Svein Friis

• Øvergaard, Kristin; Ørbeck, Beate; Friis, Svein; Pripp, Are Hugo; Aase, Heidi & Biele, Guido [Show all 9 contributors for this article] (2022). Attention-deficit/hyperactivity disorder from preschool to school age: change and stability of parent and teacher reports. European Child and Adolescent Psychiatry. ISSN 1018-8827. doi: 10.1007/s00787-022-02019-1. Full text in Research Archive
• Biele, Guido; Lekhal, Ratib; Øvergaard, Kristin Romvig; Wang, Mari Vaage; Brandlistuen, Ragnhild Eek & Friis, Svein [Show all 7 contributors for this article] (2022). The effect of special educational assistance in early childhood education and care on psycho-social difficulties in elementary school children. Child and Adolescent Psychiatry and Mental Health (CAPMH). ISSN 1753-2000. 16(1). doi: 10.1186/s13034-022-00442-5.
• Biele, Guido; Øvergaard, Kristin Romvig; Friis, Svein; Zeiner, Pål & Aase, Heidi (2022). Cognitive, emotional, and social functioning of preschoolers with attention deficit hyperactivity problems. BMC Psychiatry. ISSN 1471-244X. 22. doi: 10.1186/s12888-021-03638-9. Full text in Research Archive
• Ruud, Torleif & Friis, Svein (2021). Community-based Mental Health Services in Norway. Consortium Psychiatricum. ISSN 2712-7672. 2(1), p. 47–54. doi: 10.17816/CP43.
• Ottesen, Akiah; Hegelstad, Wenche; Joa, Inge; Opjordsmoen, Stein E.; Rund, Bjørn Rishovd & Røssberg, Jan Ivar [Show all 13 contributors for this article] (2021). Childhood trauma, antipsychotic medication, and symptom remission in first-episode psychosis. Psychological Medicine. ISSN 0033-2917. p. 1–10. doi: 10.1017/S003329172100427X. Full text in Research Archive
• Overgaard, Kristin Romvig; Ørbeck, Beate; Wagner, Karine; Friis, Svein; Øhre, Beate & Zeiner, Pål (2021). Youth with hearing loss: Emotional and behavioral problems and quality of life. International Journal of Pediatric Otorhinolaryngology. ISSN 0165-5876. 145. doi: 10.1016/j.ijporl.2021.110718.
• Vaskinn, Anja; Sundet, Kjetil; Melle, Ingrid; Andreassen, Ole A. & Friis, Svein (2021). The factor structure of social cognition in schizophrenia: Weak evidence for separable domains. Schizophrenia Research: Cognition. ISSN 2215-0013. 26, p. 1–4. doi: 10.1016/j.scog.2021.100208. Full text in Research Archive Show summary

  This study examined the factor structure of social cognition in a Norwegian sample of individuals diagnosed with schizophrenia (n = 83). Eight variables from three social cognitive tests from three theoretical domains were included: emotion processing, social perception and theory of mind. Factor analysis with maximum likelihood extraction and oblique rotation resulted in two factors using Kaiser's criterion. Although the two-factor model had better fit than a unifactorial model, it did not represent the data well. Two social cognitive variables did not load on either factor. The two extracted factors did not correspond to an expected distinction between low and high level of processing or between affective and cognitive processes. A non-negligible number of nonredundant residuals between observed and computed correlations suggested poor model fit. In conclusion, this study failed to identify separable dimensions of social cognition in spite of including measures from different theoretical domains.

• Øvergaard, Kristin Romvig; Ørbeck, Beate; Friis, Svein; Pripp, Are Hugo; Aase, Heidi & Zeiner, Pål (2021). Predictive validity of attention-deficit/hyperactivity disorder from ages 3 to 5 Years. European Child and Adolescent Psychiatry. ISSN 1018-8827. doi: 10.1007/s00787-021-01750-5. Full text in Research Archive Show summary

  We investigated to what extent parent-rated attention-deficit/hyperactivity disorder (ADHD) and impairment at age 3 years predicted elevated ADHD symptoms at age 5 years, and whether teacher-rated ADHD symptoms improved these predictions. This study is part of the longitudinal, population-based Norwegian Mother, Father and Child Cohort Study. Parents of 3-year-old children (n = 1195) were interviewed about ADHD and impairment, and teachers rated child ADHD symptoms by the Strengths and Difficulties Questionnaire or the Early Childhood Inventory-4. At 5 years of age, the children (n = 957) were classified as ADHD-positive or -negative using Conners’ Parent Rating Scale. Relying solely on parent-rated ADHD or impairment at age 3 years did moderately well in identifying children with persistent elevation of ADHD symptoms, but gave many false positives (positive predictive values (PPVs): .40–.57). A small group of children (n = 20, 13 boys) scored above cut-off on both parent-rated ADHD and impairment, and teacher-rated ADHD symptoms, although adding teacher-rated ADHD symptoms slightly weakened the predictive power for girls. For this small group, PPVs were .76 for boys and .64 for girls. Limiting follow-up to these few children will miss many children at risk for ADHD. Therefore, we recommend close monitoring also of children with parent-reported ADHD symptoms and/or impairment to avoid delay in providing interventions. Clinicians should also be aware that teachers may miss ADHD symptoms in preschool girls.

