Nikolai Olavi Czajkowski

Associate Professor
Image of Nikolai Olavi Czajkowski
Norwegian version of this page
Phone +47-22845163
Room S03-07
Available hours By agreement
Username
Visiting address Forskningsveien 3A Harald Schjelderups hus 0373 Oslo
Postal address Psykologisk institutt Postboks 1094 Blindern 0317 Oslo
Tags: Methodology, Personality psychology

Publications

  • Kleppestø, Thomas Haarklau; Czajkowski, Nikolai Olavi; Sheehy-Skeffington, Jennifer; Vassend, Olav Mandt; Røysamb, Espen & Eftedal, Nikolai Haahjem [Show all 9 contributors for this article] (2024). The genetic underpinnings of right-wing authoritarianism and social dominance orientation explain political attitudes beyond Big Five personality. Journal of Personality. ISSN 0022-3506. doi: 10.1111/jopy.12921.
  • Bjørndal, Ludvig Daae; Ebrahimi, Omid V.; Røysamb, Espen; Karstoft, Karen-Inge; Czajkowski, Nikolai Olavi & Nes, Ragnhild Bang (2024). Stressful life events exhibit complex patterns of associations with depressive symptoms in two population-based samples using network analysis. Journal of Affective Disorders. ISSN 0165-0327. 349, p. 569–576. doi: 10.1016/j.jad.2024.01.054.
  • Kozlowski Mayerhofer, Lilian Juliane; Nes, Ragnhild Bang; Lan, Xiaoyu; Czajkowski, Nikolai Olavi; Ystrøm, Eivind & Røysamb, Espen (2023). Wellbeing and illbeing in women exposed to physical and sexual violence: A population based longitudinal study. OSF Preprints.
  • Ebad Fardzadeh, Haghish; Nes, Ragnhild Bang; Obaidi, Milan; Qin, Ping; Stänicke, Line Indrevoll & Bekkhus, Mona [Show all 8 contributors for this article] (2023). Unveiling Adolescent Suicidality: Holistic Analysis of Protective and Risk Factors Using Multiple Machine Learning Algorithms. Journal of Youth and Adolescence. ISSN 0047-2891. 53, p. 507–525. doi: 10.1007/s10964-023-01892-6. Full text in Research Archive
  • Tsotsi, Stella; Goh, Shaun; Coplan, Robert J.; Bølstad, Evalill; Czajkowski, Nikolai Olavi & Smajlagic, Dinka [Show all 7 contributors for this article] (2023). Co-occurrence of internalizing difficulties and aggression in early childhood and risk of mental health problems in middle childhood. International Journal of Behavioral Development. ISSN 0165-0254. 47(5), p. 384–396. doi: 10.1177/01650254231187902. Full text in Research Archive
  • Ebad Fardzadeh, Haghish; Czajkowski, Nikolai Olavi & von Soest, Tilmann Martin (2023). Predicting suicide attempts among Norwegian adolescents without using suicide-related items: a machine learning approach. Frontiers in Psychiatry. ISSN 1664-0640. 14. doi: 10.3389/fpsyt.2023.1216791.
  • Ebad Fardzadeh, Haghish & Czajkowski, Nikolai Olavi (2023). Reconsidering False Positives in Machine Learning Binary Classification Models of Suicidal Behavior. Current Psychology. ISSN 1046-1310. doi: 10.1007/s12144-023-05174-z. Full text in Research Archive
  • Ebad Fardzadeh, Haghish; Laeng, Bruno & Czajkowski, Nikolai Olavi (2023). Are false positives in suicide classification models a risk group? Evidence for “true alarms” in a population-representative longitudinal study of Norwegian adolescents. Frontiers in Psychology. ISSN 1664-1078. 14. doi: 10.3389/fpsyg.2023.1216483. Full text in Research Archive
  • Tesli, Martin Steen; Nesvåg, Ragnar; Haukvik, Unn Kristin Hansen; Gustavson, Kristin; Tesli, Natalia & Friestad, Christine [Show all 12 contributors for this article] (2023). Common genetic and environmental risk for personality disorders and psychotic-like experiences in young adult twins. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 148(6), p. 561–569. doi: 10.1111/acps.13596. Full text in Research Archive
  • Torgalsbøen, Anne Kari; Mohn, Christine; Larøi, Frank; Fu, Susie & Czajkowski, Nikolai Olavi (2023). A ten-year longitudinal repeated assessment study of cognitive improvement in patients with first-episode schizophrenia and healthy controls: The Oslo Schizophrenia Recovery (OSR) study. Schizophrenia Research. ISSN 0920-9964. 260, p. 92–98. doi: 10.1016/j.schres.2023.08.008. Full text in Research Archive
  • Bjørndal, Ludvig Daae; Nes, Ragnhild Bang; Czajkowski, Nikolai Olavi & Røysamb, Espen (2023). The structure of well-being: a single underlying factor with genetic and environmental influences. Quality of Life Research. ISSN 0962-9343. 32, p. 2805–2816. doi: 10.1007/s11136-023-03437-7.
