Ole Klungsøyr

• Nyquist, Emil; Dalgaard, Jakob; Spetalen, Signe; Torkildsen, Synne; Frøen, Hege & Galteland, Eivind [Show all 17 contributors for this article] (2023). Pathogenic DDX41 variants, possible response predictors to low-dose melphalan in hypo- and normocellular MDS and AML. British Journal of Haematology. ISSN 0007-1048. 204(2), p. 724–729. doi: 10.1111/bjh.19226. Full text in Research Archive
• Jacobsen, Henrik Børsting; Lyby, Peter Solvoll; Johansen, Thomas; Reme, Silje Endresen & Klungsøyr, Ole (2023). Can cognitive inflexibility reduce symptoms of anxiety and depression? Promoting the structural nested mean model in psychotherapy research. Psychotherapy Research. ISSN 1050-3307. 33(8), p. 1096–1116. doi: 10.1080/10503307.2023.2221808. Full text in Research Archive
• Dibaj, Iselin Solerød; Tørmoen, Anita Johanna; Klungsøyr, Ole; Haga, Egil & Mehlum, Lars (2023). Trajectories and Predictors of Change in Emotion Dysregulation and Deliberate Self-Harm Amongst Adolescents with Borderline Features. Clinical Child Psychology and Psychiatry. ISSN 1359-1045. 29(2), p. 407–423. doi: 10.1177/13591045231177374. Full text in Research Archive
• Dong, Li; Nygård, Mari; Støer, Nathalie Charlotte; Klungsøyr, Ole & Hansen, Bo Lars Thorvald Terning (2023). Real-world effectiveness of HPV vaccination against cervical neoplasia among birth cohorts ineligible for routine vaccination. International Journal of Cancer. ISSN 0020-7136. 153(2), p. 399–406. doi: 10.1002/ijc.34489.
• Brager-Larsen, Anne Trana; Zeiner, Pål; Klungsøyr, Ole & Mehlum, Lars (2022). Is age of self-harm onset associated with increased frequency of non-suicidal self-injury and suicide attempts in adolescent outpatients? BMC Psychiatry. ISSN 1471-244X. 22(1). doi: 10.1186/s12888-022-03712-w. Full text in Research Archive
• Kvarstein, Elfrida Hartveit; Antonsen, Bjørnar Torske; Klungsøyr, Ole; Pedersen, Geir Arild Feigum & Wilberg, Theresa (2021). A Longitudinal, Observational Study Investigating Predictors of Change in a Clinical Sample. Personality Disorders: Theory, Research, and Treatment. ISSN 1949-2715. doi: 10.1037/per0000471.
• Klungsøyr, Ole; Lystad, June Ullevoldsæter; Bull, Helen; Evensen, Stig; Ueland, Torill & Falkum, Erik (2021). G-estimation of causal pathways in vocational rehabilitation for adults with psychotic disorders – a secondary analysis of a randomized trial. BMC Psychiatry. ISSN 1471-244X. 21(1), p. 1–13. doi: 10.1186/s12888-021-03349-1. Full text in Research Archive
• Otterstad, Jan Erik; Norum, Ingvild Billehaug; Ruddox, Vidar; Le, An Chau Maria; Bendz, Bjørn & Munkhaugen, John [Show all 8 contributors for this article] (2021). Prognostic impact of non-improvement of global longitudinal strain in patients with revascularized acute myocardial infarction. The International Journal of Cardiovascular Imaging. ISSN 1569-5794. 37, p. 3477–3487. doi: 10.1007/s10554-021-02349-2. Full text in Research Archive Show summary

