Reader opinion piece

• Kjelby, Eirik; Gjestad, Rolf; Fathian, Farivar et al. (2024). Reply to a Letter to the Editors From Dr de Souza and colleagues: "Unraveling the Optimal Treatment Approach for Depression in Schizophrenia Spectrum: A Quest for Clarity". (external link)
• Larsen, Tor Ketil (2017). Re: Psykiatriens indre konflikter eksponert. (external link)
• Larsen, Tor Ketil (2015). Re: Flere og gale diagnoser med kriteriebasert diagnostikk :. (external link)
• Larsen, Tor Ketil (2014). T.K. Larsen svarer. (external link)
• Larsen, Tor Kjetil; Hustoft, Ketil (2002). Psykiatri og kompetanse. (external link)

Academic article

• Drosos, Petros; Johnsen, Erik; Bartz-Johannessen, Christoffer et al. (2024). Remission in schizophrenia spectrum disorders: A randomized trial of amisulpride, aripiprazole and olanzapine. (external link)
• Gohar, Sherif Mostafa Mohamed Ahmed; Hegelstad, Wenche; Auestad, Bjørn Henrik et al. (2023). Association between early suicidal trajectories in first-episode psychosis and 10-year follow-up: TIPS registry-linked study. (external link)
• Kjelby, Eirik; Gjestad, Rolf; Fathian, Farivar et al. (2023). Antidepressive Effectiveness of Amisulpride, Aripiprazole, and Olanzapine in Patients with Schizophrenia Spectrum Disorders: A Secondary Outcome Analysis of a Pragmatic, Randomized Trial (BeSt InTro). (external link)
• Hoprekstad, Gunnhild Eldhuset; Kjelby, Eirik; Gjestad, Rolf et al. (2023). Depression trajectories and cytokines in schizophrenia spectrum disorders - A longitudinal observational study. (external link)
• Drosos, Petros; Johnsen, Erik; Bartz-Johannessen, Christoffer et al. (2022). Trajectories of response in schizophrenia-spectrum disorders: A one-year prospective cohort study of antipsychotic effectiveness. (external link)
• Mørkved, Nina; Johnsen, Erik; Kroken, Rune Andreas et al. (2022). Impact of childhood trauma on antipsychotic effectiveness in schizophrenia spectrum disorders: A prospective, pragmatic, semi-randomized trial. (external link)
• Hustoft, Kjetil; Larsen, Tor Ketil; Brønnick, Kolbjørn Kallesten et al. (2022). Psychiatric patients’ attitudes towards being hospitalized: a national multicentre study in Norway. (external link)
• Fathian, Farivar; Gjestad, Rolf; Kroken, Rune Andreas et al. (2022). Association between C-reactive protein levels and antipsychotic treatment during 12 months follow-up period after acute psychosis. (external link)
• Hoekstra, Sanne; Bartz-Johannessen, Christoffer; Sinkeviciute, Igne et al. (2021). Sex differences in antipsychotic efficacy and side effects in schizophrenia spectrum disorder: results from the BeSt InTro study. (external link)
• Larsen, Jeanette Brun; Reitan, Solveig Merete Klæbo; Løberg, Else-Marie et al. (2021). The association between cytokines and psychomotor speed in a spectrum of psychotic disorders: A longitudinal study. (external link)
• Ottesen, Akiah; Hegelstad, Wenche; Joa, Inge et al. (2021). Childhood trauma, antipsychotic medication, and symptom remission in first-episode psychosis. (external link)
• Drosos, Petros; Brønnick, Kolbjørn Kallesten; Joa, Inge et al. (2020). One-year outcome and adherence to pharmacological guidelines in first-episode schizophrenia: Results from a consecutive cohort study. (external link)
• Johnsen, Erik; Kroken, Rune Andreas; Løberg, Else-Marie et al. (2020). Amisulpride, aripiprazole, and olanzapine in patients with schizophrenia-spectrum disorders (BeSt InTro): a pragmatic, rater-blind, semi-randomised trial. (external link)
• Weibell, Melissa Anne E; Johannessen, Jan Olav; Auestad, Bjørn Henrik et al. (2019). Early substance use cessation improves cognition-10 years outcome in first-episode psychosis patients. (external link)
• Kvig, Erling Inge; Moe, Cathrine Fredriksen; Brinchmann, Beate et al. (2019). Negotiating the boundaries of psychosis: A qualitative study of the service provider perspective on treatment delay in community mental health. (external link)
• Gardsjord, Erlend Strand; Romm, Kristin Lie; Røssberg, Jan Ivar et al. (2018). Depression and functioning are important to subjective quality of life after a first episode psychosis. (external link)
• Bjørnestad, Jone Ravndal; Veseth, Marius; Davidson, Larry et al. (2018). Psychotherapy in psychosis: Experiences of fully recovered service users. (external link)
• Gardsjord, Erlend Strand; Romm, Kristin Lie; Røssberg, Jan Ivar et al. (2017). Is going into stable symptomatic remission associated with a more positive development of life satisfaction? A 10-year follow-up study of first episode psychosis. (external link)
• Hanevik, Hilde; Hestad, Knut; Lien, Lars et al. (2017). Religiousness in First-Episode Psychosis. (external link)
