SJStefan Hrafn Jonsson

Stefan Hrafn Jonsson

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Previous Organizations / Institutes

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Stefan Hrafn Jonsson has a total of 142 co-authors. Here are the top co-authors by number of shared publications:


Latest Publications

  • Open Access

    Perceived Worth of Higher Education Under Scarcity: Evidence from Students in Guinea-Bissau

    by Jon Edmund Bollom, Stefán Hrafn Jónsson, Aladje Baldé, Zeca Jandi, William Gomes Ferreira, Geir Gunnlaugsson, Jónína Einarsdóttir

    Research increasingly examines initial access to higher education (HE) in sub-Saharan Africa, yet less is known about the persistence of enrolled students in fragile contexts where costs are high and outcomes are uncertain. This study provides the first large-scale quantitative analysis of perceived HE worth in Guinea-Bissau, a resource-scarce Lusophone state. Drawing on Human Capital Investment (HCI), Behavioural Economics (BE), and Afrocentric perspectives on resilience and hope, we analysed survey data from 2255 students across six HE institutions (HEIs). A binary indicator of whether HE was worth the cost was used to assess ongoing valuation, and the data were analysed using sequential block-entry logistic regression after multiple imputation. Overall, 30.1% of students did not affirm that HE was worth the cost, indicating that enrolment does not guarantee sustained valuation. While cost-benefit reasoning remains important, perceptions were strongly shaped by campus climate and forward-looking expectations. Perceived advantages of HE, even without completion, outweighed the value of credentials alone, suggesting a pragmatic evaluation. We suggest anticipatory resilience as a lens for understanding students’ sustained valuations of HE amid uncertainty, grounded in anticipated benefits, institutional experience, and relational resources. Policy should prioritise campus climate, reduce financial strain, and reinforce the intrinsic value of HE.

  • Epidemiology of polypharmacy in primary healthcare in the Reykjavik metropolitan area 2010-2019

    by Dagur Andri Fridgeirsson Hjaltalin, Jon Steinar Jonsson, Kristjan Linnet, Emil Larus Sigurdsson, Anna Bryndis Blondal

    INTRODUCTION: Taking medicines can induce risks leading to negative health issues that can grow in accordance with the number of medicines used. Many studies on the prevalence of polypharmacy have been carried out in other countries, but such studies are lacking in Iceland. The aim of this study was to analyse the prevalence of polypharmacy in primary care in the Reykjavik metropolitan area. METHODS: The study population consisted of individuals who had been prescribed five or more drugs by physicians in primary care in the Reykjavik metropolitan area during the study period. Data was collected on all drug prescriptions for individuals in the area. Those who had five or more drugs prescribed in the primary healthcare database from 1 January 2010 through 31 December 2019 were included in the study. According to Statistics Iceland, the total number of inhabitants in the area was 200.907 in 2010 and 228.222 in 2019. FINDINGS: The prevalence of polypharmacy increased gradually in 2010-2019, or by 37.9% during this period. Patients with polypharmacy were 9.8% (19.778) at the beginning of the study in 2010 and increased to 13.6% (30.970) in 2019. A clear association was observed between age and polypharmacy, and the study showed polypharmacy to be more common among women. The study findings revealed that the greatest relative increase in polypharmacy was among young people from 20-49 years of age. ATC class analysis showed a sharp increase in the first and third levels of the ATC subgroups. CONCLUSION: The findings suggest polypharmacy to be common in the Reykjavik metropolitan area. Similarly, its prevalence seems to be increasing in younger patients. It is important to gain a better understanding of the reasons for the development of polypharmacy and evaluate the increasing medicalisation in society. The underlying reasons, as well as the effects of polypharmacy, can lead to both positive and negative health outcomes.