  • Rosenström, Tom H.; Czajkowski, Nikolai Olavi; Solbakken, Ole Andre & Saarni, Suoma E. (2023). Direction of dependence analysis for pre-post assessments using non-Gaussian methods: a tutorial. Psychotherapy Research. ISSN 1050-3307. doi: 10.1080/10503307.2023.2167526.
  • Mylläri, Sanna; Saarni, Suoma Eeva; Ritola, Ville; Joffe, Grigori; Stenberg, Jan-Henry & Solbakken, Ole Andre [Show all 8 contributors for this article] (2022). Text Topics and Treatment Response in Internet-Delivered Cognitive Behavioral Therapy for Generalized Anxiety Disorder: Text Mining Study. Journal of Medical Internet Research. ISSN 1438-8871. 24(11). doi: 10.2196/38911.
  • Oftedal, Aurora; Bekkhus, Mona; Haugen, Guttorm Nils; Hjemdal, Odin; Czajkowski, Nikolai Olavi & Kaasen, Anne (2022). Long-Term Impact of Diagnosed Fetal Anomaly on Parental Traumatic Stress, Resilience, and Relationship Satisfaction. Journal of Pediatric Psychology. ISSN 0146-8693. 48(2), p. 181–192. doi: 10.1093/jpepsy/jsac085. Full text in Research Archive
  • Waraan, Luxsiya; Siqveland, Johan; Hanssen-Bauer, Ketil; Czajkowski, Nikolai Olavi; Axelsdottir, Brynhildur & Mehlum, Lars [Show all 7 contributors for this article] (2022). Family therapy for adolescents with depression and suicidal ideation: A systematic review and meta–analysis. Clinical Child Psychology and Psychiatry. ISSN 1359-1045. p. 1–19. doi: 10.1177/13591045221125005. Full text in Research Archive
  • Oftedal, Aurora; Bekkhus, Mona; Haugen, Guttorm Nils; Czajkowski, Nikolai Olavi & Kaasen, Anne (2022). The impact of diagnosed fetal anomaly, diagnostic severity and prognostic ambiguity on parental depression and traumatic stress: a prospective longitudinal cohort study. Acta Obstetricia et Gynecologica Scandinavica. ISSN 0001-6349. 101(11), p. 1291–1299. doi: 10.1111/aogs.14453. Full text in Research Archive
  • Kendler, Kenneth S.; Czajkowski, Nikolai Olavi & Reichborn-Kjennerud, Ted (2022). Ludvig Dahl's psychiatric genetic studies in his 1859 monograph: “Contribution to the knowledge of insanity in Norway”. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics. ISSN 1552-4841. 189(6), p. 177–184. doi: 10.1002/ajmg.b.32914. Full text in Research Archive
  • Skaug, Eirunn; Czajkowski, Nikolai Olavi; Waaktaar, Trine & Torgersen, Svenn (2022). The role of sense of coherence and loneliness in borderline personality disorder traits: a longitudinal twin study. Borderline personality disorder and emotion dysregulation (BPDED). ISSN 2051-6673. 9. doi: 10.1186/s40479-022-00190-0. Full text in Research Archive
  • Skaug, Eirunn; Czajkowski, Nikolai Olavi; Waaktaar, Trine & Torgersen, Svenn (2022). The relationship between life events and sense of coherence in adolescence. A longitudinal twin study. Journal of Research in Personality. ISSN 0092-6566. 99. doi: 10.1016/j.jrp.2022.104259. Full text in Research Archive
  • Skaug, Eirunn; Czajkowski, Nikolai Olavi; Waaktaar, Trine & Torgersen, Svenn (2022). Childhood Trauma and Borderline Personality Disorder Traits: A Discordant Twin Study. Journal of Psychopathology and Clinical Science. ISSN 2769-7541. 131(4), p. 365–374. doi: 10.1037/abn0000755.