  Global longitudinal strain (GLS) is a more sensitive prognostic factor than left ventricular ejection fraction (LVEF) in various cardiac diseases. Little is known about the clinical impact of GLS changes after acute myocardial infarction (AMI). The present study aimed to explore if non-improvement of GLS after 3 months was associated with higher risk of subsequent composite cardiovascular events (CCVE). Patients with AMI were consecutively included at a secondary care center in Norway between April 2016 and July 2018 within 4 days following percutaneous coronary intervention. Echocardiography was performed at baseline and after 3 months. Patients were categorized with non-improvement (0 to − 100%) or improvement (0 to 100%) in GLS relative to the baseline value. Among 214 patients with mean age 65 (± 10) years and mean LVEF 50% (± 8) at baseline, 50 (23%) had non-improvement (GLS: − 16.0% (± 3.7) to − 14.2% (± 3.6)) and 164 (77%) had improvement (GLS: − 14.0% (± 3.0) to − 16.9% (± 3.0%)). During a mean follow-up of 3.3 years (95% CI 3.2 to 3.4) 77 CCVE occurred in 52 patients. In adjusted Cox regression analyses, baseline GLS was associated with all recurrent CCVE (HR 1.1, 95% CI 1.0 to 1.2, p < 0.001) whereas non-improvement versus improvement over 3 months follow-up was not. Baseline GLS was significantly associated with the number of CCVE in revascularized AMI patients whereas non-improvement of GLS after 3 months was not. Further large-scale studies are needed before repeated GLS measurements may be recommended in clinical practice.

• Røssberg, Jan Ivar; Evensen, Julie Horgen; Dammen, Toril; Wilberg, Theresa; Klungsøyr, Ole & Jones, Maria-Helene [Show all 11 contributors for this article] (2021). Mechanisms of change and heterogeneous treatment effects in psychodynamic and cognitive behavioural therapy for patients with depressive disorder: a randomized controlled trial. BMC Psychology. ISSN 2050-7283. 9, p. 1–14. doi: 10.1186/s40359-021-00517-6. Full text in Research Archive
• Øie, Merete Glenne; Sundet, Kjetil Søren; Haug, Elisabeth; Zeiner, Pål; Klungsøyr, Ole & Rund, Bjørn Rishovd (2021). Cognitive Performance in Early-Onset Schizophrenia and Attention-Deficit/Hyperactivity Disorder: A 25-Year Follow-up Study . Frontiers in Psychology. ISSN 1664-1078. doi: 10.3389/fpsyg.2020.606365. Full text in Research Archive Show summary

  Early-Onset Schizophrenia (EOS) and Attention Deficit-Hyperactivity Disorder (ADHD) are early- onset neurodevelopmental disorders associated with cognitive deficits. The current study represents the first attempt to compare these groups on a comprehensive cognitive test battery in a longitudinal design over 25 years in order to enhance our knowledge of particular patterns resulting from the interaction between normal maturational processes and different illness processes of these disorders. In the baseline study, 19 adolescents with schizophrenia were compared to 20 adolescents with ADHD and 30 healthy controls (HC), all between 12 and 18 years of age. After 13 years (T2) and after 25 years (T3) they were re-evaluated with the cognitive test battery. A cognitive Composite Score was used in a linear mixed model. The EOS group had a significant cognitive stagnation or deterioration from T1 to T2 compared to HC. However, the EOS group had the most positive change from T2 to T3, supporting a stable level of cognitive performance over the 25 year span. The ADHD group improved or had similar development as the HC group from T1 to T2. They continued to improve significantly compared to the HC group from T2 to T3. Individuals in the EOS group performed more impaired on the cognitive composite score compared to the HC group and the ADHD group at all three time points. Results might indicate a neurodevelopmental pathway of EOS with subnormal cognitive development specific in adolescence. In comparison, the ADHD group had a more consistent cognitive maturation supporting a maturational delay hypothesis of ADHD.

• Jacobsen, Henrik Børsting; Klungsøyr, Ole; Landrø, Nils Inge; Stiles, Tore C & Roche, Bryan T (2020). MINDFLEX Training for Cognitive Flexibility in Chronic Pain: A Randomized, Controlled Cross-Over Trial. Frontiers in Psychology. ISSN 1664-1078. 11. doi: 10.3389/fpsyg.2020.604832. Full text in Research Archive
• Chahal-Kummen, Monica; Høgestøl, Ingvild Kristine; Eribe, Inger; Klungsøyr, Ole; Kristinsson, Jon Adalsteinn & Mala, Tom (2019). Abdominal pain and symptoms before and after Roux-en-Y gastric bypass. BJS Open. ISSN 2474-9842. 3(3), p. 317–326. doi: 10.1002/bjs5.50148. Full text in Research Archive
• Jansen, Aina; Berg, Jens Petter; Klungsøyr, Ole; Müller, Mette Helen Bjørge; Lyche, Jan Ludvig & Aaseth, Jan (2019). The Influence of Persistent Organic Pollutants on Thyroidal, Reproductive and Adrenal Hormones After Bariatric Surgery. Obesity Surgery. ISSN 0960-8923. doi: 10.1007/s11695-019-04273-w. Show summary