• Weibell, Melissa Anne; Hegelstad, Wenche; Auestad, Bjørn Henrik et al. (2017). The Effect of Substance Use on 10-Year Outcome in First-Episode Psychosis. (external link)
• Kvig, Erling Inge; Brinchmann, Beate; Moe, Cathrine Fredriksen et al. (2017). Geographical accessibility and duration of untreated psychosis: Distance as a determinant of treatment delay. (external link)
• Bjørnestad, Jone Ravndal; Hegelstad, Wenche; Joa, Inge et al. (2017). "With a little help from my friends" social predictors of clinical recovery in first-episode psychosis. (external link)
• Kvig, Erling Inge; Brinchmann, Beate; Moe, Cathrine Fredriksen et al. (2017). "Lanthanic Presentation" in first-episode psychosis predicts long service delay: the challenge of detecting masked psychosis. (external link)
• Hustoft, Kjetil; Larsen, Tor Ketil; Brønnick, Kolbjørn Selvåg et al. (2017). Voluntary or involuntary acute psychiatric hospitalization in Norway: A 24 h follow up study. (external link)
• Melle, Ingrid; Johannessen, Jan Olav; Haahr, Ulrik H. et al. (2017). Causes and predictors of premature death in first-episode schizophrenia spectrum disorders. (external link)
• Langeveld, Johannes H.; Bjørkly, Stål; Evensen, Julie Horgen et al. (2017). A 10-year follow-up study of violent victimization in first episode psychosis : risk and protective factors. (external link)
• Bjørnestad, Jone Ravndal; Davidson, Larry; Joa, Inge et al. (2017). Antipsychotic treatment: experiences of fully recovered service users. (external link)
• Haahr, Ulrik Helt; Larsen, Tor Ketil; Simonsen, Erik et al. (2016). Relation between premorbid adjustment, duration of untreated psychosis and close interpersonal trauma in first-episode psychosis. (external link)
• Gardsjord, Erlend Strand; Romm, Kristin Lie; Friis, Svein et al. (2016). Subjective quality of life in first-episode psychosis. A ten year follow-up study. (external link)
• Helle, Siri; Ringen, Petter Andreas; Melle, Ingrid et al. (2016). Cannabis use is associated with 3 years earlier onset of schizophrenia spectrum disorder in a naturalistic, multi-site sample (N = 1119). (external link)
• Rund, Bjørn Rishovd; Barder, Helene; Evensen, Julie Horgen et al. (2016). Neurocognition and Duration of Psychosis: A 10-year Follow-up of First-Episode Patients. (external link)
• Solesvik, Martine; Joa, Inge; Larsen, Tor Ketil et al. (2016). Visual Hallucinations in First-Episode Psychosis: Association with Childhood Trauma. (external link)
• Bjørnestad, Jone Ravndal; Joa, Inge; Larsen, Tor Ketil et al. (2016). "Everyone Needs a Friend Sometimes" - social predictors of long-term remission in first episode psychosis. (external link)
• Bay, Nina Angelika; Bjørnestad, Jone Ravndal; Johannessen, Jan Olav et al. (2016). Obstacles to care in first-episode psychosis patients with a long duration of untreated psychosis. (external link)
• Hegelstad, Wenche; Brønnick, Kolbjørn Selvåg; Barder, Helene et al. (2016). Preventing poor vocational functioning in psychosis through early intervention. (external link)
• Bjørnestad, Jone Ravndal; Brønnick, Kolbjørn Selvåg; Davidson, Larry et al. (2016). The central role of self-agency in clinical recovery from first episode psychosis. (external link)
• Socanski, Dobrinko; Aurlien, Dag; Herigstad, Anita et al. (2015). Attention deficit/hyperactivity disorder and interictal epileptiform discharges: It is safe to use methylphenidate'. (external link)
• Austad, Gudrun; Joa, Inge; Johannessen, Jan Olav et al. (2015). Gender differences in suicidal behaviour in patients with first-episode psychosis. (external link)
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd et al. (2015). Ten year course of IQ in first-episode psychosis: relationship between duration of psychsis and long-term intellectual trajectories. (external link)
• Friis, Svein; Melle, Ingrid; Johannessen, Jan Olav et al. (2015). Early Predictors of Ten-Year Course in First-Episode Psychosis.. (external link)
• Sønmez, Nasrettin; Røssberg, Jan Ivar; Evensen, Julie Horgen et al. (2014). Depressive symptoms in first-episode psychosis: A 10-year follow-up study. (external link)
• Stain, Helen J.; Brønnick, Kolbjørn S; Hegelstad, Wenche et al. (2014). Impact of Interpersonal Trauma on the Social Functioning of Adults With First-Episode Psychosis. (external link)
• Hagen, Kristen; Solem, Stian; Larsen, Tor Ketil et al. (2014). Obsessive-compulsive disorder (OCD) in patients with first- episode psychosis (FEP): A prospective study. (external link)
• Hegelstad, Wenche; Joa, Inge; Barder, Helene et al. (2014). Variation in duration of untreated psychosis in an 18-year perspective. (external link)
• Gisselgård, Jens; Anda, Liss Gøril; Brønnick, Kolbjørn S et al. (2014). Verbal working memory deficits predict levels of auditory hallucination in first-episode psychosis. (external link)