  • Vassend, Olav Mandt; Czajkowski, Nikolai Olavi; Røysamb, Espen & Nielsen, Christopher Sivert (2022). The role of neuroticism and pain in dental anxiety: A twin study. Community Dentistry and Oral Epidemiology. ISSN 0301-5661. doi: 10.1111/cdoe.12763. Full text in Research Archive
  • Eftedal, Nikolai Haahjem; Kleppestø, Thomas Haarklau; Czajkowski, Nikolai Olavi; Sheehy-Skeffington, Jennifer; Røysamb, Espen & Vassend, Olav Mandt [Show all 8 contributors for this article] (2022). Justice sensitivity is undergirded by separate heritable motivations to be morally principled and opportunistic. Scientific Reports. ISSN 2045-2322. 12. doi: 10.1038/s41598-022-09253-2. Full text in Research Archive
  • Sælid, Gry Anette; Czajkowski, Nikolai Olavi; Aarø, Leif Edvard; Andersen, John Roger; Idsøe, Thormod & Helleseter, Miguel Delgado [Show all 7 contributors for this article] (2022). Effects of a school-based intervention on levels of anxiety and depression: a cluster-randomized controlled trial of the MindPower program in ten high schools in Norway. BMC Psychology. ISSN 2050-7283. 10, p. 1–14. doi: 10.1186/s40359-022-00721-y. Full text in Research Archive
  • Waraan, Luxsiya; Mehlum, Lars; Rognli, Erling W.; Czajkowski, Nikolai Olavi & Villabø, Marianne (2021). Associations between insecure attachment styles to parents and suicidal ideation in adolescents with depression . Scandinavian Journal of Child and Adolescent Psychiatry and Psychology. ISSN 2245-8875. 9, p. 41–51. doi: 10.21307/sjcapp-2021-006. Full text in Research Archive
  • Glad, Kristin Alve; Stensland, Synne; Czajkowski, Nikolai Olavi; Boelen, Paul & Dyb, Grete Anita (2021). The Longitudinal Association Between Symptoms of Posttraumatic Stress and Complicated Grief: A Random Intercepts Cross-Lag Analysis. Psychological Trauma. ISSN 1942-9681. doi: 10.1037/tra0001087. Full text in Research Archive
  • Waraan, Luxsiya; Rognli, Erling W.; Czajkowski, Nikolai Olavi; Villabø, Marianne & Mehlum, Lars (2021). Effectiveness of attachment-based family therapy compared to treatment as usual for depressed adolescents in community mental health clinics. Child and Adolescent Psychiatry and Mental Health (CAPMH). ISSN 1753-2000. 15, p. 1–14. doi: 10.1186/s13034-021-00361-x. Full text in Research Archive
  • Askim, Kine; Czajkowski, Nikolai Olavi & Knardahl, Stein (2021). Exploring dynamic relationships between employees’ personalities and psychosocial work factors. European Journal of Work and Organizational Psychology. ISSN 1359-432X. 31(1). doi: 10.1080/1359432X.2021.1912016.
  • Ulset, Vidar; Czajkowski, Nikolai Olavi; Staton, Sally; Smith, Simon C.; Pattinson, Cassandra & Allen, Alicia [Show all 8 contributors for this article] (2021). Environmental Light Exposure, Rest-Activity Rhythms, and Symptoms of Inattention and Hyperactivity: An Observational Study of Australian Preschoolers. Journal of Environmental Psychology. ISSN 0272-4944. doi: 10.1016/j.jenvp.2021.101560.
  • Waraan, Luxsiya; Rognli, Erling W.; Czajkowski, Nikolai Olavi; Mehlum, Lars & Villabø, Marianne (2020). Efficacy of attachment-based family therapy compared to treatment as usual for suicidal ideation in adolescents with MDD. Clinical Child Psychology and Psychiatry. ISSN 1359-1045. doi: 10.1177/1359104520980776. Full text in Research Archive
  • Czajkowski, Nikolai Olavi; Kendler, Kenneth S; Torvik, Fartein Ask; Ystrøm, Eivind; Rosenström, Tom Henrik & Gillespie, Nathan [Show all 7 contributors for this article] (2020). Caffeine consumption, toxicity, tolerance and withdrawal; shared genetic influences with normative personality and personality disorder traits. Experimental and clinical psychopharmacology. ISSN 1064-1297. doi: 10.1037/pha0000429. Full text in Research Archive
  • Rognli, Erling W.; Aalberg, Marianne & Czajkowski, Nikolai Olavi (2020). Using informant discrepancies in report of parent–adolescent conflict to predict hopelessness in adolescent depression. Clinical Child Psychology and Psychiatry. ISSN 1359-1045. 26(1), p. 96–109. doi: 10.1177/1359104520969761. Full text in Research Archive
  • Rognli, Erling W.; Waraan, Luxsiya; Czajkowski, Nikolai Olavi & Villabø, Marianne (2020). Moderation of treatment effects by parent-adolescent conflict in a randomised controlled trial of Attachment-Based Family Therapy for adolescent depression. Scandinavian Journal of Child and Adolescent Psychiatry and Psychology. ISSN 2245-8875. 8, p. 110–122. doi: 10.21307/sjcapp-2020-011. Full text in Research Archive
