential importance of these emotions for mental health.

A total of 347 survivors (48.7% female, mean age at the time of the attack: 19.25 years, s.d. = 4.40) of the 2011 massacre on Utøya island, Norway, participated in face-to-face, semi-structured interviews. Trauma-related shame and guilt were measured with items from the Shame and Guilt After Trauma Scale at 2.5 and 8.5 years post-terror attack. Post-traumatic reactions and anxiety/depression at 8.5 years post-terror attack were measured with the University of California at Los Angeles PTSD Reaction Index and the Hopkins Symptom Checklist-25, respectively. Associations between trauma-related shame/guilt and post-trauma psychopathology were analysed by multiple linear regressions.

Trauma-related shame and guilt were prevalent among survivors at both 2.5 and 8.5 years post-terror attack. In unadjusted analyses, shame and guilt, at both time points, were significantly associated with post-traumatic stress reactions and anxiety/depression. Shame remained significantly associated with mental health when adjusted for guilt. Both earlier and current shame were uniquely related to mental health.

Trauma-related shame and guilt may be prevalent in survivors of mass trauma several years after the event. Shame, in particular, may play an important role for long-term mental health. Clinicians may find it helpful to explicitly address shame in treatment of mass trauma survivors.

Although youths in many countries have been exposed to terrorism, few studies have examined early risk and protective factors for the subsequent development of mental health problems.

To investigate the levels of post-traumatic stress in survivors of the 2011 massacre on Ut⊘ya Island compared with the general population in Norway, and to identify predictive factors.

Four hundred and ninety survivors were invited to participate. Structured face-to-face interviews were performed 4–5 months after the attack.

There were 325 study participants (response rate 66%). Survivors had been highly exposed to danger and loss. Post-traumatic stress levels were more than six times higher in survivors than in the general population. Predictors were female gender, minority ethnic status, high level of trauma exposure, pain, the loss of someone close and social support.

Survivor characteristics that can be assessed in the early aftermath of a terrorist attack strongly predict the subsequent mental health problems of exposed youths. The highly elevated symptoms observed were largely attributable to the traumatic experience and reflect the mental health costs of the terrorist attack.