  Persistent organic pollutants (POPs) including organochlorine pesticides, polychlorinated biphenyls (PCBs), and per- and polyfluoroalkylated substances (PFASs) are suspected endocrine disruptors. AIM: To evaluate the associations between POPs and thyroidal, reproductive, and adrenal hormones in a study population treated with bariatric surgery. METHODS: Blood samples from a cohort of 63 participants before and 1 year after bariatric surgery were analyzed for 16 lipophilic POPs, 17 PFASs, and thyroidal, reproductive, and adrenal hormones. Participants reporting relevant medical conditions or interfering medication were excluded, and plausible confounders were corrected for in multiple regression analyses. RESULTS: Free thyroxine (fT4) showed a significant decrease from preoperative to postoperative follow-up, and regression analyses demonstrated that p,p'-dichlorodiphenyldichloroethylene (p,p-DDE) was inversely associated with the ratio free triiodothyronine/free thyroxine (fT3/fT4). Testosterone concentrations in male participants increased significantly in the study period, and sex hormone-binding globulin (SHBG) increased in both gender. Regression analyses showed positive associations between increased levels of lipophilic POPs and the raised postoperative testosterone and SHBG concentrations in males. For females, an inverse association between the sum perfluoroalkyl carboxylic acids (ΣPFCA) and SHBG was seen. Regression analyses of postoperative serum cortisol concentrations on changes in hexachlorobenzene (HCB) showed a non-significant inverse association. CONCLUSION: The results suggest that POPs may have an influence on the hypothalamic-pituitary-thyroid (HPT) and the hypothalamic-pituitary-gonadal (HPG) axes after bariatric surgery. Because of small sample sizes and discrepancy in the sampling time points pre- and postoperatively, the observed hormonal impacts of POPs must be interpreted as associative and not causative. Further studies are needed to confirm the findings.

• Hanvold, Susanna; Vinknes, Kathrine; Løken, Elin Bjørge; Hjartåker, Anette; Klungsøyr, Ole & Birkeland, Eline [Show all 10 contributors for this article] (2019). Does Lifestyle Intervention After Gastric Bypass Surgery Prevent Weight Regain? A Randomized Clinical Trial. Obesity Surgery. ISSN 0960-8923. 29(11), p. 3419–3431. doi: 10.1007/s11695-019-04109-7. Full text in Research Archive
• Jansen, Aina; Müller, Mette Helen Bjørge; Grønnestad, Randi; Klungsøyr, Ole; Polder, Anuschka & Skjerve, Eystein [Show all 8 contributors for this article] (2018). Decreased plasma levels of perfluoroalkylated substances one year after bariatric surgery. Science of the Total Environment. ISSN 0048-9697. 657, p. 863–870. doi: 10.1016/j.scitotenv.2018.11.453. Show summary

  Per- and polyfluoroalkylated substances (PFASs) are classified as persistent organic pollutants (POPs), and known to be protein bound. The aim of the present study was to determine the levels of 17 different PFASs before and one year after bariatric surgery, and to assess whether weight loss and changed serum protein concentrations could be influencing factors. Plasma samples from 63 patients were analyzed for nine perfluoroalkyl carboxylic acids (PFCAs), three perfluoroalkane sulfonic acids (PFSAs), and five perfluoroalkyl sulfonamide based substances (PASF) before and after surgery. Protein determination was performed in the corresponding serum samples. Mean weight loss one year after surgery was 32.1 kg. The plasma levels of all PFASs decreased with 4–34% compared to preoperative values, and included perfluorononanoic acid (PFNA), perfluorodecanoic acid (PFDA), perfluoroundecanoic acid (PFUnDA), and perfluorobutane sulfonate (PFBS), which have been identified with increasing levels in the general population during recent years. Serum protein concentrations also decreased with 7–8%. Although protein levels were positively correlated with PFOA, PFBS, PFHxS and PFOS, regression analysis revealed that neither weight loss nor reductions in concentrations of serum protein could explain the decreased PFAS levels. The type of surgical procedure did not influence the changes of PFAS levels between the two sample points. A reduced food intake and alterations in absorptions of nutrients after bariatric surgery may have influenced the observed decreasing plasma levels of PFASs.