  • Eilertsen, Espen Moen; Hannigan, Laurie John; McAdams, Tom A.; Rijsdijk, Frühling V.; Czajkowski, Nikolai Olavi & Reichborn-Kjennerud, Ted [Show all 8 contributors for this article] (2020). Parental Prenatal Symptoms of Depression and Offspring Symptoms of ADHD: A Genetically Informed Intergenerational Study. Journal of Attention Disorders. ISSN 1087-0547. doi: 10.1177/1087054720914386. Full text in Research Archive
  • Rosenström, Tom Henrik; Torvik, Fartein Ask; Ystrøm, Eivind; Aggen, Steven H.; Gillespie, Nathan A. & Krueger, Robert F. [Show all 9 contributors for this article] (2020). Specific Antisocial and Borderline Personality Disorder Criteria and General Substance Use: A Twin Study. Personality Disorders: Theory, Research, and Treatment. ISSN 1949-2715. 12(3), p. 228–240. doi: 10.1037/per0000404. Full text in Research Archive
  • Liu, Hang; Laeng, Bruno & Czajkowski, Nikolai Olavi (2020). Does stereopsis improve face identification? A study using a virtual reality display with integrated eye-tracking and pupillometry. Acta Psychologica. ISSN 0001-6918. 210. doi: 10.1016/j.actpsy.2020.103142. Full text in Research Archive
  • Glad, Kristin Alve; Czajkowski, Nikolai Olavi; Dyb, Grete & Hafstad, Gertrud Sofie (2020). Does event centrality mediate the effect of peritraumatic reactions on post-traumatic growth in survivors of a terrorist attack? European Journal of Psychotraumatology. ISSN 2000-8066. 11(1). doi: 10.1080/20008198.2020.1766276. Full text in Research Archive
  • Haukeland, Yngvild; Czajkowski, Nikolai Olavi; Fjermestad, Krister; Silverman, Wendy K.; Mossige, Svein & Vatne, Torun (2020). Evaluation of “SIBS”, An Intervention for Siblings and Parents of Children with Chronic Disorders. Journal of Child and Family Studies. ISSN 1062-1024. 29. doi: 10.1007/s10826-020-01737-x. Full text in Research Archive
  • Siegel, Marte Langenes; Binder, Eva Mathilde Gullestad; Dahl, Hanne-Sofie Johnsen ; Czajkowski, Nikolai Olavi; Critchfield, Kenneth L. & Høglend, Per Andreas [Show all 7 contributors for this article] (2020). Therapeutic Atmosphere in Psychotherapy Sessions. International Journal of Environmental Research and Public Health (IJERPH). ISSN 1661-7827. 17(11). doi: 10.3390/ijerph17114105. Full text in Research Archive
  • Gjerdevik, Miriam; Gjessing, Håkon K.; Romanowska, Julia; Haaland, Øystein Ariansen; Jugessur, Astanand & Czajkowski, Nikolai Olavi [Show all 7 contributors for this article] (2020). Design efficiency in genetic association studies. Statistics in Medicine. ISSN 0277-6715. 39, p. 1292–1310. doi: 10.1002/sim.8476. Full text in Research Archive
  • Rognli, Erling Wright; Waraan, Luxsiya; Czajkowski, Nikolai Olavi; Solbakken, Ole Andre & Aalberg, Marianne (2020). Conflict with Parents in Adolescent Depression: Associations with Parental Interpersonal Problems and Depressive Symptoms. Child Psychiatry and Human Development. ISSN 0009-398X. 51, p. 442–452. doi: 10.1007/s10578-020-00955-0. Full text in Research Archive
  • Kleppestø, Thomas Haarklau; Czajkowski, Nikolai Olavi; Vassend, Olav; Røysamb, Espen; Eftedal, Nikolai Haahjem & Sheehy-Skeffington, Jennifer [Show all 8 contributors for this article] (2019). Correlations between social dominance orientation and political attitudes reflect common genetic underpinnings. Proceedings of the National Academy of Sciences of the United States of America. ISSN 0027-8424. 116(36), p. 17741–17746. doi: 10.1073/pnas.1818711116. Full text in Research Archive
  • Glad, Kristin Alve; Czajkowski, Nikolai Olavi; Dyb, Grete & Hafstad, Gertrud Sofie (2019). Cross-Lagged Association Between Symptoms of Posttraumatic Stress Disorder and Perceived Centrality of a Terrorist Attack. Clinical Psychological Science. ISSN 2167-7026. doi: 10.1177/2167702619873590. Full text in Research Archive
  • Biele, Guido; Gustavson, Kristin; Czajkowski, Nikolai Olavi; Nilsen, Roy Miodini; Reichborn-Kjennerud, Ted & Magnus, Per [Show all 8 contributors for this article] (2019). Bias from self selection and loss to follow-up in prospective cohort studies. European Journal of Epidemiology (EJE). ISSN 0393-2990. 34(10), p. 927–938. doi: 10.1007/s10654-019-00550-1.