  • Resistant hypertension – pheochromocytoma

    by Krister Blær Jónsson, Eiríkur Orri Guðmundsson, Margrét Sigurðardóttir, Jón Jóhannes Jónsson, Helga Ágústa Sigurjónsdóttir

    We report a case of a man with a 30-year history of treatment-resistant hypertension, hydropoiesis, tachycardic spells and dysgeusia. Despite repeated visits to the emergency department and work-up in an out-patient clinic, the diagnosis was unknown. Three years prior to remittance to an endocrinologist, the hypertension worsened, and he developed diabetes type-II. Further work-up revealed a 3 cm extra-adrenal pheochromocytoma, a paraganglioma. After surgical removal of the tumor, he is without medication and symptom free. Pheochromocytoma and paraganglioma are rare causes of hypertension, estimated to explain 0.1-0.6% of all cases, but nonetheless an important diagnosis to make, due to serious side effects.


  • Liver surgeries in Iceland 2013-2017 – Comparison with Sweden in terms of quality registration

    by Rakel Hekla Sigurðardóttir, Helgi Birgisson, Icelandic Cancer Registry, Jón Gunnlaugur Jónasson, Kristín Huld Haraldsdóttir

    INTRODUCTION: Cancers in the liver, bile duct system, gallbladder as well as metastases of the liver, have poor prognosis. Their treatment is comparable, with surgery being the most widespread, available curative treatment. Surgical treatment is anatomical or non-anatomical resection of the liver where the tumor and the adjacent liver tissue are removed. MATERIALS/METHODS: A list of patients diagnosed with cancer in the liver, bile duct system, gallbladder or metastases of the liver, during the time period 2013-2017, was obtained from the Icelandic Cancer Registry. Additional information was retrieved from medical records and entered into the electronic quality registration forms of Landspítalinn. A comparison was made between Sweden and Iceland. RESULTS: In total 108 patients were diagnosed with primary cancer of the liver, of which 24 (22%) underwent liver surgery. Of 264 diagnosed with liver metastases 38 (14%) underwent surgical treatment. A total of 63% of all reported cases were discussed at a multidisciplinary team meeting in Iceland but 93% in Sweden (p<0.0001). A sum of 29 patients (43%) developed complications within 30 days of surgery. Number of partial liver resections per 100.000 inhabitants were 2-8 in Iceland versus 4-13 in Sweden. The difference was even more apparent in patients with liver metastases. CONCLUSION: Liver surgeries performed in Iceland seem to be comparable to Sweden in terms of complications and post operative mortality. In Iceland, considerably fewer operations are performed per capita, especially on liver metastases which could be explained by the fact that fewer patients are discussed at multidisciplinary team meetings.

  • Hypertension Management in Primary Care in the Capital Area of Iceland

    by Stefán Júlíus Aðalsteinsson, Jón Steinar Jónsson, Hannes Hrafnkelsson, Guðmundur Þorgeirsson, Emil Lárus Sigurðsson

    INTRODUCTION: High blood pressure (HT) is one of the main risk factors for cardiovascular diseases which in 2010 caused one third of all mortality in the world. Untreated, HT can cause stroke, myocardial infarction, heart failure, dementia, kidney failure, atherosclerosis and eye diseases. The main aim of this study was to find out how HT is treated in primary care in the capital area of Iceland. MATERIAL AND METHODS: The study is a descriptive retrospective cross-sectional study covering the years 2010, 2014 and 2019. Information about all patients over 18 years old diagnosed with HT were gathered from computerised medical records at every primary care center in the Capital area. RESULTS: The number of individuals diagnosed with HT increased during the study period and the mean age did also increase. The sex ratio changed with more men diagnosed than women. Of 25.873 patients diagnosed with HT in the year 2010, 63.4% received drug treatment. In 2019 this percentage had dropped 60.9% (p<0.001). Of those on antihypertensive drug treatment the proportion receiving one, two or three drugs remained same from 2010-2019. The most common group of drugs used were diuretics (C03), beta-blockers (C07), calcium channel blockers (C08) and renin-angiotensin-aldosteron-system (RAAS) inhibitors (C09). The proportion af these drug groups changed significantly during the study. Fever patients were treated by diuretics (p<0.001) or beta-blockers (p<0.001) but the number treated by calcium channel blockers (p<0.001) or RAAS inhibitors increased (p<0.001). During the whole stud period 44.1% of the patients reached the target goals. The proportion of patients who reached the target goals in different health care center was specifically for the year 2019. Just over 41% of HT patients reached the targets goals. However, two health care centers achieved notably different results with only one third of the patients attaining the goals. CONCLUSION: As has recently been shown in epidemiologic studies hypertension in Iceland is both underdiagnosed and undertreated although the country ranks high on both counts in international comparison. Furthermore, the fact that under half of hypertensive patients in general practice in the capital area reach the targeted treatment goals, cannot be considered an acceptable. Thus, it is of immense importance to improve both the diagnosis and the treatment of HT.

