Publications 2021

Klungsoyr O, Lystad JU, Bull H, Evensen S, Ueland T, Falkum E (2021)
G-estimation of causal pathways in vocational rehabilitation for adults with psychotic disorders - a secondary analysis of a randomized trial
BMC Psychiatry, 21 (1), 370
DOI 10.1186/s12888-021-03349-1

Kvarstein EH, Antonsen BT, Klungsoyr O, Pedersen G, Wilberg T (2021)
Avoidant Personality Disorder and Social Functioning: A Longitudinal, Observational Study Investigating Predictors of Change in a Clinical Sample
Personal. Disord., 12 (6), 594-605
DOI 10.1037/per0000471

Oie MG, Sundet K, Haug E, Zeiner P, Klungsoyr O, Rund BR (2021)
Cognitive Performance in Early-Onset Schizophrenia and Attention-Deficit/Hyperactivity Disorder: A 25-Year Follow-Up Study
Front. Psychol., 11, 606365
DOI 10.3389/fpsyg.2020.606365

Otterstad JE, Norum IB, Ruddox V, Le ACM, Bendz B, Munkhaugen J, Klungsoyr O, Edvardsen T (2021)
Prognostic impact of non-improvement of global longitudinal strain in patients with revascularized acute myocardial infarction
Int. J. Cardiovasc. Imaging, 37 (12), 3477-3487
DOI 10.1007/s10554-021-02349-2

Rossberg JI, Evensen J, Dammen T, Wilberg T, Klungsoyr O, Jones M, Boen E, Egeland R, Breivik R, Lovgren A, Ulberg R (2021)
Mechanisms of change and heterogeneous treatment effects in psychodynamic and cognitive behavioural therapy for patients with depressive disorder: a randomized controlled trial
BMC Psychol., 9 (1), 11
DOI 10.1186/s40359-021-00517-6

Publications 2020

Jacobsen HB, Klungsoyr O, Landro NI, Stiles TC, Roche BT (2020)
MINDflex Training for Cognitive Flexibility in Chronic Pain: A Randomized, Controlled Cross-Over Trial
Front. Psychol., 11, 604832
DOI 10.3389/fpsyg.2020.604832

Jansen A, Berg JP, Klungsoyr O, Muller MHB, Lyche JL, Aaseth JO (2020)
The Influence of Persistent Organic Pollutants on Thyroidal, Reproductive and Adrenal Hormones After Bariatric Surgery
Obes. Surg., 30 (4), 1368-1378
DOI 10.1007/s11695-019-04273-w

Publications 2019

Chahal-Kummen M, Blom-Hogestol IK, Eribe I, Klungsoyr O, Kristinsson J, Mala T (2019)
Abdominal pain and symptoms before and after Roux-en-Y gastric bypass
BJS Open, 3 (3), 317-326
DOI 10.1002/bjs5.50148

Hanvold SE, Vinknes KJ, Loken EB, Hjartaker A, Klungsoyr O, Birkeland E, Risstad H, Gulseth HL, Refsum H, Aas AM (2019)
Does Lifestyle Intervention After Gastric Bypass Surgery Prevent Weight Regain? A Randomized Clinical Trial
Obes. Surg., 29 (11), 3419-3431
DOI 10.1007/s11695-019-04109-7

Jansen A, Muller MHB, Gronnestad R, Klungsoyr O, Polder A, Skjerve E, Aaseth J, Lyche JL (2019)
Decreased plasma levels of perfluoroalkylated substances one year after bariatric surgery
Sci. Total Environ., 657, 863-870
DOI 10.1016/j.scitotenv.2018.11.453

Publications 2017

Evensen S, Ueland T, Lystad JU, Bull H, Klungsoyr O, Martinsen EW, Falkum E (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
Nord. J. Psychiatr., 71 (3), 180-187
DOI 10.1080/08039488.2016.1247195

Falkum E, Klungsoyr O, Lystad JU, Bull HC, Evensen S, Martinsen EW, Friis S, Ueland T (2017)
Vocational rehabilitation for adults with psychotic disorders in a Scandinavian welfare society
BMC Psychiatry, 17, 24
DOI 10.1186/s12888-016-1183-0