  • Ulset, Vidar; Czajkowski, Nikolai Olavi; Kraft, Brage; Kraft, Pål; Wikenius, Ellen & Kleppestø, Thomas Haarklau [Show all 7 contributors for this article] (2019). Are unpopular children more likely to get sick? Longitudinal links between popularity and infectious diseases in early childhood . PLOS ONE. ISSN 1932-6203. 14(9), p. 1–14. doi: 10.1371/journal.pone.0222222. Full text in Research Archive
  • Kendler, Kenneth S.; Aggen, Steven H.; Gillespie, Nathan; Czajkowski, Nikolai Olavi; Ystrøm, Eivind & Reichborn-Kjennerud, Ted (2019). A twin study of cigarette and snus initiation and quantity of use in Norwegian Adult Twins. Twin Research and Human Genetics. ISSN 1832-4274. 22(2), p. 108–113. doi: 10.1017/thg.2019.9. Full text in Research Archive
  • Torvik, Fartein Ask; Rosenström, Tom Henrik; Gustavson, Kristin; Ystrøm, Eivind; Kendler, Kenneth S. & Bramness, Jørgen Gustav [Show all 8 contributors for this article] (2019). Explaining the association between anxiety disorders and alcohol use disorder: A twin study. Depression and Anxiety. ISSN 1091-4269. 36(6), p. 522–532. doi: 10.1002/da.22886. Full text in Research Archive
  • Kendler, Kenneth S.; Aggen, Steven H.; Gillespie, Nathan; Krueger, Robert F.; Czajkowski, Nikolai Olavi & Ystrøm, Eivind [Show all 7 contributors for this article] (2019). The structure of genetic and environmental influences on normative personality, abnormal personality traits, and personality disorder symptoms. Psychological Medicine. ISSN 0033-2917. 49(8), p. 1392–1399. doi: 10.1017/S0033291719000047. Full text in Research Archive
  • Fu, Susie; Czajkowski, Nikolai Olavi & Torgalsbøen, Anne-Kari (2019). Cognitive, work and social outcomes in fully recovered first-episode schizophrenia: On and off antipsychotic medication. Psychiatry. ISSN 0033-2747. doi: 10.1080/00332747.2018.1550735.
  • Rosenström, Tom Henrik; Czajkowski, Nikolai Olavi; Ystrøm, Eivind; Krueger, Robert F; Aggen, Steven H & Gillespie, Nathan A [Show all 9 contributors for this article] (2019). Genetically Informative Mediation Modeling Applied to Stressors and Personality-Disorder Traits in Etiology of Alcohol Use Disorder. Behavior Genetics. ISSN 0001-8244. 49(1), p. 11–23. doi: 10.1007/s10519-018-9941-z. Full text in Research Archive
  • Czajkowski, Nikolai Olavi; Aggen, Steven H.; Krueger, Robert F; Kendler, Kenneth S.; Neale, Michael C. & Knudsen, Gun Peggy [Show all 10 contributors for this article] (2018). A Twin Study of Normative Personality and DSM-IV Personality Disorder Criterion Counts: Evidence for Separate Genetic Influences. American Journal of Psychiatry. ISSN 0002-953X. 175(7), p. 649–656. doi: 10.1176/appi.ajp.2017.17050493.
  • Knutsen, Marie Lindebø; Czajkowski, Nikolai Olavi & Ormhaug, Silje Mørup (2018). Changes in posttraumatic stress symptoms, cognitions, and depression during treatment of traumatized youth. Behaviour Research and Therapy. ISSN 0005-7967. 111, p. 119–126. doi: 10.1016/j.brat.2018.10.010.
  • Rosenström, Tom Henrik; Gjerde, Line C.; Krueger, Robert Frederick; Aggen, Steven H.; Czajkowski, Nikolai Olavi & Gillespie, Nathan A. [Show all 10 contributors for this article] (2018). Joint factorial structure of psychopathology and personality. Psychological Medicine. ISSN 0033-2917. doi: 10.1017/S0033291718002982. Full text in Research Archive
  • Røysamb, Espen; Nes, Ragnhild Bang; Czajkowski, Nikolai Olavi & Vassend, Olav (2018). Genetics, personality and wellbeing. A twin study of traits, facets and life satisfaction. Scientific Reports. ISSN 2045-2322. 8. doi: 10.1038/s41598-018-29881-x. Full text in Research Archive
  • Vassend, Olav; Røysamb, Espen; Nielsen, Christopher Sivert & Czajkowski, Nikolai Olavi (2018). Fatigue symptoms in relation to neuroticism, anxiety-depression, and musculoskeletal pain. A longitudinal twin study. PLOS ONE. ISSN 1932-6203. 13(6). doi: 10.1371/journal.pone.0198594. Full text in Research Archive
  • Fu, Susie; Czajkowski, Nikolai Olavi & Torgalsbøen, Anne-Kari (2018). Cognitive improvement in first-episode schizophrenia and healthy controls: A 6-year multi-assessment follow-up study. Psychiatry Research. ISSN 0165-1781. 267, p. 319–326. doi: 10.1016/j.psychres.2018.06.016. Full text in Research Archive