• Langeveld, Johannes H.; Bjørkly, Stål; Auestad, Bjørn Henrik et al. (2014). Treatment and violent behavior in persons with first episode psychosis during a 10-year prospective follow-up study. (external link)
• Opsal, Anne; Kristensen, Øistein; Larsen, Tor Ketil et al. (2013). Factors associated with involuntary admissions among patients with substance use disorders and comorbidity: a cross-sectional study. (external link)
• Weibell, Melissa Anne E.a; Joa, Inge; Bramness, Jørgen Gustav et al. (2013). Treated incidence and baseline characteristics of substance induced psychosis in a Norwegian catchment area. (external link)
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd et al. (2013). Neurocognitive development in first episode psychosis 5 years follow-up: associations between illness severity and cognitive course. (external link)
• Hegelstad, Wenche; Haahr, Ulrik; Larsen, Tor Ketil et al. (2013). Early detection, early symptom progression and symptomatic remission after ten years in a first episode of psychosis study. (external link)
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd et al. (2013). Ten year neurocognitive trajectories in first-episode psychosis. (external link)
• Hagen, Kristen; Hansen, Bjarne; Joa, Inge et al. (2013). Prevalence and clinical characteristics of patients with obsessive-compulsive disorder in first-episode psychosis. (external link)
• Hustoft, Kjetil; Larsen, Tor Ketil; Auestad, Bjørn Henrik et al. (2013). Predictors of involuntary hospitalizations to acute psychiatry. (external link)
• Socanski, Dobrinko; Aurlien, Dag; Herigstad, Anita et al. (2013). Epilepsy in a large cohort of children diagnosed with attention deficit/hyperactivity disorders (ADHD). (external link)
• Langeveld, Johannes H.; Andreassen, Ole Andreas; Auestad, Bjørn Henrik et al. (2013). Is there an optimal factor structure of the Positive and Negative Syndrome Scale in patients with first-episode psychosis?. (external link)
• Evensen, Julie Horgen; Røssberg, Jan Ivar; Barder, Helene et al. (2012). Apathy in first episode psychosis patients: A ten year longitudinal follow-up study. (external link)
• Evensen, Julie Horgen; Røssberg, Jan Ivar; Barder, Helene et al. (2012). Flat affect and social functioning: A 10 year follow-up study of first episode psychosis patients. (external link)
• Langeveld, Johannes H.; Joa, Inge; Friis, Svein et al. (2012). A Comparison of Adolescent and Adult Onset First-Episode Non Affective Psychosis: 2-year Follow-up:. (external link)
• Dieset, Ingrid; Djurovic, Srdjan; Tesli, Martin Steen et al. (2012). Up-Regulation of NOTCH4 Gene Expression in Bipolar Disorder. (external link)
• Haahr, Ulrik; Simonsen, Erik; Røssberg, Jan Ivar et al. (2012). Patient satisfaction with treatment in first-episode psychosis. (external link)
• Hegelstad, Wenche; Larsen, Tor Kjetil; Auestad, Bjørn Henrik et al. (2012). Long-Term Follow-Up of the TIPS Early Detection in Psychosis Study: Effects on 10-Year Outcome. (external link)
• Stain, Helen J.; Hodne, Sigrun; Joa, Inge et al. (2012). The relationship of verbal learning and verbal fluency with written story production: Implications for social functioning in first episode psychosis. (external link)
• Opsal, Anne; Clausen, Thomas; Kristensen, Øistein et al. (2011). Involuntary hospitalization of first-episode psychosis with substance abuse during a 2-year follow-up. (external link)
• Langeveld, Hans; Joa, Inge; Larsen, Tor Ketil et al. (2011). Teachers' awareness for psychotic symptoms in secondary school: the effects of an early detection programme and information campaign. (external link)
• Opsal, Anne; Kristensen, Øistein; Ruud, Torleif et al. (2011). Substance abuse inpatients admitted voluntarily and involuntarily to acute psychiatric wards: a national cross-sectional study. (external link)
• Tandberg, Marte; Ueland, Toril; Sundet, Kjetil Søren et al. (2011). Neurocognition and occupational functioning in patients with first-episode psychosis: a 2-year follow-up study. (external link)
• Johannessen, Jan Olav; Joa, Inge; Auestad, Bjørn et al. (2011). First-episode psychosis patients recruited into treatment via early detection teams versus ordinary pathways: course and health service use during 5 years. (external link)
• Larsen, Tor Ketil; Melle, Ingrid; Auestad, Bjørn H. et al. (2011). Early detection of psychosis: positive effects on 5-year outcome. (external link)
• Evensen, Julie Horgen; Røssberg, Jan Ivar; Haahr, Ulrik et al. (2011). Contrasting monosymptomatic patients with hallucinations and delusions in first-episode psychosis patients: a five-year longitudinal follow-up study. (external link)
