Blar i Norwegian Institute of Public Health Open Repository på forfatter "Czajkowski, Nikolai Olavi"
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Ludvig Dahl's psychiatric genetic studies in his 1859 monograph: “Contribution to the knowledge of insanity in Norway”
Kendler, Kenneth S.; Czajkowski, Nikolai Olavi; Reichborn-Kjennerud, Ted (Peer reviewed; Journal article, 2022) -
Maternal alcohol use during pregnancy and offspring attention-deficit hyperactivity disorder (ADHD): a prospective sibling control study
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 (Peer reviewed; Journal article, 2017) -
Parental Prenatal Symptoms of Depression and Offspring Symptoms of ADHD: A Genetically Informed Intergenerational Study
Eilertsen, Espen Moen; Hannigan, Laurie John; McAdams, Tom A.; Rijsdijk, Frühling V.; Czajkowski, Nikolai Olavi; Reichborn-Kjennerud, Ted; Ystrøm, Eivind; Gjerde, Line C. (Peer reviewed; Journal article, 2020) -
Relationships Among Avoidant Personality Disorder, Social Anxiety Disorder, and Normative Personality Traits: A Twin Study
Welander-Vatn, Audun; Torvik, Fartein Ask; Czajkowski, Nikolai Olavi; Kendler, Kenneth S; Reichborn-Kjennerud, Ted; Knudsen, Gun Peggy S.; Ystrøm, Eivind (Peer reviewed; Journal article, 2018) -
Socioeconomic status and sick leave granted for mental and somatic disorders: a prospective study of young adult twins
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, 2015) -
Specific Antisocial and Borderline Personality Disorder Criteria and General Substance Use: A Twin Study
Rosenström, Tom Henrik; Torvik, Fartein Ask; Ystrøm, Eivind; Aggen, Steven H.; Gillespie, Nathan A.; Krueger, Robert F.; Czajkowski, Nikolai Olavi; Kendler, Kenneth S.; Reichborn-Kjennerud, Ted (Peer reviewed; Journal article, 2020) -
Stability and change in etiological factors for alcohol use disorder and major depression
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 (Peer reviewed; Journal article, 2017) -
Testing Genetic and Environmental Associations Between Personality Disorders and Cocaine Use: A Population-Based Twin Study
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 (Peer reviewed; Journal article, 2018) -
The impact of diagnosed fetal anomaly, diagnostic severity and prognostic ambiguity on parental depression and traumatic stress: a prospective longitudinal cohort study
Bekkhus, Mona; Haugen, Guttorm Nils; Czajkowski, Nikolai Olavi; Kaasen, Anne (Peer reviewed; Journal article, 2022) -
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 Anita (Peer reviewed; Journal article, 2021) -
The Norwegian twin registry
Nilsen, Thomas Sevenius; Brandt, Ingunn; Czajkowski, Nikolai Olavi; Knudsen, Gun Peggy; Magnus, Per; Reichborn-Kjennerud, Ted; Tambs, Kristian; Harris, Jennifer; Ørstavik, Ragnhild (Peer reviewed; Journal article, 2016) -
The relationship between level of cognitive impairments and functional outcome trajectories in first-episode schizophrenia
Fu, Susie; Czajkowski, Nikolai Olavi; Rund, Bjørn Rishovd; Torgalsbøen, Anne-Kari (Peer reviewed; Journal article, 2017) -
The role of neuroticism and pain in dental anxiety: A twin study
Vassend, Olav Mandt; Czajkowski, Nikolai Olavi; Røysamb, Espen; Nielsen, Christopher Sivert (Peer reviewed; Journal article, 2022) -
The role of sense of coherence and loneliness in borderline personality disorder traits: a longitudinal twin study
Skaug, Eirunn; Czajkowski, Nikolai Olavi; Waaktaar, Trine; Torgersen, Svenn (Peer reviewed; Journal article, 2022) -
The structure of genetic and environmental influences on normative personality, abnormal personality traits, and personality disorder symptoms
Kendler, Kenneth S.; Aggen, Steven H.; Gillespie, Nathan; Krueger, Robert F.; Czajkowski, Nikolai Olavi; Ystrøm, Eivind; Reichborn-Kjennerud, Ted (Peer reviewed; Journal article, 2019) -
Using informant discrepancies in report of parent–adolescent conflict to predict hopelessness in adolescent depression
Rognli, Erling; Aalberg, Marianne; Czajkowski, Nikolai Olavi (Peer reviewed; Journal article, 2020)Hopelessness is an important symptom of adolescent depression, being associated with both risk of suicide and poor treatment response, but predictors of hopelessness are understudied. Conflict with parents is common in ... -
Using informant discrepancies in report of parent–adolescent conflict to predict hopelessness in adolescent depression
Rognli, Erling; Aalberg, Marianne; Czajkowski, Nikolai Olavi (Peer reviewed; Journal article, 2020)