  • Gillespie, Nathan A.; Aggen, Steven H.; Gentry, Amanda E.; Neale, Michael Churton; Knudsen, Gun Peggy S. & Krueger, Robert Frederick [Show all 14 contributors for this article] (2018). Testing Genetic and Environmental Associations Between Personality Disorders and Cocaine Use: A Population-Based Twin Study. Twin Research and Human Genetics. ISSN 1832-4274. 21(1), p. 24–32. doi: 10.1017/thg.2017.73. Full text in Research Archive
  • Gillespie, Nathan A.; Aggen, Steven H.; Neale, Michael C.; Knudsen, Gun Peggy S.; Krueger, Robert F. & South, Susan C. [Show all 11 contributors for this article] (2018). Associations between personality disorders and cannabis use and cannabis use disorder: a population‐based twin study. Addiction. ISSN 0965-2140. 113(8), p. 1488–1498. doi: 10.1111/add.14209. Full text in Research Archive
  • Welander-Vatn, Audun; Torvik, Fartein Ask; Czajkowski, Nikolai Olavi; Kendler, Kenneth S; Reichborn-Kjennerud, Ted & Knudsen, Gun Peggy S. [Show all 7 contributors for this article] (2018). Relationships Among Avoidant Personality Disorder, Social Anxiety Disorder, and Normative Personality Traits: A Twin Study. Journal of Personality Disorders. ISSN 0885-579X. 33(3), p. 289–309. doi: 10.1521/pedi_2018_32_341. Full text in Research Archive
  • Torgalsbøen, Anne-Kari; Fu, Susie & Czajkowski, Nikolai Olavi (2018). Resilience trajectories to full recovery in first-episode schizophrenia. European psychiatry. ISSN 0924-9338. 52, p. 54–60. doi: 10.1016/j.eurpsy.2018.04.007. Full text in Research Archive
  • Rosenström, Tom Henrik; Torvik, Fartein Ask; Ystrøm, Eivind; Czajkowski, Nikolai Olavi; Gillespie, Nathan A. & Aggen, Steven H. [Show all 9 contributors for this article] (2018). Prediction of alcohol use disorder using personality disorder traits: a twin study. Addiction. ISSN 0965-2140. 113(1), p. 15–24. doi: 10.1111/add.13951.
  • Øie, Merete Glenne; Hovik, Kjell Tore; Andersen, Per Normann; Czajkowski, Nikolai Olavi & Skogli, Erik Winther (2018). Gender differences in the relationship between changes in ADHD symptoms, executive function, and self- and parent-report depression symptoms in boys and girls with ADHD: A two-year follow-up study. Journal of Attention Disorders. ISSN 1087-0547. 22(5), p. 446–459. doi: 10.1177/1087054716664407.
  • Torvik, Fartein Ask; Rosenström, Tom Henrik; Ystrøm, Eivind; Tambs, Kristian; Røysamb, Espen & Czajkowski, Nikolai Olavi [Show all 10 contributors for this article] (2017). Stability and change in etiological factors for alcohol use disorder and major depression. Journal of Abnormal Psychology. ISSN 0021-843X. 126(6), p. 812–822. doi: 10.1037/abn0000280. Full text in Research Archive
  • Fu, Susie; Czajkowski, Nikolai Olavi; Rund, Bjørn Rishovd & Torgalsbøen, Anne-Kari (2017). The relationship between level of cognitive impairments and functional outcome trajectories in first-episode schizophrenia. Schizophrenia Research. ISSN 0920-9964. 190, p. 144–149. doi: 10.1016/j.schres.2017.03.002. Full text in Research Archive
  • Rosenström, Tom Henrik; Ystrøm, Eivind; Torvik, Fartein Ask; Czajkowski, Nikolai Olavi; Gillespie, Nathan A. & Aggen, Steven H. [Show all 9 contributors for this article] (2017). Genetic and Environmental Structure of DSM-IV Criteria for Antisocial Personality Disorder: A Twin Study. Behavior Genetics. ISSN 0001-8244. 47(3), p. 265–277. doi: 10.1007/s10519-016-9833-z.
  • Reichborn-Kjennerud, Ted; Krueger, R F; Ystrøm, Eivind; Torvik, Fartein Ask; Rosenström, Tom Henrik & Aggen, S H [Show all 11 contributors for this article] (2017). Do DSM-5 Section II personality disorders and Section III personality trait domains reflect the same genetic and environmental risk factors? Psychological Medicine. ISSN 0033-2917. 47(12), p. 2205–2215. doi: 10.1017/S0033291717000824.
  • Eilertsen, Espen Moen; Gjerde, Line C.; Reichborn-Kjennerud, Ted; Ørstavik, Ragnhild; Knudsen, Gun Peggy & Stoltenberg, Camilla [Show all 10 contributors for this article] (2017). Maternal alcohol use during pregnancy and offspring attention-deficit hyperactivity disorder (ADHD): a prospective sibling control study. International Journal of Epidemiology. ISSN 0300-5771. 46(5), p. 1633–1640. doi: 10.1093/ije/dyx067. Full text in Research Archive
  • Long, Elizabeth C.; Aggen, Steven H.; Neale, Michael Churton; Knudsen, Gun Peggy; Krueger, Robert Frederick & South, Susan Carol [Show all 13 contributors for this article] (2017). The association between personality disorders with alcohol use and misuse: A population-based twin study. Drug and Alcohol Dependence. ISSN 0376-8716. 174, p. 171–180. doi: 10.1016/j.drugalcdep.2017.01.022.