• Srihari, Vinod H.; Guloksuz, Sinan & Friis, Svein (2020). Natural History, Not Lead Time. American Journal of Psychiatry. ISSN 0002-953X. 177(12), p. 1185–1185. doi: 10.1176/appi.ajp.2020.20040402.
• Wedervang-Resell, Kirsten; Ueland, Thor; Aukrust, Pål; Friis, Svein; Holven, Kirsten Bjørklund & Johannessen, Cecilie Haggag [Show all 13 contributors for this article] (2020). Reduced levels of circulating adhesion molecules in adolescents with early-onset psychosis. Nature NPJ Schizophrenia. ISSN 2334-265X. 6, p. 1–8. doi: 10.1038/s41537-020-00112-5. Full text in Research Archive
• Wedervang-Resell, Kirsten; Friis, Svein; Lonning, Vera Louise Hiorth; Smelror, Runar; Johannessen, Cecilie Haggag & Agartz, Ingrid [Show all 10 contributors for this article] (2019). Lipid alterations in adolescents with early-onset psychosis may be independent of antipsychotic medication. Schizophrenia Research. ISSN 0920-9964. p. 1–7. doi: 10.1016/j.schres.2019.11.039. Full text in Research Archive
• Wedervang-Resell, Kirsten; Friis, Svein; Lonning, Vera Louise Hiorth; Smelror, Runar; Johannessen, Cecilie Haggag & Reponen, Elina Johanna [Show all 13 contributors for this article] (2019). Increased interleukin 18 activity in adolescents with early-onset psychosis is associated with cortisol and depressive symptoms. Psychoneuroendocrinology. ISSN 0306-4530. 112:104513, p. 1–7. doi: 10.1016/j.psyneuen.2019.104513. Full text in Research Archive
• Øvergaard, Kristin Romvig; Ørbeck, Beate; Friis, Svein; Biele, Guido; Pripp, Are Hugo & Aase, Heidi [Show all 7 contributors for this article] (2019). Screening With an ADHD-Specific Rating Scale in Preschoolers: A Cross-Cultural Comparison of the Early Childhood Inventory-4. Psychological Assessment. ISSN 1040-3590. 31(8), p. 985–994. doi: 10.1037/pas0000722.
• Weibell, Melissa Anne E; Johannessen, Jan Olav; Auestad, Bjørn Henrik; Bramness, Jørgen Gustav; Brønnick, Kolbjørn Kallesten & Haahr, Ulrik [Show all 17 contributors for this article] (2019). Early substance use cessation improves cognition-10 years outcome in first-episode psychosis patients. Frontiers in Psychiatry. ISSN 1664-0640. 10. doi: 10.3389/fpsyt.2019.00495. Full text in Research Archive
• Ferrara, Maria; Guloksuz, Sinan; Li, Fangyong; Burke, Shadie; Tek, Cenk & Friis, Svein [Show all 12 contributors for this article] (2019). Parsing the impact of early detection on duration of untreated psychosis (DUP): Applying quantile regression to data from the Scandinavian TIPS study. Schizophrenia Research. ISSN 0920-9964. 210, p. 128–134. doi: 10.1016/j.schres.2019.05.035.
• Øvergaard, Kristin Romvig; Madsen, Kathrine Bang; Ørbeck, Beate; Friis, Svein & Obel, Carsten (2018). The predictive validity of the Strengths and Difficulties Questionnaire for child attention-deficit/hyperactivity disorder. European Child and Adolescent Psychiatry. ISSN 1018-8827. 28(5), p. 625–633. doi: 10.1007/s00787-018-1226-9.
• Gardsjord, Erlend Strand; Romm, Kristin Lie; Røssberg, Jan Ivar; Friis, Svein; Barder, Helene & Evensen, Julie Horgen [Show all 17 contributors for this article] (2018). Depression and functioning are important to subjective quality of life after a first episode psychosis. Comprehensive Psychiatry. ISSN 0010-440X. 86, p. 107–114. doi: 10.1016/j.comppsych.2018.07.014.
• Moore, Jennifer; Friis, Svein; Graham, Ian D.; Gundersen, Elisabeth & Nordvik, Jan Egil (2018). Reported use of evidence in clinical practice: A survey of rehabilitation practices in Norway. BMC Health Services Research. ISSN 1472-6963. 18(379). doi: 10.1186/s12913-018-3193-8. Full text in Research Archive
• Øvergaard, Kristin Romvig; Ørbeck, Beate; Friis, Svein; Pripp, Are Hugo; Biele, Guido & Aase, Heidi [Show all 7 contributors for this article] (2018). Attention-Deficit/Hyperactivity Disorder in Preschoolers: The Accuracy of a Short Screener. Journal of the American Academy of Child and Adolescent Psychiatry. ISSN 0890-8567. 57(6), p. 428–435. doi: 10.1016/j.jaac.2018.03.008. Full text in Research Archive
• Melle, Ingrid; Johannessen, Jan Olav; Haahr, Ulrik H.; Hegelstad, Wenche; Joa, Inge & Langeveld, Johannes H. [Show all 15 contributors for this article] (2017). Causes and predictors of premature death in first-episode schizophrenia spectrum disorders. World Psychiatry. ISSN 1723-8617. 16(2), p. 217–218. doi: 10.1002/wps.20431.
• Gardsjord, Erlend Strand; Romm, Kristin Lie; Røssberg, Jan Ivar; Friis, Svein; Barder, Helene & Evensen, Julie Horgen [Show all 18 contributors for this article] (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. Schizophrenia Research. ISSN 0920-9964. 193, p. 364–369. doi: 10.1016/j.schres.2017.07.006.
• Langeveld, Johannes H.; Bjørkly, Stål; Evensen, Julie Horgen; Joa, Inge; Johannessen, Jan Olav & Larsen, Tor Ketil [Show all 15 contributors for this article] (2017). A 10-year follow-up study of violent victimization in first episode psychosis : risk and protective factors. Psychiatry Research. ISSN 0165-1781. 259(January), p. 545–549. doi: 10.1016/j.psychres.2017.11.013. Show summary

  Violent victimization in persons with severe mental illness has long-term adverse consequences. Little is known about the long-term prevalence of victimization in first episode psychosis, or about factors affecting victimization throughout the course of illness. To assess the prevalence of violent victimization during a 10-year follow-up period in a group of first episode psychosis (FEP) patients, and to identify early predictors and risk factors for victimization. A prospective design was used with comprehensive assessments of violent victimization, treatment variables and functioning at baseline and during 10-year follow-up. A clinical epidemiological sample of FEP patients (n= 298) was studied. FEP patients in our study were at a 3.5 times greater risk of victimization as compared to the normal population. During the 10-year follow-up period, 23% of subjects fell victim to one or more violent assaults. Victimized patients were younger and reported less occupational activity. At 10-year follow-up, victimization was associated with more concomitant drug use, alcohol misuse and violent behavior, but not with a worse clinical or functional outcome. Treatment programs should focus on risk factors for victimization and develop behavioral alternatives to mitigate risk in FEP patients.

