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BACKGROUND: Penetrating trauma to the head and neck (HN) has increased during the past decade in Sweden. This aim of this study was to characterize these injuries and to evaluate the outcome in patients treated at a tertiary trauma centre. METHODS: Swedish trauma registry (SweTrau) data was extracted on patients with HN injuries admitted to Karolinska University Hospital, Stockholm, between 2011 and 2019. Outcome information was extracted from hospital records, with primary endpoints focusing of physiological outcome measures and secondary endpoints on surgical and radiological outcomes. RESULTS: Of 1436 penetrating trauma patients, 329 patients with penetrating HN injuries were identified. 20% (n=66) suffered a gunshot wound (GSW), 73% (n=240) a stab wound (SW), and 7% (n=23) other trauma mechanisms (OTM). The median age for GSW, SW and OTM were 25, 33, and 21, respectively. Assault was primary intent, GSW (81.8%, n=54) and SW (65.8%, n=158). Patients suffering GSWs had severer injuries, worse admission GCS-M and higher intubation rate at the injury site. Most GSW patients underwent major surgery (59.1%) as an initial procedure and more likely had intracranial haemorrhage (ICH) (21.2%). The 30-day mortality: 45.5% (n=30) for GSWs, 5.4% (n=13) for SWs and 0% (n=0) for OTMs. There was a yearly increase in incidence and mortality for GSW and SW. CONCLUSION: Between 2011 and 2019, there was an increasing yearly trend of incidence and mortality from penetrating HN trauma in Stockholm, Sweden. GSW patients suffered more severe injuries, ICHs, and underwent more surgical interventions compared to SW and OTM.

This study investigates 30 lone actors in Sweden with a register-based design using a group of male lone actors and two reference groups: same-sex siblings and other male violent extremists. We compare lone actors to the reference groups along social background, criminal background, and co-offending relations (1995 –2016), and mental health (1980–2016). Our results show that lone actors are primarily born in Sweden to two Swedish-born parents. They have a high degree of criminality and co-offending, indicating that they are not completely loners in their criminal behaviour. They have higher enrolment in secondary education than the reference groups, but lower enrolment in higher education than other male violent extremists. Additionally, they suffer considerably more from mental disorders compared to the reference groups. An analysis of criminality and in- and outpatient hospitalisation over the life course indicates that lone actors may have had problems in their transition into middle age.

While there is a substantial research literature on Western ‘foreign fighters’ – those young men and women from Europe, North America, Australia and elsewhere who traveled to Syria and Iraq, from around 2011–2017, to join jihadist groups engaged in combat – there is a dearth of comparative studies examining the backgrounds of these fighters. National variations in the levels of recruitment have been measured and samples examined to determine the demographics of these fighters, indicating some national variations in who went, how, and maybe why. More fulsome comparative data is needed, however, to detect and measure such differences to gain insight into the factors conditioning the radicalization of these foreign fighters. Calling on original and unique datasets, this study presents the results of a comparative analysis of Canadian and Swedish foreign fighters. In each case the findings are compared with other domestic jihadists as well to delineate if those drawn to fight in Syria and Iraq differ. Clear differences emerge in the basic demographics of these national samples, highlighting some empirical and interpretive issues in need of further analysis.

In recent years, the study of terrorism and violent extremism has increasingly benefited from the use of register data such as population data and judicial data. The use of this type of data brings with it many advantages, such as the ability to study complete populations, to combine different sources of data, and, often, it enables researchers to take on a longitudinal and comparative approach. However, the use of register data also brings with it some significant challenges, in terms of acquiring the data (practical challenges) and in terms of biases in the data (content/ethical challenges). In this paper we discuss the usage of register data in terrorism research, with a focus on the Dutch and Swedish context. Whereas both countries are to some extent similar in that they both have a rich data-infrastructure, differences also exist regarding the type of data, agencies responsible for collecting and distributing the data, and ethical approaches. In the chapter, we will go into the strengths and weaknesses of using register data in research on terrorism and violent extremism. Moreover, we will elaborate on how the use of register data can be improved, what type of research questions can and cannot be answered based on register data, and on potential opportunities of integrating register data into mixed-methods designs.