• Klungsøyr, Ole & Fredriksen, Mats (2017). Pharmacological Treatment of Adult Attention-Deficit/Hyperactivity Disorder (ADHD) in a Longitudinal Observational Study: Estimated Treatment Effect Strengthened by Improved Covariate Balance. Open Journal of Statistics. ISSN 2161-718X. 7, p. 988–1012. doi: 10.4236/ojs.2017.76070.
• Klungsøyr, Ole; Antonsen, Bjørnar Torske & Wilberg, Theresa (2017). Contours of a causal feedback mechanism between adaptive personality and psychosocial function in patients with personality disorders: A secondary analysis from a randomized clinical trial. BMC Psychiatry. ISSN 1471-244X. 17:210, p. 1–13. doi: 10.1186/s12888-017-1365-4.
• Falkum, Erik; Klungsøyr, Ole; Lystad, June Ullevoldsæter; Bull, Helen Christine; Evensen, Stig & Martinsen, Egil Wilhelm [Show all 8 contributors for this article] (2017). Vocational rehabilitation for adults with psychotic disorders in a Scandinavian welfare society. BMC Psychiatry. ISSN 1471-244X. 17:24, p. 1–11. doi: 10.1186/s12888-016-1183-0. Full text in Research Archive
• Leinonen, Maarit; Campbell, Suzanne; Klungsøyr, Ole; Lönnberg, Stefan; Hansen, Bo Terning & Nygård, Mari (2017). Personal and provider level factors influence participation to cervical cancer screening: A retrospective register-based study of 1.3 million women in Norway. Preventive Medicine. ISSN 0091-7435. 94, p. 31–39. doi: 10.1016/j.ypmed.2016.11.018.
• Evensen, Stig; Ueland, Torill; Lystad, June Ullevoldsæter; Bull, Helen Christine; Klungsøyr, Ole & Martinsen, Egil Wilhelm [Show all 7 contributors for this article] (2017). Employment outcome and predictors of competitive employment at 2-year follow-up of a vocational rehabilitation programme for individuals with schizophrenia in a high-income welfare society. Nordic Journal of Psychiatry. ISSN 0803-9488. 71(3), p. 180–187. doi: 10.1080/08039488.2016.1247195. Full text in Research Archive
• Johansen, Merete Selsbakk; Normann, Eivind; Normann-Eide, Tone; Klungsøyr, Ole; Kvarstein, Elfrida Hartveit & Wilberg, Theresa (2016). Relationship Between Affect Consciousness and Personality Functioning in Patients With Personality Disorders: A Prospective Study. Journal of Personality Disorders. ISSN 0885-579X. 30(5), p. 633–652. doi: 10.1521/pedi_2015_29_220.
• Lorentzen, Steinar; Fjeldstad, Anette; Ruud, Torleif; Marble, Alice Ruth; Klungsøyr, Ole & ULBERG, RANDI [Show all 7 contributors for this article] (2015). The Effectiveness of Short- and Long-Term Psychodynamic Group Psychotherapy on Self-Concept: Three Years Follow-Up of a Randomized Clinical Trial . International journal of group psychotherapy. ISSN 0020-7284. 65(3), p. 362–85. doi: 10.1521/ijgp.2015.65.3.362.
• Fredriksen, Mats; Dahl, Alv A; Martinsen, Egil Wilhelm; Klungsøyr, Ole; Haavik, Jan & Peleikis, Dawn Elisabeth (2014). Effectiveness of one-year pharmacological treatment of adult attention-deficit/hyperactivity disorder (ADHD): An open-label prospective study of time in treatment, dose, side-effects and comorbidity. European Neuropsychopharmacology. ISSN 0924-977X. 24(12), p. 1873–1884. doi: 10.1016/j.euroneuro.2014.09.013.
• Antonsen, Bjørnar Torske; Klungsøyr, Ole; Kamps, Anne; Hummelen, Benjamin; Johansen, Merete Selsbakk & Pedersen, Geir Feigum [Show all 10 contributors for this article] (2014). Step-down versus outpatient psychotherapeutic treatment for personality disorders: 6-year follow-up of the Ullevål personality project. BMC Psychiatry. ISSN 1471-244X. 14(119). doi: 10.1186/1471-244X-14-119.
• Fredriksen, Mats; Dahl, Alv A; Martinsen, Egil Wilhelm; Klungsøyr, Ole; Faraone, Stephen V. & Peleikis, Dawn Elisabeth (2014). Childhood and persistent ADHD symptoms associated with educational failure and long-term occupational disability in adult ADHD. ADHD Attention Deficit and Hyperactivity Disorders. ISSN 1866-6116. 6(2), p. 87–99. doi: 10.1007/s12402-014-0126-1.
• Jordbru, Anika Aakerøy; Smedstad, Liv Marit; Klungsøyr, Ole & Martinsen, Egil Wilhelm (2014). Psychogenic gait disorder:A randomized controlled trial of physical rehabilitation with one-year follow-up. Journal of Rehabilitation Medicine. ISSN 1650-1977. 46(2), p. 181–187. doi: 10.2340/16501977-1246.
• Bakali, Jan Vegard; Wilberg, Theresa; Klungsøyr, Ole & Lorentzen, Steinar (2013). Development of Group Climate in Short- and Long-Term Psychodynamic Group Psychotherapy. International journal of group psychotherapy. ISSN 0020-7284. 63(3), p. 366–393. doi: 10.1521/ijgp.2013.63.3.366.