• Weibell, Melissa Anne ; Hegelstad, Wenche; Auestad, Bjørn Henrik; Bramness, Jørgen Gustav; Evensen, Julie Horgen & Haahr, Ulrik [Show all 17 contributors for this article] (2017). The Effect of Substance Use on 10-Year Outcome in First-Episode Psychosis. Schizophrenia Bulletin. ISSN 0586-7614. 43(4), p. 843–851. doi: 10.1093/schbul/sbw179.
• Furre, Astrid; Falk, Ragnhild Sørum; Sandvik, Leiv; Friis, Svein; Knutzen, Maria & Hanssen-Bauer, Ketil (2017). Characteristics of adolescents frequently restrained in acute psychiatric units in Norway: A nationwide study. Child and Adolescent Psychiatry and Mental Health (CAPMH). ISSN 1753-2000. 11(1). doi: 10.1186/s13034-016-0136-1.
• 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
• Bendiksen, Bothild; Svensson, Elisabeth; Aase, Heidi; Reichborn-Kjennerud, Ted; Friis, Svein & Myhre, Anne Margrethe [Show all 7 contributors for this article] (2017). Co-Occurrence of ODD and CD in Preschool Children With Symptoms of ADHD. Journal of Attention Disorders. ISSN 1087-0547. 21(9), p. 741–752. doi: 10.1177/1087054714538655.
• Haahr, Ulrik Helt; Larsen, Tor Ketil; Simonsen, Erik; Rund, Bjørn Rishovd; Joa, Inge & Røssberg, Jan Ivar [Show all 16 contributors for this article] (2016). Relation between premorbid adjustment, duration of untreated psychosis and close interpersonal trauma in first-episode psychosis . Early Intervention in Psychiatry. ISSN 1751-7885. 12(3), p. 316–323. doi: 10.1111/eip.12315.
• Hegelstad, Wenche; Brønnick, Kolbjørn Selvåg; Barder, Helene; Evensen, Julie Horgen; Haahr, Ulrik & Joa, Inge [Show all 17 contributors for this article] (2016). Preventing poor vocational functioning in psychosis through early intervention. Psychiatric Services. ISSN 1075-2730. 68(1), p. 100–103. doi: 10.1176/appi.ps.201500451.
• Kvåle, Alice; Bunkan, Berit Heir; Ilner, Stein E. Opjordsmoen & Friis, Svein (2016). The Global Body Examination (GBE): A useful instrument for examination of patients with long-lasting musculoskeletal and/or psychological disorders. European Journal of Physiotherapy. ISSN 2167-9169. 18(2), p. 137–143. doi: 10.3109/21679169.2016.1149217.
• Gardsjord, Erlend Strand; Romm, Kristin Lie; Friis, Svein; Barder, Helene; Evensen, Julie Horgen & Haahr, Ulrik [Show all 18 contributors for this article] (2016). Subjective quality of life in first-episode psychosis. A ten year follow-up study. Schizophrenia Research. ISSN 0920-9964. 172(1-3), p. 23–28. doi: 10.1016/j.schres.2016.02.034.
• Bjerke, Espen; Solbakken, Ole Andre; Friis, Svein & Monsen, Jon Trygve (2016). Self-Relatedness and Interpersonal Problems in a Large Psychiatric Outpatient Sample. PSYCHOLOGY. ISSN 2152-7180. 7, p. 864–876. doi: 10.4236/psych.2016.76088.
• Furre, Astrid; Sandvik, Leiv; Friis, Svein; Knutzen, Maria & Hanssen-Bauer, Ketil (2016). A nationwide study of why and how acute adolescent psychiatric units use restraint. Psychiatry Research. ISSN 0165-1781. 237, p. 60–66. doi: 10.1016/j.psychres.2016.01.067.
• Friis, Svein; Melle, Ingrid; Johannessen, Jan Olav; Røssberg, Jan Ivar; Barder, Helene & Evensen, Julie Horgen [Show all 16 contributors for this article] (2016). Early Predictors of Ten-Year Course in First-Episode Psychosis. Psychiatric Services. ISSN 1075-2730. 67(4), p. 438–443. doi: 10.1176/appi.ps.201400558.
• Rund, Bjørn Rishovd; Barder, Helene; Evensen, Julie Horgen; Haahr, Ulrik; Hegelstad, Wenche & Joa, Inge [Show all 17 contributors for this article] (2016). Neurocognition and Duration of Psychosis: A 10-year Follow-up of First-Episode Patients. Schizophrenia Bulletin. ISSN 0586-7614. 42(1), p. 87–95. doi: 10.1093/schbul/sbv083.
• Sønmez, Nasrettin; Røssberg, Jan Ivar; Evensen, Julie Horgen; Barder, Helene; Haahr, Ulrik & Hegelstad, Wenche [Show all 17 contributors for this article] (2016). Depressive symptoms in first-episode psychosis: A 10-year follow-up study. Early Intervention in Psychiatry. ISSN 1751-7885. 10(3), p. 227–233. doi: 10.1111/eip.12163.
• Nilsen, Liv; Frich, Jan C; Friis, Svein; Norheim, Irene & Røssberg, Jan Ivar (2016). Participants' perceived benefits of family intervention following a first episode of psychosis: A qualitative study. Early Intervention in Psychiatry. ISSN 1751-7885. 10(2), p. 152–159. doi: 10.1111/eip.12153.
• Bendiksen, Bothild; Aase, Heidi; Diep, Lien My; Svensson, Elisabeth; Friis, Svein & Zeiner, Pål (2015). The Associations Between Pre- and Postnatal Maternal Symptoms of Distress and Preschooler's Symptoms of ADHD, Oppositional Defiant Disorder, Conduct Disorder, and Anxiety. Journal of Attention Disorders. ISSN 1087-0547. doi: 10.1177/1087054715616185. Show summary