  • Advances in lung cancer diagnosis and treatment - a review

    by Hrönn Harðardóttir, Steinn Jónsson, Örvar Gunnarsson, Bylgja Hilmarsdóttir, Jurate Ásmundsson, Ingibjörg Guðmundsdóttir, Vaka Ýr Sævarsdóttir, Sif Hansdóttir, Pétur Hannesson, Tómas Guðbjartsson

    Lung cancer is the second and third most common cancer in Iceland for females and males, respectively. Although the incidence is declining, lung cancer still has the highest mortality of all cancers in Iceland. Symptoms of lung cancer can be specific and localized to the lungs, but more commonly they are unspecific and result in significant diagnostic delay. Therefore, majority of lung cancer patients are diagnosed with non-localized disease. In recent years, major developments have been made in the diagnosis and treatment of lung cancer. Positive emission scanning (PET) and both transbroncial (EBUS) or transesophageal ultrasound (EUS) biopsy techniques have resulted in improved mediastinal staging of the disease and minimal invasive video-assisted thoracic surgery (VATS) has lowered postoperative complications and shortened hospital stay. Technical developments in radiotherapy have benefitted those patients who are not candidates for curative surgery. Finally, and most importantly, recent advances in targeted chemotherapeutics and development of immunomodulating agents have made individual tailoring of treatment possible. Recent screening-trials with low-dose computed tomography show promising results in lowering mortality. This evidence-based review focuses on the most important developments in the diagnosis and treatment of lung cancer, and includes Icelandic studies in the field.


  • Increased use of genetic health care in Iceland 2012-2017

    by Hákon Björn Högnason, Vigdís Fjóla Stefánsdóttir, Eirný Þöll Þórólfsdóttir, Jón Jóhannes Jónsson, Hans Tómas Björnsson

    INTRODUCTION: A genetic counselling unit at Landspitali hospital (LSH) was established in 2006. Meanwhile, genetic testing has become an integral part of general health care. In this article we detail the outcome of genetic testing at the Department of Genetic and Molecular Medicine (DGM) at Landspitali over a five year period (2012-2017). Factors that were analyzed for the time period were: Number of patients, reason for referral, reason for genetic testing without genetic counselling and yield (proportion of positive tests) of genetic testing. METHODS: Data was analysed from two medical record databases, Shire and Saga, used by the DGM in the time period. RESULTS: The number of individuals coming for genetic counselling increased every year over the time period. Reasons for referral were cancer-related in two-thirds of cases. Other reasons for referral included various other familial disorders. Most common were autosomal dominant disorders like myotonic dystrophy, hypertrophic cardiomyopathy and autosomal recessive disorders like spinal muscular atrophy (SMA) and GM1-gangliosidosis. Most common reasons for genetic testing outside of the LSH GC unit was because of managable diseases like hemochromatosis and F5/Prothrombin-related thrombophilia. Yield of genetic testing was assessed for a) known mutation testing / carrier testing, b) single gene testing, c) gene panel testing and d) whole genome and whole exome sequencing. Known mutation testing was positive in 33% of cases and single gene testing in 46% of cases. The yield of gene panel testing for cancer was found to be lower (20%) than gene panel testing for other disorders (40%). The yield of whole exome and whole genome sequencing was 46%.