Klungsoyr O, Antonsen B, Wilberg T (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, 17, 210
DOI 10.1186/s12888-017-1365-4

Leinonen MK, Campbell S, Klungsoyr O, Lonnberg S, Hansen BT, Nygard M (2017)
Personal and provider level factors influence participation to cervical cancer screening: A retrospective register-based study of 1.3 million women in Norway
Prev. Med., 94, 31-39
DOI 10.1016/j.ypmed.2016.11.018

Publications 2016

Johansen MS, Normann-Eide E, Normann-Eide T, Klungsoyr O, Kvarstein E, Wilberg T (2016)
RELATIONSHIP BETWEEN AFFECT CONSCIOUSNESS AND PERSONALITY FUNCTIONING IN PATIENTS WITH PERSONALITY DISORDERS: A PROSPECTIVE STUDY
J. Pers. Disord., 30 (5), 633-652

Publications 2015

Lorentzen S, Fjeldstad A, Ruud T, Marble A, Klungsoyr O, Ulberg R, Hoglend PA (2015)
The Effectiveness of Short- and Long-Term Psychodynamic Group Psychotherapy on Self-Concept: Three Years Follow-Up of a Randomized Clinical Trial
Int. J. Group Psychother., 65 (3), 363-385

Publications 2014

Antonsen BT, Klungsoyr O, Kamps A, Hummelen B, Johansen MS, Pedersen G, Urnes O, Kvarstein EH, Karterud S, Wilberg T (2014)
Step-down versus outpatient psychotherapeutic treatment for personality disorders: 6-year follow-up of the Ulleval personality project
BMC Psychiatry, 14, 119
DOI 10.1186/1471-244X-14-119

Fredriksen M, Dahl AA, Martinsen EW, Klungsoyr O, Faraone SV, Peleikis DE (2014)
Childhood and persistent ADHD symptoms associated with educational failure and long-term occupational disability in adult ADHD
ADHD-Attend. Deficit Hyperact. Disord., 6 (2), 87-99
DOI 10.1007/s12402-014-0126-1

Fredriksen M, Dahl AA, Martinsen EW, Klungsoyr O, Haavik J, Peleikis DE (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
Eur. Neuropsychopharmacol., 24 (12), 1873-1884
DOI 10.1016/j.euroneuro.2014.09.013

Jordbru AA, Smedstad LM, Klungsoyr O, Martinsen EW (2014)
PSYCHOGENIC GAIT DISORDER: A RANDOMIZED CONTROLLED TRIAL OF PHYSICAL REHABILITATION WITH ONE-YEAR FOLLOW-UP
J. Rehabil. Med., 46 (2), 181-187
DOI 10.2340/16501977-1246

Publications 2013

Bakali JV, Wilberg T, Klungsoyr O, Lorentzen S (2013)
Development of Group Climate in Short- and Long-Term Psychodynamic Group Psychotherapy
Int. J. Group Psychother., 63 (3), 367-393

Klungsoyr O, Sexton J, Sandanger I, Nygard JF (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)
J. Appl. Stat., 40 (4), 843-861
DOI 10.1080/02664763.2012.756859

Larsson S, Aas M, Klungsoyr O, Agartz I, Mork E, Steen NE, Barrett EA, Lagerberg TV, Rossberg JI, Melle I, Andreassen OA, Lorentzen S (2013)
Patterns of childhood adverse events are associated with clinical characteristics of bipolar disorder
BMC Psychiatry, 13, 97
DOI 10.1186/1471-244X-13-97

Publications 2012

Gullestad FS, Wilberg T, Klungsoyr O, Johansen MS, Urnes O, Karterud S (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
Psychother. Res., 22 (4), 426-441
DOI 10.1080/10503307.2012.662608

Publications 2010

Engh JA, Friis S, Birkenaes AB, Jonsdottir H, Klungsoyr O, Ringen PA, Simonsen C, Vaskinn A, Opjordsmoen S, Andreassen OA (2010)
Delusions Are Associated With Poor Cognitive Insight in Schizophrenia
Schizophr. Bull., 36 (4), 830-835
DOI 10.1093/schbul/sbn193