• Johannessen, Jan Olav; Joa, Inge; Auestad, Bjørn H. et al. (2010). First-episode psychosis patients recruited into treatment via early detection teams versus ordinary pathways: course and health service use during 5 years. (external link)
• Simonsen, E.; Friis, Svein; Ilner, Stein E. Opjordsmoen et al. (2010). Early identification of non-remission in first-episode psychosis in a two-year outcome study. (external link)
• Socanski, Dobrinko; Herigstad, Anita; Thomsen, Per Hove et al. (2010). Epileptiform abnormalities in children diagnosed with attention deficit/hyperactivity disorder. (external link)
• Johannessen, Jan Olav; Joa, Inge; Friis, Svein et al. (2010). First-episode psychosis patients recruited into treatment via early detection teams versus ordinary pathways: course, outcfome and health service use during 5 years follow-up. (external link)
• Melle, Ingrid; Røssberg, Jan Ivar; Joa, Inge et al. (2010). The development of subjective quality of life in first-episode psychosis - a two year follow-up study. (external link)
• Ilner, Stein E. Opjordsmoen; Friis, Svein; Melle, Ingrid et al. (2010). A 2-year follow-up of involuntary admission's influence upon adherence and outcome in first-episode psychosis. (external link)
• Melle, Ingrid; Johannessen, Jan Olav; Friis, Svein et al. (2010). Course and predictors of suicidality over the first two years of treatment in first-episode schizophrenia spectrum psychosis. (external link)
• Røssberg, Jan Ivar; Johannessen, Jan Olav; Klungsøyr, Ole et al. (2010). Are multi family groups appropriate for patients with first episode psychosis? A 5-year naturalistic follow-up study. (external link)
• Simon, Andor E.; Lester, Helen; Tait, Lynda et al. (2009). The International Study on General Practitioners and Early Psychosis (IGPS). (external link)
• Joa, Inge; Johannessen, Jan Olav; Langeveld, H et al. (2009). Baseline profiles of adolescent vs. adult-onset first-episode psychosis in an early detection program. (external link)
• Larsen, Tor Ketil; Joa, Inge; Langeveld, Johannes Hendrik et al. (2009). Optimizing health-care systems to promote early detection of psychosis. (external link)
• Ilner, Stein E. Opjordsmoen; Melle, Ingrid; Friis, Svein et al. (2009). Stability of medication in early psychosis: a comparison between second-generation and low-dose first-generation antipsychotics. (external link)
• Melle, Ingrid; Larsen, Tor Ketil; Haahr, Ulrik et al. (2008). Prevention of negative symptom psychopathologies in first-episode schizophrenia. (external link)
• Joa, Inge; Johannessen, Jan Olav; Auestad, Bjørn et al. (2008). The key to reducing duration of untreated first psychosis: Information campaigns. (external link)
• Simonsen, Erik; Haahr, Ulrik; Mortensen, Erik Lykke et al. (2008). Personality disorders in first episode psychosis. (external link)
• Haahr, U; Friis, Svein; Larsen, TK et al. (2008). First-episode psychosis: Diagnostic stability over one and two years. (external link)
• Joa, Inge; Johannessen, JO; Auestad, B et al. (2008). The Key to Reducing the Duration of Untreated First Psychosis: Information Campaigns. (external link)
• Rund, Bjørn Rishovd; Melle, Ingrid; Friis, Svein et al. (2007). The course of neurocognive functioning in first-episode psychosis and its relation to premorbid adjustment, duration of untreated psychosis, andrelapse. (external link)
• Larsen, TK; Melle, Ingrid; Friis, Svein et al. (2007). One-year effect of changing duration of untreated psychosis in a single catchment area. (external link)
• Simonsen, Erik; Friis, Svein; Haahr, Ulrik et al. (2007). Clinical epidemiologic first-episode psychosis. (external link)
• Joa, Inge; Johannessen, Jan Olav; Auestad, Bjørn H et al. (2007). Effects on referral patterns of reducing intensive informational campaigns about first-episoe psychosis. (external link)
• Johannessen, Jan Olav; Friis, Svein; Joa, Inge et al. (2007). First-episode psychosis patients recruited into treatment via early detection teams versuss ordinary pathways: course, outcome and health service use during first 2 years. (external link)
• Simonsen, E; Friis, S; Haahr, U et al. (2007). Clinical epidemiologic first-episode psychosis: 1-year outcome and predictors. (external link)
• Larsen, Tor K.; Melle, Ingrid; Auestad, B et al. (2006). Substance abuse in first-episode non-affective psychosis. (external link)
• Larsen, TK; Melle, I; Auestad, B et al. (2006). Early detection of first-episode psychosis: The effect on 1-year outcome. (external link)
• Melle, Ingrid; Johannesen, JO; Friis, Svein et al. (2006). Early detection of the first episode of schizophrenia and suicidal behavior. (external link)