  Objective: The objective of this article is to examine the associations between pre- and postnatal maternal distress and preschooler’s symptoms of ADHD, Oppositional Defiant Disorder (ODD), Conduct Disorder (CD), and anxiety, by timing and gender. Method: Children, aged 3.5 years (N = 1,195), recruited from the Norwegian Mother and Child Cohort Study, were assessed with a semistructured parental psychiatric interview. Perinatal maternal symptoms of distress were assessed by Symptom Checklist (SCL-5); Poisson regression was used to examine the associations. Results: Mid-gestational maternal distress significantly increased the average number of child symptoms, ranging between 3.8% for ADHD hyperactive–impulsive (ADHD-HI) and 8.7% for anxiety. The combination of high maternal scores of distress both pre- and postnatally were associated with increased risk of child symptoms of anxiety (relative risk [RR] = 2.10; 95% confidence interval [CI] = [1.43, 3.07]), CD (RR = 1.83; 95% CI = [1.33, 2.51]), and ODD (RR = 1.30; 95% CI = [1.03, 1.64]), with minor sex differences. Conclusion: Maternal distress during mid-gestation was associated with ADHD, behavioral, and emotional symptoms in preschool children. Continued exposure into the postnatal period may further increase these risk associations .

• Nilsen, Liv; Norheim, Irene; Frich, Jan C; Friis, Svein & Røssberg, Jan Ivar (2015). Challenges for group leaders working with families dealing with early psychosis: a qualitative study. BMC Psychiatry. ISSN 1471-244X. 15. doi: 10.1186/s12888-015-0540-8.
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Evensen, Julie Horgen; Haahr, Ulrik & Hegelstad, Wenche [Show all 17 contributors for this article] (2015). Ten year course of IQ in first-episode psychosis: relationship between duration of psychsis and long-term intellectual trajectories. Psychiatry Research. ISSN 0165-1781. 225(3), p. 515–521. doi: 10.1016/j.psychres.2014.11.054.
• Bull, Helen Christine; Ueland, Toril; Lystad, June; Evensen, Stig; Friis, Svein & Martinsen, Egil Wilhelm [Show all 7 contributors for this article] (2014). Validation of the Work Behavior Inventory. Nordic Journal of Psychiatry. ISSN 0803-9488. 69(4), p. 300–306. doi: 10.3109/08039488.2014.973902.
• Furre, Astrid; Sandvik, Leiv; Heyerdahl, Sonja; Friis, Svein; Knutzen, Maria & Hanssen-Bauer, Ketil (2014). Characteristics of adolescents subjected to restraint in acute psychiatric units in Norway: A case-control study. Psychiatric Services. ISSN 1075-2730. 65(11), p. 1367–1372. doi: 10.1176/appi.ps.201300429.
• Bendiksen, Bothild; Aase, Heidi; Svensson, Elisabeth; Friis, Svein; Myhre, Anne Margrethe & Reichborn-Kjennerud, Ted [Show all 7 contributors for this article] (2014). Impairment in young preschool children with symptoms of attention-deficit/hyperactivity disorder and co-occurring oppositional defiant disorder and conduct disorder. Scandinavian Journal of Child and Adolescent Psychiatry and Psychology. ISSN 2245-8875. 2(3), p. 95–105. doi: 10.21307/sjcapp-2014-014. Full text in Research Archive
• Langeveld, Johannes H.; Bjørkly, Stål; Auestad, Bjørn Henrik; Barder, Helene; Evensen, Julie Horgen & Hegelstad, Wenche [Show all 17 contributors for this article] (2014). Treatment and violent behavior in persons with first episode psychosis during a 10-year prospective follow-up study. Schizophrenia Research. ISSN 0920-9964. 156(2-3), p. 272–276. doi: 10.1016/j.schres.2014.04.010. Show summary

  Background: First episode psychosis (FEP) patients have an increased risk for violence and criminal activity prior to initial treatment. However, little is known about the prevalence of criminality and acts of violence many years after implementation of treatment for a first episode psychosis. Aim: To assess the prevalence of criminal and violent behaviors during a 10-year follow-up period after the debut of a first psychosis episode, and to identify early predictors and concomitant risk factors of violent behavior. Method: A prospective design was used with comprehensive assessments of criminal behavior, drug abuse, clinical, social and treatment variables at baseline, five, and 10-year follow-up. Additionally, threatening and violent behavior was assessed at 10-year follow-up. A clinical epidemiological sample of first-episode psychosis patients (n= 178) was studied. Results: During the 10-year follow-up period, 20% of subjects had been apprehended or incarcerated. At 10-year follow-up, 15% of subjects had exposed others to threats or violence during the year before assessment. Illegal drug use at baseline and five-year follow-up, and a longer duration of psychotic symptoms were found to be predictive of violent behavior during the year preceding the 10-year follow-up. Conclusion: After treatment initiation, the overall prevalence of violence in psychotic patients drops gradually to rates close to those of the general population. However, persistent illicit drug abuse is a serious risk factor for violent behavior, even long after the start of treatment. Achieving remission early and reducing substance abuse may contribute to a lower long-term risk for violent behavior in FEP patients.

