In this thesis, the relationship between vitamin D and health-related outcomes has been investigated. More than 21,000 individuals participated in the Tromsø Study 2015-16. The participants donated blood samples and filled in questionnaires regarding their health status, including questions about their sleep health. Using these data, the association between vitamin D and sleep duration, daytime ...

<p><i>Bakgrunn:</i> Voksne med utviklingshemming har dårligere fysisk og selvrapportert helse, og mindre tilgang til helsetjenester sammenlignet med generell befolkning. Dette har vært lite undersøkt i Norge. <p><i>Formål:</i> Øke kunnskap om helse og fysisk funksjon hos voksne med utviklingshemming. Undersøke faktorer assosiert med gjennomføring av fysiske funksjonstester, samt fysisk og selvopplevd ...

This doctoral thesis aimed to evaluate the psychometric properties and the practical use of a newly developed self-report personality measure for the Armed Forces, the Norwegian Military Personality Inventory (NMPI). Three published studies contributed to this end. Study 1 explored associations between candidate personality traits and leadership competency ratings at an officer selection program. ...

Anti-doping measures are an essential part of professional sports around the world. Anabolic androgenic steroids have been among the most widely used illicit substance classes since the early days of the fight against doping. The conventional method for analysing these substances is gas chromatography combined with mass spectrometry (GC-MS). This approach is sensitive and selective but also very ...

<p><i>Background/Aims:</i> Molar-Incisor Hypomineralization (MIH) is one of the most common dental developmental disorders with a global prevalence of 13%. The etiology of MIH is still elusive. The aims of this thesis were to report the prevalence of MIH in northern Norway, to investigate a possible association between birth asphyxia and MIH, and to document the effect of antibiotics on the developing ...

High rates of cesarean section are associated with increased mortality and morbidity. To decrease cesarean sections without medical indication is complex and requires in-depth knowledge of local context and which groups to target for possible interventions. Our aim was to assess the role of maternal risk factors in relation to cesarean section in Georgia and Norway, two countries with diverging rates ...

<p><i>Background/Aims:</i> Prostate cancer (PCa) is the most common cancer among men in Norway as well as world-wide, and a major cause of health loss and death with 1.4 million new cases and 375 000 deaths world-wide in 2020. Biological mechanisms involved in PCa development are mainly unknown, but chronic inflammation, one hallmark of cancer development, has been questioned to play a key role in ...

This thesis springs from 3 different papers: Paper 1 A randomised controlled study in rats to investigate whether an infusion of crystalloids or colloids during rewarming from hypothermia could alleviate the alterations in cardiovascular function seen in untreated control animals. Paper 2 A randomised controlled study in pigs, examining normothermic vs hypothermic cardiopulmonary resuscitation (CPR). ...

The levels of sickness absenteeism in Norway are extraordinarily high. One of three employees reports that work is partly or fully the reason why they are absent. Regardless of a clear and explicit political goal to reduce sickness absence, previous reforms in Norway have not had much success. In this dissertation, we collected self-report data from thousands of jobholders and performed cross-sectional ...

Stroke is a leading cause of death and disability worldwide. Approximately 85% of strokes are ischaemic strokes caused by blockage of a brain artery. Recanalisation therapies with thrombolysis (injection of drugs that dissolve the blood clot) and thrombectomy (mechanical removal of the blood clot) have revolutionised acute ischaemic stroke treatment during the last 25 years. Thrombolysis within ...