  • Factors affecting general practitioners’ choice of drug therapy: A study in primary healthcare in Iceland

    by Yrsa Ívarsdóttir, Jón Steinar Jónsson, Kristján Linnet, Anna Bryndís Blöndal

    Introduction: This study aimed to analyse several factors that influence the decision-making of primary care physicians in Iceland in their choice of drug therapy for their patients. Also, to find which factors can act as a hindrance in making the best choices. Finally, to analyse which elements could be most important in facilitating decisions. Material and methods: A questionnaire was sent by e-mail to physicians working in primary care in Iceland. The questionnaire comprised closed questions, open text boxes, and ranking questions. The data was processed and analysed using Microsoft Excel. Results: The total number of primary care physicians who responded to the questionnaire was 93, a response rate of 40.7% of all the primary care physicians. The results reveal that physicians working in primary care consider clinical guidelines, the Icelandic National Formulary, and personal experience to be the most important factors when choosing a medication. Primary care physicians strongly agree that the lack of drug interaction software connected to medical records is a shortcoming. The most important factors that need improvement to facilitate primary care physicians' decision-making are drug formularies and interaction software. Conclusion: The results suggest some factors that support physicians in primary care in making decisions when choosing drug therapy, such as a drug formulary, drug interaction software, information about patients’ drug therapy, variable length in face-to-face consultations, evidence based information on new drugs, and counselling provided by clinical pharmacists.

  • Changes in prescriptions on opioids in primary health care during the years 2008-2017

    by Sigríður Óladóttir, Jón Steinar Jónsson, Margrét Ólafía Tómasdóttir, Hannes Hrafnkelsson, Emil Lárus Sigurðsson

    INTRODUCTION: In recent decades there has been a notable increase in the prescription of opioids in western countries. With this rise in use of opioids the risk of side effects, opioid abuse and deaths linked to opioids have become more apparent. The increase in opioid prescription may partly stem from a change in attitude in relation to pain management. Research has shown that pain is among the most common reasons people seek medical care and chronic pain is prevalent. Iceland is leading the Nordic countries in opioid prescriptions. OBJECTIVE: To examine prescriptions of opioids in primary car in Iceland for all age group from 2008 to 2017. METHODS: The research included all opioid prescription in every health clinic in the capital area in Iceland the between 2008 and 2017. Population in the capital area in this time period was between 201 and 222 thousand people. Data was collected from medical records database of the primary health care and approximatley 68.000 individuals had received a prescription for opioids during the research period. RESULTS: During the research period there was a 17,2% (p<0,01) increase in DDD/1000 inhabitants/day (Defined daily dose) for opioids. About a third of those who got the prescription were men and that ratio did not change during the period. proportionately, the biggest change in DDD/1000 inhabitants/day was in the age group made of people 90 years old and older, about 40,5% (p<0,01). The biggest increase in number of people getting a prescription for opioids was in the age group 30-39, about 25,5% (p<0,01). Number of prescriptions increased in every category of opioids, measured in DDD/1000 inhabitants/day,15,3% (p<0,01) in parkódin, 20,7% (p<0,01) in parkódín forte, 4,7% (p<0,01) in tramadol and 85,6% (p<0,01) in the strongest opioids. Discussion: the evolution of prescriptions for every type of opioid to the clients of the health clinics in the capital area that occured in the years from 2008 to 2017, proportionately highest for the strongest opioids, should encourage a review of pain treatment within the health clinics and development within that field.


  • Is internal migration declining in Iceland? Intensities, geographical patterns and population composition 1986–2017

    by Ólöf Garðarsdóttir, Thoroddur Bjarnason, Stefán Hrafn Jónsson, Ian Shuttleworth

    The Nordic countries have higher rates of internal migration than most other Western societies and have not always shared in the declines noted in other countries. This paper examines migration in Iceland during the period 1986–2017 to add to the wider international literature on migration trends. Compared with its Nordic neighbours, Iceland has the highest rates of internal migration and currently also the greatest porosity in terms of international inflows and outflows. The main focus is on migration flows between the Reykjavík capital area—the only city in the country—the nearby exurban regions on the one hand and the more distant provinces at the other hand. We show that, despite continued high aggregate migration rates, there has been a slight but long‐term downward trend in all moves. We also indicate that migration rates are highly sensitive to cyclic economic fluctuations. Migration between the Reykjavík capital area and its surrounding exurban regions is characterised by increasing mobility during economic booms but the Great Recession starting in 2008 led to a fall in migration. However, the slight decline in overall internal migration in Iceland since the 1990s can almost exclusively be attributed to the decline in migration from the provinces to the Reykjavík capital area, which predates the 2008 Great Recession.