• Larsson, Sara; Aas, Monica; Klungsøyr, Ole; Agartz, Ingrid; Mork, Erlend & Steen, Nils Eiel [Show all 12 contributors for this article] (2013). Patterns of childhood adverse events are associated with clinical characteristics of bipolar disorder. BMC Psychiatry. ISSN 1471-244X. 13. doi: 10.1186/1471-244X-13-97.
• Klungsøyr, Ole; Sexton, Joseph; Sandanger, Inger & Nygård, Jan Franz (2013). A time-varying measurement error model for age of onset of a psychiatric diagnosis: applied to first depressive episode diagnosed by the Composite International Diagnostic Interview (CIDI). Journal of Applied Statistics. ISSN 0266-4763. 40(4), p. 843–861. doi: 10.1080/02664763.2012.756859.
• Gullestad, Frida Slagstad; Wilberg, Theresa; Klungsøyr, Ole; Johansen, Merete Selsbakk; Urnes, Øyvind & Karterud, Sigmund (2012). Is treatment in a day hospital step-down program superior to outpatient individual psychotherapy for patients with personality disorders? 36 months follow-up of a randomized clinical trial comparing different treatment modalities. Psychotherapy Research. ISSN 1050-3307. 22(4), p. 426–441. doi: 10.1080/10503307.2012.662608.
• Sørensen, Tom; Klungsøyr, Ole; Kleiner, Robert & Klepp, Olav Martin (2011). Social support and sense of coherence: Independent, shared and interaction relationships with life stress and mental health. International Journal of Mental Health Promotion. ISSN 1462-3730. 13(1), p. 27–44. doi: 10.1080/14623730.2011.9715648.
• Turnip, Sherly Saragih; Klungsøyr, Ole & Hauff, Edvard (2010). The mental Health of populations directly and indirectly exposed to violent conflict in Indonesia. Conflict and Health. ISSN 1752-1505. 4(14). doi: 10.1186/1752-1505-4-14.
• Turnip, Sherly Saragih; Klungsøyr, Ole & Hauff, Edvard (2010). The Mental Health Impact of Disaster of Populations Directly and Indirectly Exposed to violent Conflict in Indonesia. Conflict and Health. ISSN 1752-1505. 4, p. 14–14. doi: 10.1186/1752-1505-4-14.
• Røssberg, Jan Ivar; Johannessen, Jan Olav; Klungsøyr, Ole; Ilner, Stein E. Opjordsmoen; Evensen, Julie Horgen & Fjell, Anders Martin [Show all 17 contributors for this article] (2010). Are multi family groups appropriate for patients with first episode psychosis? A 5-year naturalistic follow-up study. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 122(5), p. 384–394. doi: 10.1111/j.1600-0447.2010.01571.x.
• Engh, John; Friis, Svein; Birkenæs, Astrid Brate; Jónsdóttir, Halldóra; Klungsøyr, Ole & Ringen, Petter Andreas [Show all 10 contributors for this article] (2010). Delusions Are Associated With Poor Cognitive Insight in Schizophrenia. Schizophrenia Bulletin. ISSN 0586-7614. 36(4), p. 830–835. doi: 10.1093/schbul/sbn193.
• Nygård, Jan F; Klungsøyr, Ole; Sandanger, Inger & Svensson, Elisabeth (2009). Selection effects in psychiatric epidemiology. A 14-year prospective study of the Hopkins Symptom Check List-25 as a predictor of mortality in the Norwegian general population. Social Psychiatry and Psychiatric Epidemiology. ISSN 0933-7954. 44(10), p. 881–886. doi: 10.1007/s00127-009-0010-z.
• Klungsøyr, Ole; Sexton, Joseph; Sandanger, Inger & Nygård, Jan Franz (2009). Sensitivity analysis for unmeasured confounding in a marginal structural Cox proportional hazards model. Lifetime Data Analysis. ISSN 1380-7870. 15(2), p. 278–294. doi: 10.1007/s10985-008-9109-x.
• Klungsøyr, Ole; Nygård, Mari; Skare, Gry; Eriksen, Tormod & Nygård, Jan Franz (2009). Validity of self-reported Pap smear history in Norwegian women. Journal of Medical Screening. ISSN 0969-1413. 16(2), p. 91–97. doi: 10.1258/jms.2009.008087.
• Engh, John; Friis, Svein; Birkenæs, Astrid Brate; Jónsdóttir, Halldóra; Klungsøyr, Ole & Ringen, Petter Andreas [Show all 10 contributors for this article] (2009). Delusions are associated with low cognitive insight in schizophrenia. Cognitive insight, delusions and hallucinations. Schizophrenia Bulletin. ISSN 0586-7614. doi: 10.1093/schbul/sbn193.
• Klungsøyr, Ole; Sexton, Joseph; Sandanger, Inger & Nygård, Jan Franz (2008). Sensitivity analysis for unmeasured confounding in a marginal structural Cox proportional hazards model. Lifetime Data Analysis. ISSN 1380-7870. doi: 10.1007/s10985-008-9109-x.
• Klungsøyr, Ole; Nygård, Jan Franz; Sørensen, Tom & Sandanger, Inger (2006). Cigarette smoking and incidence of first depressive episode: An 11-year, population-based follow-up study. American Journal of Epidemiology. ISSN 0002-9262. 163, p. 421–432.