• Melle, Ingrid; Haahr, Ulrik; Friis, Svein et al. (2005). Reducing the duration of untreated first-episode psychosis - effects on baseline social functioning and quality of life. (external link)
• Melle, Ingrid; Friis, Svein; Haahr, Ulrik et al. (2005). Measuring quality of life in first-episode psychosis. (external link)
• Friis, Svein; Vaglum, Per Jørgen Wiggen; Haahr, U et al. (2005). Effect of an early detection programme on duration of untreated psychosis - Part of the Scandinavian TIPS study. (external link)
• Johannessen, JO; Larsen, Tor Kjetil; Melle, Ingrid et al. (2005). Pathways to care for first-episode psychosis in an early detection healthcare sector - Part of the Scandinavian TIPS study. (external link)
• Skodol, AE; Oldham, JM; Bender, DS et al. (2005). Dimensional representations of DSM-IV personality disorders: relationships to functional impairment. (external link)
• Rund, Bjørn Rishovd; Melle, Ingrid; Friis, Svein et al. (2004). Neurocognitive dysfunction in first-episode psychosis: Correlates with symptoms, premorbid adjustment and duration of untreated psychosis. (external link)
• Melle, Ingrid; Larsen, Tor Ketil (2004). Reducing the duration of untreated psychosis in first episode psychosis: effects on clinical presentation. (external link)
• Friis, Svein; Melle, Ingrid; Larsen, Tor Ketil et al. (2004). Does duration of untreated psychosis bias study samples of first-episode psychosis?. (external link)
• Friis, Svein; Melle, Ingrid; Larsen, Tor Ketil (2004). Does duration of untreated psychosis bias study samples of first episode psychosis?. (external link)
• Larsen, Tor Ketil; Friis, Svein; Haahr, U. et al. (2004). Premorbid adjustment in first episode non-affective psychosis: Distinct patterns of course to onset. (external link)
• Melle, Ingrid; Larsen, Tor ketil; Haahr, Ulrik et al. (2004). Reducing the duration of untreated first-episode psychosis: effects on clinical presentation. (external link)
• Rund, Bjørn Rishovd; Melle, Ingrid; Friis, Svein et al. (2004). Neurocognitive dysfunction in first-episode psychosis: Correlates with symptoms, premorbid adjustment, and duration of untreated psychosis. (external link)
• Friis, Svein; Larsen, Tor Kjetil; Melle, Ingrid (2003). Behandling av psykoser. (external link)
• Friis, Svein; Larsen, Tor Kjetil (2002). Har individuell psykoterapi noen plass i behandlingen av schizofreni?. (external link)
• Horneland, Marthe; Vaglum, Per; Larsen, Tor Kjetil (2002). The prevalence of DSM-III-R "prodromal" symptoms of schizophrenia in non-psychotic psychiatric outpatients. (external link)
• Larsen, Tor Kjetil (2002). Tidlig påvisning av schizofreni ¿ er primærprofylakse mulig?. (external link)
• Heinimaa, Markus; Larsen, Tor Kjetil (2002). Conceptual and ethical aspects of early diagnosis and intervention. (external link)
• Johannessen, J.O.; McGlashan, T.H.; Larsen, Tor Ketil et al. (2001). Early Detection Strategies for Untreated First Psychosis. (external link)
• Larsen, Tor Ketil; Johannessen, J.O.; McGlashan, T.H. et al. (2001). Reducing Duration of Untreated First Psychosis: Changes in Patient Characteristics at Presentation. (external link)
• Larsen, Tor Ketil; Friis, Svein; Haahr, U. et al. (2001). Early detection and intervention in first-episode schizophrenia: A critical review. (external link)
• Joa, Inge; Larsen, Tor Kjetil; Johannessen, Jan Olav et al. (2001). Oppdages psykiske lidelser tidlig, er de enklere å behandle. En presentasjon av TIPS prosjektet. (external link)
• Larsen, Tor Kjetil; Moe, Lars C.; Vibe-Hansen, Lars et al. (2000). Premorbid functioning versus duration of untreated psychosis in 1 year outcome in first-rpisode psychosis. (external link)
• Johannessen, Jan Olav; Larsen, Tor Kjetil (2000). Tilbakefallsprosent som kvalitetsmål i psykiatrisk behandling. (external link)
• Larsen, Tor Kjetil; Johannessen, Jan Olav; Guldberg, Cato et al. (1999). Early intervention programs in first-episode psychosis and reduction of duration of untreated psychosis (DUP). (external link)
• Larsen, Tor Kjetil; Johannessen, Jan Olav; Opjordsmoen, Stein (1998). First episode schizophrenia with long duration of untreated psychosis. Pathways to care. (external link)
• Larsen, Tor Kjetil; Johannessen, Jan Olav; Opjordsmoen, Stein (1998). First-episode schizophrenia with long duration of untreated psychosis. Pathways to care. (external link)
• Larsen, Tor Kjetil; Opjordsmoen, Stein (1996). Early identification and treatment of schizophrenbia: Conceptual and ethical considerations. (external link)
• Larsen, Tor Kjetil; McGlashan, Thomas H.; Johannessen, Jan Olav et al. (1996). First-episode schizophrenia: II Premorbid patterns by gender. (external link)
• Larsen, Tor Kjetil; McGlashan, Thomas H.; Moe, Lars C. (1996). First episode Schizophrenia: I. Early course parameters. (external link)