• Nilsen, Liv; Frich, Jan C; Friis, Svein & Røssberg, Jan Ivar (2014). Patients’ and family members’ experiences of a psychoeducational family intervention after a first episode psychosis: a qualitative study. Issues in Mental Health Nursing. ISSN 0161-2840. 35(1), p. 58–68. doi: 10.3109/01612840.2013.837992.
• Knutzen, Maria; Bjørkly, Stål; Eidhammer, Gunnar; Lorentzen, Steinar; Mjøsund, Nina Helen & Ilner, Stein E. Opjordsmoen [Show all 8 contributors for this article] (2014). Characteristics of patients frequently subjected to pharmacological and mechanical restraint—A register study in three Norwegian acute psychiatric wards. Psychiatry Research. ISSN 0165-1781. 215(1), p. 127–133. doi: 10.1016/j.psychres.2013.10.024.
• Hegelstad, Wenche; Joa, Inge; Barder, Helene; Evensen, Julie Horgen; Haahr, Ulrik & Johannessen, Jan Olav [Show all 16 contributors for this article] (2014). Variation in duration of untreated psychosis in an 18-year perspective. Early Intervention in Psychiatry. ISSN 1751-7885. 8(4), p. 323–331. doi: 10.1111/eip.12057.
• Jónsdóttir, Halldóra; Ilner, Stein E. Opjordsmoen; Birkenæs, Astrid Brate; Simonsen, Carmen Elisabeth; Engh, John & Ringen, Petter Andreas [Show all 10 contributors for this article] (2013). Predictors of medication adherence in patients with schizophrenia and bipolar disorder. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 127(1), p. 23–33. doi: 10.1111/j.1600-0447.2012.01911.x.
• Færden, Ann; Barrett, Elizabeth Ann; Nesvåg, Ragnar; Friis, Svein; Finset, Arnstein & Marder, Stephen R. [Show all 10 contributors for this article] (2013). Apathy, poor verbal memory and male gender predict lower psychosocial functioning one year after the first treatment of psychosis. Psychiatry Research. ISSN 0165-1781. 210(1), p. 55–61. doi: 10.1016/j.psychres.2013.02.007.
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Evensen, Julie Horgen; Haahr, Ulrik & Hegelstad, Wenche [Show all 17 contributors for this article] (2013). Ten year neurocognitive trajectories in first-episode psychosis. Frontiers in Human Neuroscience. ISSN 1662-5161. 7. doi: 10.3389/fnhum.2013.00643. Full text in Research Archive
• Knutzen, Maria; Bjørkly, Stål; Eidhammer, Gunnar; Lorentzen, Steinar; Mjøsund, Nina Helen & Ilner, Stein E. Opjordsmoen [Show all 8 contributors for this article] (2013). Mechanical and pharmacological restraints in acute psychiatric wards - why and how are they used? Psychiatry Research. ISSN 0165-1781. 209(1), p. 91–97. doi: 10.1016/j.psychres.2012.11.017. Show summary

  Restraint use has been reported to be common in acute psychiatry, but empirical research is scarce concerning why and how restraints are used. This study analysed data from patients' first episodes of restraint in three acute psychiatric wards during a 2-year study period. Logistic regression analyses were used to identify predictors for type and duration of restraint. The distribution of restraint categories for the 371 restrained patients was as follows: mechanical restraint, 47.2%; mechanical and pharmacological restraint together, 35.3%; and pharmacological restraint, 17.5%. The most commonly reported reason for restraint was assault (occurred or imminent). It increased the likelihood of resulting in concomitant pharmacological restraint. Female patients had shorter duration of mechanical restraint than men. Age above 49 and female gender increased the likelihood of pharmacological versus mechanical restraint, whereas being restrained due to assault weakened this association. Episodes with mechanical restraint and coinciding pharmacological restraint lasted longer than mechanical restraint used separately, and were less common among patients with a personality disorder. Diagnoses, age and reason for restraint independently increased the likelihood for being subjected to specific types of restraint. Female gender predicted type of restraint and duration of episodes.

• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Evensen, Julie Horgen; Haahr, Ulrik & Hegelstad, Wenche [Show all 17 contributors for this article] (2013). Neurocognitive development in first episode psychosis 5 years follow-up: associations between illness severity and cognitive course. Schizophrenia Research. ISSN 0920-9964. 149(1-3), p. 63–69. doi: 10.1016/j.schres.2013.06.016. Show summary

  Cognitive deficits are documented in first-episode psychosis (FEP), but the continuing course is not fully understood. The present study examines the longitudinal development of neurocognitive function in a five year follow-up of FEP-patients, focusing on the relation to illness severity, as measured by relapses and diagnostic subgroups. The study is an extension of previous findings from the TIPS-project, reporting stability over the first two years. Sixty-two FEP patients (53% male, age 28 ± 9 years) were neuropsychologically examined at baseline and at 1, 2, and 5 year follow-ups. The test battery was divided into five indices; Verbal Learning, Executive Function, Impulsivity, Motor Speed, and Working Memory. To investigate the effect of illness severity, the sample was divided in groups based on number of relapses, and diagnostic subgroups, respectively. Impulsivity and Working Memory improved significantly in the first two years, followed by no change over the next three years. Motor Speed decreased significantly from 2 to 5 years. Number of relapses was significantly related to Verbal Learning and Working Memory, showing a small decrease and less improvement, respectively, in patients with two or more episodes. No significant association was found with diagnostic group. Neurocognitive stability as well as change was found in a sample of FEP-patients examined repeatedly over 5 years. Of potential greater importance for understanding how psychotic illnesses progress, is the finding of significant associations between neurocognition and number of relapses but not diagnostic group, indicating that neurocognition is more related to recurring psychotic episodes than to the descriptive diagnosis per se.

• Kvåle, Alice; Bunkan, Berit Heir; Ilner, Stein E. Opjordsmoen & Friis, Svein (2013). Development of the Palpation Domain for Muscle and Skin in the Global Body Examination. Journal of Musculoskeletal Pain. ISSN 1058-2452. 21(1), p. 9–18. doi: 10.3109/10582452.2012.762821. Full text in Research Archive
• Hegelstad, Wenche; Haahr, Ulrik; Larsen, Tor Ketil; Auestad, Bjørn Henrik; Barder, Helene & Evensen, Julie Horgen [Show all 17 contributors for this article] (2013). Early detection, early symptom progression and symptomatic remission after ten years in a first episode of psychosis study. Schizophrenia Research. ISSN 0920-9964. 143(2-3), p. 337–343. doi: 10.1016/j.schres.2012.10.027.
• Bakken, Trine Lise; Røssberg, Jan Ivar & Friis, Svein (2012). The used of the Ward Atmosphere Scale for intellectually disabled psychiatric inpatients: A pilot study. Advances in Mental Health and Intellectual Disabilities. ISSN 2044-1282. p. 265–272. doi: 10.1108/20441281211261159.
• Haahr, Ulrik; Simonsen, Erik; Røssberg, Jan Ivar; Johannessen, Jan Olav; Larsen, Tor Ketil & Melle, Ingrid [Show all 11 contributors for this article] (2012). Patient satisfaction with treatment in first-episode psychosis. Nordic Journal of Psychiatry. ISSN 0803-9488. 66(5), p. 329–335. doi: 10.3109/08039488.2011.644808.
• Bakken, TL; Røssberg, Jan Ivar & Friis, Svein (2012). The use of the Ward Atmosphere Scale for intellectually disabled psychiatry inpatients: A pilot study. Advances in Mental Health and Intellectual Disabilities. ISSN 2044-1282. p. 265–272.
• Friis, Svein; Kvåle, Alice; Ilner, Stein E. Opjordsmoen & Bunkan, Berit Heir (2012). The Global Body Examination (GBE). A useful instrument for evaluation of respiration. Advances in Physiotherapy. ISSN 1403-8196. 14(4), p. 146–154. doi: 10.3109/14038196.2012.704943. Show summary