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• Landrø, Nils Inge; Harmer, Catherine; Blackwell, Simon E.; Bø, Ragnhild; Dawson, Gerry & Goodwin, Guy [Show all 16 contributors for this article] (2023). Combining antidepressants and attention bias modification in primary health care (DEPTREAT): Protocol for a pragmatic randomized controlled trial. Contemporary Clinical Trials. ISSN 1551-7144. 133. doi: 10.1016/j.cct.2023.107326.
• Dammen, Toril; Tunheim, Kristoffer; Munkhaugen, John; Klungsøyr, Ole & Papageorgiou, Constantinos (2023). Attention training technique delivered in groups as treatment for anxiety and depression in patients with coronary heart disease: study protocol for a waiting-list randomized controlled trial. Frontiers in Psychology. ISSN 1664-1078. 14. doi: 10.3389/fpsyg.2023.1226539.
• Klepp, OM; Sørensen, Tom; Klungsøyr, Ole; Kleiner, Robert & Sørensen, Andreas (2013). Psychological coping concepts and quality of life - a gender perspective.
• Klungsøyr, Ole; Sørensen, Tom; Dalgard, Odd Steffen & Nygård, J (2009). Psychological distress as a precursor of depression.
• Nygård, Jan Franz; Sandanger, Inger; Sørensen, Tom & Klungsøyr, Ole (2004). HSCL-25 as a predictor of mortality. A 13 years follow-up study of a random population sample in Norway.
• Klungsøyr, Ole; Sandanger, Inger & Nygård, Jan Franz (2004). Does smoking cause depression?
• Klungsøyr, Ole; Sandanger, Inger & Nygård, Jan Franz (2003). Is smoking a riskfactor for depression?
• Sandanger, Inger; Nygård, Jan Franz; Sørensen, Tom; Dalgard, Odd Steffen; Platou, Waldemar S & Klungsøyr, Ole [Show all 7 contributors for this article] (2003). Endringer i psykiatrisk sykelighet 1990 - 2001.
• Nygård, Jan Franz; Sandanger, Inger & Klungsøyr, Ole (2003). Problems with prediction in mental health follow-up studies.

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