Doctoral dissertation

• Socanski, Dobrinko; Larsen, Tor Ketil (2016). Attention deficit/hyperactivity disorder and occurrence of epilepsy, interictal epileptiform discharges and two years follow-up in children. (external link)
• Opsal, Anne; Clausen, Thomas; Larsen, Tor Ketil (2013). Involuntarily admitted patients with substance use disorders. (external link)
• Larsen, Tor Kjetil (1999). First episode of non-affective psychosis. A study of conceptual and ethical considerations, premorbid functioning, duration of untreated psychosis and clinical outcome. (external link)
• Larsen, Tor Kjetil (1999). First episode of non-affective psychosis: a study of conceptual and ethical considerations, premorbid functioning, duration of untreated psychosis and clinical outcome. (external link)

Academic lecture

• Hagen, Kristen; Hansen, Bjarne; Joa, Inge et al. (2013). Tvangslidelse hos pasienter med førstegangspsykose - prevalens og kliniske karakteristika. (external link)
• Hagen, Kristen; Hansen, Bjarne; Joa, Inge et al. (2013). Obsessive compulsive disorder in patients with OCD- prevalsende and clinical caracteristica. (external link)
• Larsen, Tor Ketil (2005). Workshop regarding early intervention in psychosis at the conference of Preventive psychiatry. (external link)
• Larsen, Tor Ketil (2001). Early Intervention in Psychosis; the TIPS-project. (external link)
• Larsen, Tor Ketil (2001). Early intervention in psychosis. 4 lectures. (external link)
• Larsen, Tor Ketil (2001). The rationale for early intervention in psychosis. (external link)
• Larsen, Tor Ketil (2001). Early intervention in psychosis; when and how?. (external link)
• Larsen, Tor Ketil (2001). Early Intervention and Prevention of Psychosis in Norway. (external link)
• Larsen, Tor Ketil (2001). Reducing Duration of Untreated Psychosis; The TIPS historical control study. (external link)
• Larsen, Tor Ketil (2001). 20 lectures on the topic of "Early intervention of psychosis and the implementation of clinical programmes for early detection of psychosis". (external link)
• Opjordsmoen, Stein; Rund, Bjørn Rishovd; Melle, Ingrid et al. (2001). TIPS: Stability of cognitive functioning in patients with first-episode psychosis. (external link)
• Melle, Ingrid; Opjordsmoen, Stein; Larsen, Tor Kjetil et al. (2001). TIPS study: Duration of untreated psychosis and baseline clinical severity in first-episode psychosis. (external link)
• Larsen, Tor Kjetil (2001). Early Intervention and Prevention of Psychosis in Norway. (external link)
• Larsen, Tor Kjetil (2001). Reducing Duration of Untreated Psychosis; the TIPS historical control study. (external link)
• Larsen, Tor Kjetil (2001). Early Intervention in Psychosis; the TIPS-project. (external link)
• Larsen, Tor Kjetil (2001). Tidlig intervensjon ved psykose. (external link)
• Larsen, Tor Kjetil (2001). 20 lectures on the topic of early intervention of psychosis and the implementation of clinical programmes for early detection of psychosis. (external link)
• Larsen, Tor Kjetil (2001). Grunnlaget for tidlig intervensjon ved psykose. (external link)
• Larsen, Tor Kjetil (2001). Tidlig intervensjon ved psykose; når og hvordan?. (external link)
• Larsen, Tor Kjetil (2001). Foredrag om TIPS-prosjektet. (external link)
• Larsen, Tor Kjetil (2001). Stand-up forsker på kafeen "Sting". (external link)
• Larsen, Tor Ketil (2001). 30 min. lecture about the TIPS-project. (external link)
• Melle, Ingrid; Opjordsmoen, Stein; Larsen, Tor Kjetil et al. (2001). Duration of untreated psychosis and baseline clinical severity in first-episode psychosis. (external link)
• Johannessen, Jan Olav; Larsen, Tor Kjetil; Horneland, Marthe et al. (1999). Strategies for reducing duration of untreated psychosis. (external link)

Abstract

• Hustoft, Kjetil; Johannessen, Jan Olav; Larsen, Tor Ketil et al. (2012). Psychiatric ambulance - A new feature in the psychiatric emergency care. (external link)
• Hegelstad, Wenche; Larsen, Tor Ketil; Evensen, Julie Horgen et al. (2012). Long-term follow-up of the TIPS early detection in psychosis study: effects on 10-year outcome. (external link)