  • Vassend, Olav; Røysamb, Espen; Nielsen, Christopher Sivert & Czajkowski, Nikolai Olavi (2017). Musculoskeletal Complaints, Anxiety–Depression Symptoms, and Neuroticism: A Study of Middle-Aged Twins. Health Psychology. ISSN 0278-6133. 36(8), p. 729–739. doi: 10.1037/hea0000484.

View all works in Cristin

  • Green Krogshus, Kristian; Bjertness, Espen; Czajkowski, Nikolai Olavi; Bang Nes, Ragnhild & Rodriguez-Cano, Ruben (2023). 5 Ways to Promote Wellbeing @School.
  • Eftedal, Nikolai Haahjem; Eilertsen, Espen Moen; Sunde, Hans Fredrik; Kleppestø, Thomas Haarklau; Ystrøm, Eivind & Czajkowski, Nikolai Olavi (2023). Correlations on Norwegian national standardized tests between millions of pairs of relatives: Exploring the impacts of assortative mating and parental effects.
  • Smajlagic, Dinka; Tsotsi, Stella; Gjerdevik, Miriam; Page, Christian Magnus; Zayats, Tetyana & Austerberry, Chloe [Show all 14 contributors for this article] (2022). Parent-of-origin effects in childhood aggression.
  • Prydz, Monica Beer; Czajkowski, Nikolai Olavi; Eilertsen, Maja & Nes, Ragnhild Bang (2022). Helsekompetansens kraft i folkehelsearbeidet. Hvordan kan helsekompetanse innlemmes i folkehelsearbeid?
  • Prydz, Monica Beer; Czajkowski, Nikolai Olavi; Bang Nes, Ragnhild; Røysamb, Espen & Eilertsen, Maja (2022). Promoting wellbeing and preventing mental health problems: A randomized controlled trail of the Five Ways to Wellbeing Intervention .
  • Nes, Ragnhild Bang; Czajkowski, Nikolai Olavi; Røysamb, Espen & Eilertsen, Maja Gunvor (2022). Promoting wellbeing and preventing mental health problems: A randomized controlled trail of the Five Ways to All Intervention .
  • Nes, Ragnhild Bang; Røysamb, Espen; Eilertsen, Maja Gunvor & Czajkowski, Nikolai Olavi (2022). Promoting Wellbeing using the Five Ways to Wellbeing framework .
  • Eilertsen, Maja; Nes, Ragnhild Bang; Czajkowski, Nikolai Olavi; Røysamb, Espen & Prydz, Monica Beer (2022). Promoting Wellbeing using the Five Ways to Wellbeing framework .
  • Eilertsen, Maja; Nes, Ragnhild Bang; Czajkowski, Nikolai Olavi; Røysamb, Espen; Ørstavik, Ragnhild & Vassend, Olav Mandt (2022). Effects of illness on wellbeing: A co-twin control analysis.
  • Eilertsen, Maja; Nes, Ragnhild Bang; Prydz, Monica Beer; Røysamb, Espen & Czajkowski, Nikolai Olavi (2022). Bridging the gap - from research to practice.
  • Tsotsi, Stella; Goh, shaun; Czajkowski, Nikolai Olavi; Smajlagic, Dinka; Coplan, Robert & Bølstad, Evalill [Show all 7 contributors for this article] (2022). The co-occurrence of emotional difficulties and aggression in early childhood and the risk of later mental health outcomes: The Norwegian Mother, Father and Child Cohort.
  • Kozlowski Mayerhofer, Lilian Juliane; Nes, Ragnhild Bang; Lan, Xiaoyu; Czajkowski, Nikolai Olavi; Ystrøm, Eivind & Røysamb, Espen (2022). Social support and wellbeing across the pre- and postnatal period in women victim of abuse: Findings from the Norwegian Mother, Father and Child Cohort Study.
  • Eilertsen, Maja Gunvor; Nes, Ragnhild Bang; Røysamb, Espen & Czajkowski, Nikolai Olavi (2022). Fem grep for økt Hverdagsglede på tvers av nivåer.
  • Torgalsbøen, Anne Kari & Czajkowski, Nikolai Olavi (2022). Full recovery and self-efficacy in first episode schizophrenia: The OSR cohort at 10 year follow-up.
  • Siegel, Marte Langenes; Binder, Eva Mathilde Gullestad; Dahl, Hanne-Sofie Johnsen ; Czajkowski, Nikolai Olavi; Critchfield, Kenneth L. & Høglend, Per Andreas [Show all 7 contributors for this article] (2020). Erratum: Therapeutic atmosphere in psychotherapy sessions. int. j. environ. res. public health 2020, 17, 4105. International Journal of Environmental Research and Public Health (IJERPH). ISSN 1661-7827. 17(14), p. 1–2. doi: 10.3390/ijerph17145241.