  Background and aims: Assessment of respiration is important in medicine and physical therapy. As respiration is multifaceted, we need several specific examination methods. The purpose of this study was to develop a method for examination of visible respiratory movements, by extracting from two examinations the items with best ability to discriminate among healthy controls, patients with pain disorders and patients with psychotic disorders. Methods: Two physiotherapists independently examined 132 individuals (34 healthy persons, 32 with localized pain, 32 with widespread pain and 34 with psychoses). Items were assigned to subscales by explorative factor analysis. Internal consistency of subscales was examined with Cronbach's alpha. To examine validity, one-way analysis of variance and the area under the curve (AUC) were used. Results: We identified four subscales: Tension, Position of Thorax, Basal respiration and Thoracic movements. Cronbach's alpha ranged from 0.75 to 0.86. The subscales’ discriminating ability was excellent between healthy controls and patients, and fair between patients with localized pain and the two other patient groups. Conclusions: The respiration domain of the new Global Body Examination has 21 items, which comprise four subscales with high internal consistency and good ability to discriminate between healthy persons and patients with pain disorders or psychosis.

• Langeveld, Johannes H.; Joa, Inge; Friis, Svein; Hegelstad, Wenche; Melle, Ingrid & Johannessen, Jan Olav [Show all 12 contributors for this article] (2012). A Comparison of Adolescent and Adult Onset First-Episode Non Affective Psychosis: 2-year Follow-up:. European Archives of Psychiatry and Clinical Neuroscience. ISSN 0940-1334. 262, p. 599–605. doi: 10.1007/s00406-012-0308-9..
• Friis, Svein (2012). Kan man bli frisk av schizofreni. Tidsskrift for Den norske legeforening. ISSN 0029-2001. p. 847–848. doi: 10.4045/tidsskr.12.0270.
• Evensen, Julie Horgen; Røssberg, Jan Ivar; Barder, Helene; Haahr, Ulrik; Hegelstad, Wenche & Joa, Inge [Show all 15 contributors for this article] (2012). Flat affect and social functioning: A 10 year follow-up study of first episode psychosis patients. Schizophrenia Research. ISSN 0920-9964. 139(1-3), p. 99–104. doi: 10.1016/j.schres.2012.04.019.
• Evensen, Julie Horgen; Røssberg, Jan Ivar; Barder, Helene; Haahr, Ulrik; Hegelstad, Wenche & Joa, Inge [Show all 16 contributors for this article] (2012). Apathy in first episode psychosis patients: A ten year longitudinal follow-up study. Schizophrenia Research. ISSN 0920-9964. 136(1-3), p. 19–24. doi: 10.1016/j.schres.2011.12.019.
• Hegelstad, Wenche; Larsen, Tor Kjetil; Auestad, Bjørn Henrik; Evensen, Julie Horgen; Haahr, Ulrik & Joa, Inge [Show all 17 contributors for this article] (2012). Long-Term Follow-Up of the TIPS Early Detection in Psychosis Study: Effects on 10-Year Outcome. American Journal of Psychiatry. ISSN 0002-953X. 169(4), p. 374–380. doi: 10.1176/appi.ajp.2011.11030459.
• Kvåle, Alice; Bunkan, Berit Heir; Ilner, Stein E. Opjordsmoen & Friis, Svein (2012). Development of the Movement domain in the Global Body Examination. Physiotherapy Theory and Practice. ISSN 0959-3985. 28(1), p. 41–49. doi: 10.3109/09593985.2011.561419.
• Nesvold, Helle; Ormstad, Kari & Friis, Svein (2011). Sexual assault centres and police reporting - an important arena for medical/legal interaction. Journal of Forensic Sciences. ISSN 0022-1198. 56(5), p. 1163–1169. doi: 10.1111/j.1556-4029.2011.01880.x.
• Knutzen, Maria; Mjøsund, Nina Helen; Eidhammer, Gunnar; Lorentzen, Steinar; Ilner, Stein E. Opjordsmoen & Sandvik, Leiv [Show all 7 contributors for this article] (2011). Characteristics of Psychiatric Inpatients Who Experienced Restraint and Those Who Did Not: A Case-Control Study. Psychiatric Services. ISSN 1075-2730. 62(5), p. 492–497. doi: 10.1176/ps.62.5.pss6205_0492.
• Nesvold, Helle; Ormstad, Kari & Friis, Svein (2011). To be Used or Not to be Used, that is the Question: Legal Use of Forensic and Clinical Information Collected in a Self-referral Sexual Assault Centre. Journal of Forensic Sciences. ISSN 0022-1198. 56(5), p. 1156–1162. doi: 10.1111/j.1556-4029.2011.01879.x.
• Johannessen, Jan Olav; Joa, Inge; Auestad, Bjørn; Haahr, Ulrik; Larsen, Tor Ketil & Melle, Ingrid [Show all 13 contributors for this article] (2011). First-episode psychosis patients recruited into treatment via early detection teams versus ordinary pathways: course and health service use during 5 years. Early Intervention in Psychiatry. ISSN 1751-7885. 5(1), p. 70–75. doi: 10.1111/j.1751-7893.2010.00201.x.
• Tandberg, Marte; Ueland, Toril; Sundet, Kjetil Søren; Haahr, Ulrik; Joa, Inge & Johannessen, Jan Olav [Show all 15 contributors for this article] (2011). Neurocognition and occupational functioning in patients with first-episode psychosis: a 2-year follow-up study. Psychiatry Research. ISSN 0165-1781. 188(3), p. 334–342. doi: 10.1016/j.psychres.2011.04.021.
• Engh, John; Sundet, Kjetil Søren; Simonsen, Carmen Elisabeth; Vaskinn, Anja; Lagerberg, Trine Vik & Ilner, Stein E. Opjordsmoen [Show all 8 contributors for this article] (2011). Verbal learning contributes to cognitive insight in schizophrenia independently of affective and psychotic symptoms. Progress in Neuro-psychopharmacology and Biological Psychiatry. ISSN 0278-5846. 35(4), p. 1059–1063. doi: 10.1016/j.pnpbp.2011.02.021.
• Larsen, Tor Ketil; Melle, Ingrid; Auestad, Bjørn H.; Haahr, Ulrik; Joa, Inge & Johannessen, Jan Olav [Show all 13 contributors for this article] (2011). Early detection of psychosis: positive effects on 5-year outcome. Psychological Medicine. ISSN 0033-2917. 41(7), p. 1461–1469. doi: 10.1017/S0033291710002023.
• Evensen, Julie Horgen; Røssberg, Jan Ivar; Haahr, Ulrik; Hegelstad, Wenche; Joa, Inge & Johannessen, Jan Olav [Show all 16 contributors for this article] (2011). Contrasting monosymptomatic patients with hallucinations and delusions in first-episode psychosis patients: a five-year longitudinal follow-up study. Psychopathology. ISSN 0254-4962. 44(2), p. 90–97. doi: 10.1159/000319789.
• Simonsen, Carmen Elisabeth; Sundet, Kjetil Søren; Vaskinn, Anja; Birkenæs, Astrid Brate; Engh, John & Færden, Ann [Show all 12 contributors for this article] (2011). Neurocognitive dysfunction in bipolar and schizophrenia spectrum disorders depends on history of psychosis rather than diagnostic group. Schizophrenia Bulletin. ISSN 0586-7614. 37(1), p. 73–83. doi: 10.1093/schbul/sbp034.
• Johannessen, Jan Olav; Joa, Inge; Auestad, Bjørn H.; Haahr, Ulrik; Larsen, Tor Ketil & Melle, Ingrid [Show all 13 contributors for this article] (2010). First-episode psychosis patients recruited into treatment via early detection teams versus ordinary pathways: course and health service use during 5 years. Early Intervention in Psychiatry. ISSN 1751-7885. doi: 10.1111/j.1751-7893.2010.00201.x.