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd et al. (2012). Neurocognitive development in first-episode psychosis 5-year follow-up: associations between illness severity and cognitive course. (external link)
• Hustoft, Kjetil; Larsen, Tor Ketil; Auestad, Bjørn Henrik et al. (2012). Predictors of involuntary hospitalizations to acute psychiatry. (external link)
• Simonsen, Erik; Haahr, Ulrik; Evensen, Julie Horgen et al. (2012). Recovery at 10 years in first-episode psychosis. (external link)
• Drosos, Petros; Larsen, Tor Ketil; Joa, Inge (2012). Use of clozapine in first-episode psychoses; Experiences from TIPS-II Project. (external link)
• Gisselgård, Jens; Larsen, Tor Ketil; Brønnick, Kolbjørn S et al. (2012). Cognitive correlates of auditory hallucinations in first episode psychosis. (external link)
• Joa, Inge; Larsen, Tor Ketil; Skryten, Lill Kjersti et al. (2012). Primary prevention of Psychosis (POP): a Norwegian UHR initiative. (external link)
• Hustoft, Kjetil; Larsen, Tor Ketil; Auestad, Bjørn Henrik et al. (2012). Predictors of involuntary hospitalizations to acute psychiatry. (external link)
• Kvig, Erling Inge; Brinchmann, Beate; Moe, Cathrine et al. (2012). Determinants of the duration of untreated psychosis (DUP) in rural Norway: an examination of the causes of treatment delay in rural mental health services. (external link)
• Langeveld, Johannes H.; Joa, Inge; Johannessen, Jan Olav et al. (2012). Characteristic of first-episode psychosis patients reporting violent/threatening behavior. (external link)
• Haahr, Ulrik; Larsen, Tor Ketil; Simonsen, Erik et al. (2012). The relation between trauma and clinical factors in first-episode psychosis: Results from the TIPS study. (external link)
• Hatloey, K.; Joa, Inge; Larsen, Tor Ketil et al. (2012). Students' awareness for psychotic symptoms in secondary school; The effects of an early detection program and information campaign. (external link)
• Joa, Inge; Weibel, M.; Johannessen, Jan Olav et al. (2011). SUBSTANCE MISUSE AND FIRST EPISODE PSYCHOSIS, A STUDY OF ASSOCIATED RISKS. (external link)
• Tandberg, Marte; Ueland, Toril; Sundet, Kjetil Søren et al. (2011). NEUROCOGNITION AND OCCUPATIONAL FUNCTIONING IN PATIENTS WITH FIRST EPISODE PSYCHOSIS: A 2-YEAR FOLLOW-UP STUDY. (external link)
• Melle, Ingrid; Evensen, Julie Horgen; Haahr, U. et al. (2011). Quality of life and recovery in psychotic disorders - 10 year follow-up of the tips study. (external link)
• Melle, Ingrid; Larsen, Tor Ketil; Friis, Svein et al. (2009). Early detection of first psychosis: tips sample five year outcomes. (external link)
• Melle, I; Rund, Bjørn Rishovd; Friis, S et al. (2006). Does neurocognitive functioning mediate the lack of relationship between subjective and objective quality of life?. (external link)
• Melle, I; Friis, S; Haahr, U et al. (2005). The development of quality of life in first episode psychosis. (external link)
• Rund, Bjørn Rishovd; Melle, I; Friis, S et al. (2005). What predicts the course of neurocognitive functioning in first-episode psychosis?. (external link)
• Larsen, Tor Kjetil; Vaglum, Per Jørgen Wiggen; Friis, Svein et al. (2004). Drug abuse in first episode non-affective psychosis. (external link)
• Rund, Bjørn Rishovd; Melle, Ingrid; Friis, Svein et al. (2004). Is there an association between duration of untreated psychosis (DUP) and neurocognitive performance at admission?. (external link)
• Melle, Ingrid; Rund, Bjørn Rishovd; Friis, Svein et al. (2004). No decline in neurocognitive functioning from baseline to 1-year follow-up in first-episode psychosis. (external link)
• Larsen, Tor Ketil (2004). Tracking the use of novel and low dose traditional antipsychotics in first episode psychosis. (external link)
• Larsen, Tor Ketil (2004). One year outcome in first episode non-affective psychosis - earlier vs later detection. (external link)
• Larsen, Tor Ketil (2004). No decline in neurocognitive functioning from baseline to 1-year follow-up in first episode psychosis. (external link)

