Now showing items 1-16 of 16

  • Kendler, Kenneth S.; Aggen, Steven H.; Gillespie, Nathan; Czajkowski, Nikolai Olavi; Ystrøm, Eivind; Reichborn-Kjennerud, Ted (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    While snus has been the focus of increasing public health interest, twin studies have examined neither sources of individual variation for its use nor the sources of resemblance between snus and cigarette use. Twins from ...
  • Ulset, Vidar; Czajkowski, Nikolai Olavi; Kraft, Brage; Kraft, Pål; Wikenius, Ellen; Kleppestø, Thomas Haarklau; Bekkhus, Mona (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    Social stress and inflammatory processes are strong regulators of one another. Considerable evidence shows that social threats trigger inflammatory responses that increase infection susceptibility in both humans and animals, ...
  • Kleppestø, Thomas Haarklau; Czajkowski, Nikolai Olavi; Vassend, Olav; Røysamb, Espen; Eftedal, Nikolai Haahjem; Sheehy-Skeffington, Jennifer; Kunst, Jonas R.; Thomsen, Lotte (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2019)
    A foundational question in the social sciences concerns the interplay of underlying causes in the formation of people’s political beliefs and prejudices. What role, if any, do genes, environmental influences, or personality ...
  • Glad, Kristin Alve; Czajkowski, Nikolai Olavi; Dyb, Grete; Hafstad, Gertrud Sofie (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2020)
    Numerous cross-sectional studies have found a positive association between level of event centrality and symptoms of posttraumatic stress disorder (PTSD), but the temporal course of this relationship is unclear. We aimed ...
  • Gjerdevik, Miriam; Gjessing, Håkon K.; Romanowska, Julia; Haaland, Øystein Ariansen; Jugessur, Astanand; Czajkowski, Nikolai Olavi; Lie, Rolv T. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2020)
    Selecting the best design for genetic association studies requires careful deliberation; different study designs can be used to scan for different genetic effects, and each design has its own set of strengths and limitations. ...
  • Østby, Kristian Amundsen; Czajkowski, Nikolai Olavi; Knudsen, Gun Peggy; Ystrøm, Eivind; Gjerde, Line C.; Kendler, Kenneth S.; Ørstavik, Ragnhild; Reichborn-Kjennerud, Ted (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    Background Results from observational studies suggest that people who drink little or no alcohol are less healthy than medium drinkers. This has been demonstrated for many different measures of health, including sick leave. ...
  • Vassend, Olav; Røysamb, Espen; Nielsen, Christopher Sivert; Czajkowski, Nikolai Olavi (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Background: The nature of the relationship between fatigue and its risk factors is poorly understood. In the present study the genetic and environmental association between anxiety-depression, musculoskeletal (MS) pain and ...
  • Røysamb, Espen; Nes, Ragnhild Bang; Czajkowski, Nikolai Olavi; Vassend, Olav (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Human wellbeing is influenced by personality traits, in particular neuroticism and extraversion. Little is known about which facets that drive these associations, and the role of genes and environments. Our aim was to ...
  • Rosenström, Tom Henrik; Gjerde, Line C.; Krueger, Robert Frederick; Aggen, Steven H.; Czajkowski, Nikolai Olavi; Gillespie, Nathan A.; Kendler, Kenneth S.; Reichborn-Kjennerud, Ted; Torvik, Fartein Ask; Ystrøm, Eivind (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Background: Normative and pathological personality traits have rarely been integrated into a joint large-scale structural analysis with psychiatric disorders, although a recent study suggested they entail a common individual ...
  • Eilertsen, Espen Moen; Gjerde, Line C.; Reichborn-Kjennerud, Ted; Ørstavik, Ragnhild; Knudsen, Gun Peggy; Stoltenberg, Camilla; Czajkowski, Nikolai Olavi; Røysamb, Espen; Kendler, Kenneth S; Ystrøm, Eivind (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    Background Maternal alcohol use during pregnancy has repeatedly been associated with development of attention-deficit hyperactivity disorder (ADHD) in the offspring. It is, however not known whether this reflects a ...
  • Nilsen, Thomas Sevenius; Brandt, Ingunn; Czajkowski, Nikolai Olavi; Knudsen, Gun Peggy; Magnus, Per; Reichborn-Kjennerud, Ted; Tambs, Kristian; Harris, Jennifer; Ørstavik, Ragnhild (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2016)
    The Norwegian Twin Registry (NTR) is a large population based twin cohort for research purposes. At present, the registry has 14 692 complete twin pairs with information on zygosity and to varying degree information on ...
  • Fu, Susie; Czajkowski, Nikolai Olavi; Rund, Bjørn Rishovd; Torgalsbøen, Anne-Kari (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2017)
    Although cognitive impairments are consistently linked to functional outcome in chronic schizophrenia, the relationship remains unclear for patients with first-episode schizophrenia. The objective of this present study was ...
  • Torgalsbøen, Anne-Kari; Fu, Susie; Czajkowski, Nikolai Olavi (Journal article / Tidsskriftartikkel / AcceptedVersion; Peer reviewed, 2018)
    Background: Resilience is successful adaptation despite adversity. This personality trait has the potential to add new knowledge to how to achieve a successful outcome, but resilience has been understudied in schizophrenia. ...
  • Torvik, Fartein Ask; Ystrøm, Eivind; Czajkowski, Nikolai Olavi; Tambs, Kristian; Røysamb, Espen; Ørstavik, Ragnhild; Knudsen, Gun Peggy; Kendler, Kenneth S; Reichborn-Kjennerud, Ted (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2015)
    Background Low socioeconomic status (SES), indicated by low income and education, has consistently been found to be a strong predictor of sick leave. Several possible pathways from SES to sick leave have been described in ...
  • Torvik, Fartein Ask; Rosenström, Tom Henrik; Ystrøm, Eivind; Tambs, Kristian; Røysamb, Espen; Czajkowski, Nikolai Olavi; Gillespie, Nathan; Knudsen, Gun Peggy; Kendler, Kenneth S.; Reichborn-Kjennerud, Ted (Journal article / Tidsskriftartikkel / SubmittedVersion, 2017)
    Alcohol use disorder (AUD) and major depressive disorder (MDD) are often comorbid. It is not understood how genetic risk factors for these disorders relate to each other over time and to what degree they are stable. ...
  • Gillespie, Nathan A.; Aggen, Steven H.; Gentry, Amanda E.; Neale, Michael Churton; Knudsen, Gun Peggy S.; Krueger, Robert Frederick; South, Susan Carol; Czajkowski, Nikolai Olavi; Nesvåg, Ragnar; Ystrøm, Eivind; Rosenström, Tom Henrik; Torvik, Fartein Ask; Reichborn-Kjennerud, Ted; Kendler, Kenneth Seedman (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)
    Until now, data have not been available to elucidate the genetic and environmental sources of comorbidity between all 10 DSM-IV personality disorders (PDs) and cocaine use. Our aim was to determine which PD traits are ...