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• Hem, Erlend; Kirkevold, Marit; Friis, Svein & Vaglum, Per Jørgen Wiggen (2021). Innføring i klinisk forskning og fagutvikling. Universitetsforlaget. ISBN 978-82-15-05659-3. 218 p.

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• Friis, Svein; Melle, Ingrid & McGlashan, Thomas H. (2019). Symptom remission at 12-weeks is a strong predictor for long term outcome. Psychological Medicine. ISSN 0033-2917. 50(14). doi: 10.1017/S0033291719003465.
• Øvergaard, Kristin Romvig; Ørbeck, Beate; Friis, Svein; Biele, Guido; Aase, Heidi & Zeiner, Pål (2018). Inattention in pre-School ADHD- are there gender differences?
• Øvergaard, Kristin Romvig; Ørbeck, Beate; Friis, Svein; Pripp, Are Hugo; Biele, Guido & Aase, Heidi [Show all 7 contributors for this article] (2018). Dr Øvergaard et al. Reply. Journal of the American Academy of Child and Adolescent Psychiatry. ISSN 0890-8567. 57(9), p. 701–702. doi: 10.1016/j.jaac.2018.05.021.
• Guloksuz, Sinan; Li, Fangyong; Tek, Cenk; Woods, Scott W.; McGlashan, T.H. & Friis, Svein [Show all 7 contributors for this article] (2016). Analyzing the duration of untreated psychosis: Quantile regression. JAMA psychiatry. ISSN 2168-6238. 73(10), p. 1094–1095. doi: 10.1001/jamapsychiatry.2016.2013.
• Dahl, Hanne-Sofie Johnsen ; Ulberg, Randi; Friis, Svein; Perry, John Christopher & Høglend, Per Andreas (2016). Therapists' inadequate feelings and long-term effect of transference work. Psychotherapy and Psychosomatics. ISSN 0033-3190. 85(5), p. 309–310. doi: 10.1159/000444647.
• Kvåle, Alice; Bunkan, Berit Heir; Opjordsmoen, Stein & Friis, Svein (2015). The Global Body Examination (GBE) - a useful instrument for examination of patients with long-lasting musculoskeletal and/or psychological disorders.
• Friis, Svein (2015). How to help clinically relevant research survive? Acta Psychiatrica Scandinavica. ISSN 0001-690X. 132(6), p. 439–440. doi: 10.1111/acps.12515.
• Friis, Svein (2015). Skjerming – straff eller støtte? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 135(1), p. 8–8. doi: 10.4045/tidsskr.14.1271.
• Norheim, Irene; Nilsen, Liv; Frich, Jan C; Friis, Svein & Røssberg, Jan Ivar (2014). Psychosocial intervention - Challenges With Family work in early psychosis: a qualitative study of Professionals' experiences. .
• Nilsen, L; Frich, Jan C; Friis, Svein; Norheim, Irene & Røssberg, Jan Ivar (2014). Psychosocial intervention. Patients and Family members perceived benefits from psychoeducational Family work in first-episode psychosis.
• Knutzen, Maria; Bjørkly, Stål; Eidhammer, Gunnar; Lorentzen, Steinar; Mjøsund, Nina Helen & Opjordsmoen, Stein [Show all 8 contributors for this article] (2014). Corrigendum to "Characteristics of patients frequently subjected to pharmacological and mechanical restraint - A register study in three Norwegian acute psychiatric wards" [Psychiatry Res. 215 (2014) 127-133]. Psychiatry Research. ISSN 0165-1781. 219(3). doi: 10.1016/j.psychres.2014.03.013.
• Friis, Svein (2014). Prediction of outcome in schizophrenia depends on the sample. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 130(4), p. 241–242. doi: 10.1111/acps.12288.
• Nilsen, Liv; Frich, Jan C; Friis, Svein; Norheim, Irene & Røssberg, Jan Ivar (2014). C91 Psychosocial intervention patients and family members perceived benefits from psychoeducational family work in first-episode psychosis. Early Intervention in Psychiatry. ISSN 1751-7885. 8, p. 156–156.
• Norheim, Irene; Nilsen, Liv; Frich, Jan C; Friis, Svein & Røssberg, Jan Ivar (2014). B90 Psychosocial intervention – challenges with family work in early psychosis: a qualitative study of professionals ’ experiences. Early Intervention in Psychiatry. ISSN 1751-7885. 8, p. 121–121.