Rossberg JI, Johannessen JO, Klungsoyr O, Opjordsmoen S, Evensen J, Fjell A, Haahr U, Joa I, Langeveld J, Larsen TK, Melle I, Rund BR, Simonsen E, ten Velden W, Vaglum P, Friis S, McGlashan T (2010)
Are multi family groups appropriate for patients with first episode psychosis? A 5-year naturalistic follow-up study
Acta Psychiatr. Scand., 122 (5), 384-394
DOI 10.1111/j.1600-0447.2010.01571.x

Publications 2009

Klungsoyr O, Nygard M, Skare G, Eriksen T, Nygard JF (2009)
Validity of self-reported Pap smear history in Norwegian women
J. Med. Screen., 16 (2), 91-97
DOI 10.1258/jms.2009.008087

Klungsoyr O, Sexton J, Sandanger I, Nygard JF (2009)
Sensitivity analysis for unmeasured confounding in a marginal structural Cox proportional hazards model
Lifetime Data Anal., 15 (2), 278-294
DOI 10.1007/s10985-008-9109-x

Nygard JF, Klungsoyr O, Sandanger I, Svensson E (2009)
Selection effects in psychiatric epidemiology
Soc. Psychiatry Psychiatr. Epidemiol., 44 (10), 881-886
DOI 10.1007/s00127-009-0010-z

Publications 2008

Klungsøyr O (2008)
On causal inference in psychiatric epidemiology: methodological issues, illustrated by an association between cigarette smoking and depression in a Norwegian communitysample
In Series of dissertations submitted to the Faculty of Medicine, University of Oslo, Unipub, Oslo, no. 648, 1 b. (flere pag.)
BIBSYS 08109227x, ISBN 978-82-8072-263-8

Publications 2006

Klungsoyr O, Nygard JF (2006)
Re: "Cigarette smoking and incidence of first depressive episode: An 11-year, population-based follow-up study" - Two of the authors reply
Am. J. Epidemiol., 164 (9), 919-920
DOI 10.1093/aje/kwj307

Klungsoyr O, Nygard JF, Sorensen T, Sandanger I (2006)
Cigarette smoking and incidence of first depressive episode: An 11-year, population-based follow-up study
Am. J. Epidemiol., 163 (5), 421-432
DOI 10.1093/aje/kwj058

Publications 2002

Klungsøyr O (2002)
Lineære modeller: av høyeste rang
In Notater, Statistisk sentralbyrå, [Oslo], 2002/54, 74 s.
BIBSYS 022275169

Publications 2001

Klungsøyr O (2001)
Ekstremverdimodell for industrinæringenes investeringer i90-årene
In Notater, Statistisk sentralbyrå, [Oslo], 2001/14, 29 s.
BIBSYS 010577211

Klungsøyr O (2001)
Markovkjede Monte Carlo i varianskomponentmodell for sysselsettingsdata
In Notater, Statistisk sentralbyrå, [Oslo], 2001/15, 29 s.
BIBSYS 010577246

Klungsøyr O (2001)
Sesongjustering av tidsserier: spektralanalyse og filtrering
In Notater, Statistisk sentralbyrå, [Oslo], 2001/54, 46 s.
BIBSYS 011713240

Publications 2000

Klungsøyr O (2000)
Sammenligning av mikroformler for prisindekser og modelltilpasning
In Notater, Statistisk sentralbyrå, [Oslo], 2000/52, 35 s.
BIBSYS 001229761

Publications 1998

Zhang LC, Klungsøyr O (1998)
Med orden på data: estimering av terminvise omsetningstall
In Notater, Statistisk sentralbyrå, [Oslo], 98/76, 21 s.
BIBSYS 982560699

Publications 1991

Klungsøyr O (1991)
Simulering og estimering av tidsavhengig poisson-prosess med periodisk varierende parameter
[O. Klungsøyr], Oslo, 140 s.
BIBSYS 910196605