  • Glad, Kristin Alve; Stensland, Synne; Czajkowski, Nikolai Olavi; Boelen, Paul & Dyb, Grete (2020). The longitudinal association between symptoms of posttraumatic stress and complicated grief. A random intercepts cross-lag analysis.
  • Glad, Kristin Alve; Stensland, Synne; Czajkowski, Nikolai Olavi; Boelen, Paul & Dyb, Grete (2019). The longitudinal association between complicated grief and symptoms of posttraumatic stress. A random-intercept cross-lag analysis.
  • Rognli, Erling W.; Villabø, Marianne & Czajkowski, Nikolai Olavi (2019). Discrepant Reports of Parent-adolescent Conflict is Associated with Hopelessness in Adolescent Depression.
  • Kleppestø, Thomas Haarklau; Czajkowski, Nikolai Olavi; Vassend, Olav; Røysamb, Espen; Eftedal, Nikolai Haahjem & Kunst, Jonas R. [Show all 8 contributors for this article] (2019). Social dominance orientation has both genetic and unique environmental influences, but only genetic pleiotropy accounts for its correlation with political attitudes.
  • Waraan, Luxsiya; Rognli, Erling W.; Mehlum, Lars; Czajkowski, Nikolai Olavi & Villabø, Marianne (2019). The efficacy of psychotherapy for suicidal ideation in youth.
  • Waraan, Luxsiya; Rognli, Erling W.; Mehlum, Lars; Czajkowski, Nikolai Olavi & Villabø, Marianne (2018). The association between Attachment Style to Father and Suicidal Ideation in Adolescents with Depression. .
  • Eilertsen, Espen Moen; Hannigan, Laurie John; McAdams, Tom A.; Rijsdijk, Fruhling; Czajkowski, Nikolai Olavi & Reichborn-Kjennerud, Ted [Show all 8 contributors for this article] (2018). Parental prenatal depression and offspring ADHD: a genetically informed intergenerational study. Behavior Genetics. ISSN 0001-8244. p. 469–469.
  • Eilertsen, Espen Moen; Hannigan, Laurie John; Mcadams, Tom; Rijsdijk, Fruhling; Czajkowski, Nikolai Olavi & Reichborn-Kjennerud, Ted [Show all 8 contributors for this article] (2018). Parental prenatal depression and offspring ADHD: A genetically informed intergenerational study.
  • Rosenström, Tom Henrik; Czajkowski, Nikolai Olavi; Ystrøm, Eivind; Krueger, RF; Aggen, Steven H. & Gillespie, Nathan A. [Show all 9 contributors for this article] (2017). Stressful life events, antisocial and borderline personality traits, and alcohol use disorder: a genetically informative mediation study.
  • H. Kleppestø, Thomas; Czajkowski, Nikolai Olavi; Vassend, Olav; Røysamb, Espen; R. Kunst, Jonas & Thomsen, Lotte (2017). Preferring domination or egalitarianism: Genetic and environmental structure of Social Dominance Orientation.
  • Czajkowski, Nikolai Olavi; Bang Nes, Ragnhild; Vassend, Olav & Røysamb, Espen (2017). Effects of somatic and mental illness on subjective well-being. A discordant twin analysis.
  • Røysamb, Espen; Bang Nes, Ragnhild; Czajkowski, Nikolai Olavi & Vassend, Olav (2017). Anxiety, depression and life satisfaction after midlife. A twin study across 20 years.
  • Bang Nes, Ragnhild; Czajkowski, Nikolai Olavi; Røysamb, Espen & Vassend, Olav (2017). Components and sources of well-being and ill-being: A twin study.
  • Vassend, Olav; Nielsen, Christopher Sivert; Røysamb, Espen & Czajkowski, Nikolai Olavi (2017). Fatigue symptoms in relation to neuroticism, anxiety-depression, and musculoskeletal pain. A longitudinal study.
  • Torvik, Fartein Ask; Rosenström, Tom Henrik; Czajkowski, Nikolai Olavi; long, elizabeth; Gillespie, Nathan A. & Reichborn-Kjennerud, Ted (2017). Results from a longitudinal twin study combining diagnostic interviews and registry data on personality, mental disorders, and substance use.
  • Glad, Kristin Alve; Hafstad, Gertrud Sofie; Dyb, Grete & Czajkowski, Nikolai Olavi (2020). Transformed by trauma. A longitudinal study of posttraumatic stress, growth and perceived event centrality among youths and emerging adults after the terrorist attack on Utøya island . Damnett.
  • Rognli, Erling W.; Villabø, Marianne & Czajkowski, Nikolai Olavi (2020). Conflict with Parents in Adolescent Depression. Universitetet i Oslo. ISSN 1504-3991. Full text in Research Archive

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Published Jan. 31, 2012 11:23 AM - Last modified July 8, 2019 1:45 PM