• Hegelstad, Wenche; Larsen, Tor Ketil; Evensen, Julie Horgen; Friis, Svein; Haahr, Ulrick & Joa, Inge [Show all 12 contributors for this article] (2012). Long-term follow-up of the TIPS early detection in psychosis study: effects on 10-year outcome. Early Intervention in Psychiatry. ISSN 1751-7885. 6, p. 15–15.
• Melle, Ingrid; Johannessen, Jan Olav; Joa, Inge; Haahr, Ulrik; Rossberg, Jan Ivar & Evensen, Julie [Show all 12 contributors for this article] (2012). Suicide and accidental death in first-episode schizophrenia spectrum psychosis. Early Intervention in Psychiatry. ISSN 1751-7885. 6(Supp. 1), p. 23–23.
• Melle, Ingrid; Joa, Inge; Larsen, T.K.; Haahr, Ulrik; Friis, Svein & Johannesen, Jan O. [Show all 10 contributors for this article] (2012). Shortening the duration of untreated psychosis: experiences from the TIPS study. Early Intervention in Psychiatry. ISSN 1751-7885. 6, p. 5–5.
• Langeveld, Johannes H.; Joa, Inge; Johannessen, Jan Olav; Friis, Svein; Hegelstad, Wenche & Melle, Ingrid [Show all 12 contributors for this article] (2012). Characteristic of first-episode psychosis patients reporting violent/threatening behavior. Early Intervention in Psychiatry. ISSN 1751-7885. 6, p. 51–51.
• Haahr, Ulrik; Larsen, Tor Ketil; Simonsen, Erik; Joa, Inge; Melle, Ingrid & Rossberg, Jan Ivar [Show all 12 contributors for this article] (2012). The relation between trauma and clinical factors in first-episode psychosis: Results from the TIPS study. Early Intervention in Psychiatry. ISSN 1751-7885. 6, p. 82–82.
• Friis, Svein; Barder, Helene; Evensen, Julie Horgen; Haahr, Ulrik; Hegelstad, Wenche ten Velden & Joa, Inge [Show all 17 contributors for this article] (2012). The TIPS study and bias: Replies to Dr Amos. Australian and New Zealand journal of psychiatry (Print). ISSN 0004-8674. 46(9), p. 905–907. doi: 10.1177/0004867412451344.
• Barder, Helene; Sundet, Kjetil Søren; Rund, Bjørn Rishovd; Haar, Ulrik; Johannessen, Jan Olav & Larsen, Tor Ketil [Show all 12 contributors for this article] (2012). Neurocognitive development in first-episode psychosis 5-year follow-up: associations between illness severity and cognitive course. Early Intervention in Psychiatry. ISSN 1751-7885. 6, p. 27–27.
• Tandberg, Marte; Ueland, Toril; Sundet, Kjetil Søren; Melle, Ingrid; Røssberg, Jan Ivar & Joa, Inge [Show all 15 contributors for this article] (2011). NEUROCOGNITION AND OCCUPATIONAL FUNCTIONING IN PATIENTS WITH FIRST EPISODE PSYCHOSIS: A 2-YEAR FOLLOW-UP STUDY. Schizophrenia Bulletin. ISSN 0586-7614. 37, p. 254–254.
• Friis, Svein; Evensen, Julie Horgen; Haahr, Ulrik; Hegelstad, Wenche; Joa, Inge & Johannessen, O [Show all 16 contributors for this article] (2011). Early Detection and Intervention(EDI) in first episode psychosis: Can it reduce the risk for poor outcome? Tips 10 years findings. Schizophrenia Bulletin. ISSN 0586-7614. 37, p. 98–98.
• McGlashan, Thomas H.; Evensen, Julie Horgen; Haahr, J.; Hegelstad, Wenche; Joa, Inge & Johannessen, Jan Olav [Show all 16 contributors for this article] (2011). EARLY DETECTION AND INTERVENTION (EDI) IN FIRST EPISODE PSYCHOSIS: CAN IT IN CREASE THE CHANCE FOR FULL RECOVERY? TIPS 10 YEAR FINDINGS. Schizophrenia Bulletin. ISSN 0586-7614. 37, p. 273–274.
• Melle, Ingrid; Evensen, Julie Horgen; Haahr, U.; Hegelstad, Wenche; Joa, Inge & Johannessen, Jan Olav [Show all 16 contributors for this article] (2011). Quality of life and recovery in psychotic disorders - 10 year follow-up of the tips study. Schizophrenia Bulletin. ISSN 0586-7614. 37, p. 274–274.
• Engh, John & Friis, Svein (2011). Cognitive insight and clinical insight in schizophrenia : methodological, neurocognitive and psychopathological aspects and comparison to bipolar disorder. Unipub forlag. ISSN 978-82-8072-529-5.

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