Editorial

• Friis, Svein; Barder, Helene; Evensen, Julie Horgen et al. (2012). The TIPS study and bias: Replies to Dr Amos. (external link)
• Fjell, A; Thorsen, GRB; Friis, Svein et al. (2007). Multifamily group treatment in a program for patients with first-episode psychosis: Experiences from the TIPS project. (external link)
• Larsen, Tor Ketil (2004). Kan vi forstå psykoser?. (external link)

Academic chapter/article/Conference paper

• Larsen, Tor Ketil (2009). Prevention and early intervention in psychsis. (external link)
• Larsen, Tor Kjetil; Johannessen, Jan Olav (2005). Relasjonenes betydning for hjelpsøkede atferd hos mennesker med tidlig psykose-symptomer. (external link)
• Larsen, Tor Kjetil (2005). Tidlig intervensjon ved schizofreni. (external link)
• Larsen, Tor Ketil (2005). The importance of human relations for the early detection of psychosis. (external link)
• Larsen, Tor Ketil (2005). Tidlig behandling av psykose. (external link)
• Larsen, Tor Ketil (2004). A critical discussion of the use of concepts in relation to early intervention in psychosis; Do we really know what we are?. (external link)
• Larsen, Tor Kjetil; Friis, Svein (2003). Psykososial behandling v schizofreni - noe å bry seg om?. (external link)
• Larsen, Tor Kjetil; Friis, Svein (2002). Psykososial behandling av schizofreni: noe å bry seg om?. (external link)
• Larsen, Tor Kjetil (2002). Early Intervention and prevention of psychosis in Norway. (external link)
• Johannessen, J.O.; Larsen, Tor Ketil; Horneland, M. et al. (2001). The TIPS project; a systematized program to reduce duration of untreated psychosis in first episode schizophrenia. (external link)
• Johannessen, Jan Olav; Larsen, Tor Kjetil; McGlashan, Thomas H. et al. (2000). Early intervention in psychosis:the TIPS project,a multi-centre study in Scandinavia. (external link)
• Larsen, Tor Kjetil; Johannessen, Jan Olav; McGlashan, Thomas H. et al. (2000). Can duration of untreated psychosis be reduced?. (external link)
• Johannessen, Jan Olav; Larsen, Tor Kjetil (2000). Early treatment and detection of functional psychosis; education programmes and early detection teams. (external link)
• Larsen, Tor Kjetil (2000). Conceptual and ethical aspects of early treatment in schizophrenia. (external link)

Textbook

• Jørgensen, Per; Larsen, Tor Kjetil; Rosenbaum, Bent (2000). Tidlig indsats ved skizofreni: udvikling og behandling. (external link)

See a complete overview of publications in Cristin.