Conference lecture

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

Academic article

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

Letter to the editor

• Tor Ketil Larsen (2015). Re: Flere og gale diagnoser med kriteriebasert diagnostikk :. (external link)
• Eirik Kjelby; Rolf Gjestad; Farivar Fathian 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)
• Tor Ketil Larsen (2014). T.K. Larsen svarer. (external link)
• Tor Ketil Larsen (2017). Re: Psykiatriens indre konflikter eksponert. (external link)
• Tor Kjetil Larsen; Ketil Hustoft (2002). Psykiatri og kompetanse. (external link)

Conference abstract

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

Textbook

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

Academic book chapter

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

Doctoral thesis (PhD)

• Dobrinko Socanski; Tor Ketil Larsen (2016). Attention deficit/hyperactivity disorder and occurrence of epilepsy, interictal epileptiform discharges and two years follow-up in children. (external link)
• Tor Kjetil Larsen (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)
• Anne Opsal; Thomas Clausen; Tor Ketil Larsen (2013). Involuntarily admitted patients with substance use disorders. (external link)
• Tor Kjetil Larsen (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)

Editorial/Leader article

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

See a complete overview of publications in Cristin.