Petter Andreas Ringen

• Bell, Christina; Rokicki, Jaroslav; Tesli, Natalia; Gurholt, Tiril Pedersen; Hjell, Gabriela & Fischer-Vieler, Thomas [Show all 15 contributors for this article] (2024). Hypothalamic subunit volumes and relations to violence and psychopathy in male offenders with or without a psychotic disorder. European Archives of Psychiatry and Clinical Neuroscience. ISSN 0940-1334. doi: 10.1007/s00406-023-01725-4.
• Langjord, Tuva; Pedersen, Geir Arild Feigum; Bovim, Tone Helene; Christensen, Tore Buer; Eikenæs, Ingeborg Helene Ulltveit-Moe & Hove, Oddbjørn [Show all 21 contributors for this article] (2023). Mental health disorders, functioning and health-related quality of life among extensively hospitalized patients due to severe self-harm – results from the Extreme Challenges project. Frontiers in Psychiatry. ISSN 1664-0640. 14. doi: 10.3389/fpsyt.2023.1258025. Full text in Research Archive
• Argote, Mathilde; Sescousse, Guillaume; Brunelin, Jérôme; Baudin, Grégoire; Schaub, Michael Patrick & Rabin, Rachel [Show all 37 contributors for this article] (2023). Association between cannabis use and symptom dimensions in schizophrenia spectrum disorders: an individual participant data meta-analysis on 3053 individuals. EClinicalMedicine. ISSN 2589-5370. 64. doi: 10.1016/j.eclinm.2023.102199. Full text in Research Archive
• Lunding, Synve Hoffart; Ueland, Torill; Aas, Monica; Høegh, Margrethe Collier; Werner, Maren Caroline Frogner & Rødevand, Linn [Show all 16 contributors for this article] (2023). Tobacco smoking related to childhood trauma mediated by cognitive control and impulsiveness in severe mental disorders. Schizophrenia Research. ISSN 0920-9964. 261, p. 236–244. doi: 10.1016/j.schres.2023.09.041. Full text in Research Archive
• Fischer-Vieler, Thomas; Ringen, Petter Andreas; Kvig, Erling Inge; Bell, Christina; Hjell, Gabriela & Tesli, Natalia [Show all 11 contributors for this article] (2023). Associations Between Clinical Insight and History of Severe Violence in Patients With Psychosis. Schizophrenia Bulletin Open. ISSN 2632-7899. 4(1). doi: 10.1093/schizbullopen/sgad011. Full text in Research Archive
• Bell, Christina; Tesli, Natalia; Gurholt, Tiril Pedersen; Rokicki, Jaroslav; Hjell, Gabriela & Fischer-Vieler, Thomas [Show all 14 contributors for this article] (2022). Psychopathy subdomains in violent offenders with and without a psychotic disorder. Nordic Journal of Psychiatry. ISSN 0803-9488. doi: 10.1080/08039488.2022.2128869. Full text in Research Archive
• Goldfarb, Michael; De Hert, Marc; Detraux, Johan; Di Palo, Katherine; Munir, Haroon & Music, Sanela [Show all 8 contributors for this article] (2022). Severe Mental Illness and Cardiovascular Disease: JACC State-of-the-Art Review. Journal of the American College of Cardiology. ISSN 0735-1097. 80(9), p. 918–933. doi: 10.1016/j.jacc.2022.06.017.
• Kan, Zhanna; Søegaard, Erik Ganesh Iyer; Siqveland, Johan; Hussain, Ajmal; Hanssen-Bauer, Ketil & Jensen, Pia [Show all 12 contributors for this article] (2022). Coping, Social Support and Loneliness during the COVID-19 Pandemic and Their Effect on Depression and Anxiety: Patients’ Experiences in Community Mental Health Centers in Norway. Healthcare. ISSN 2227-9032. 10(5). doi: 10.3390/healthcare10050875. Full text in Research Archive Show summary

  Background: Little is known about psychiatric patients’ experiences during the COVID-19 pandemic. The purpose of this study was to investigate associations of coping strategies, social support and loneliness with mental health symptoms among these patients. Methods: We recruited 164 patients from Community Mental Health Centers in June–July 2020. Participants responded to an online questionnaire on corona-related questions, Brief Coping Orientation to Problems Experience, Crisis Support Scale, a 3-item Loneliness Scale, and Hopkins Symptom Checklist-25. We used linear regression models to investigate associations between these and symptoms of depression and anxiety. Results: Almost 51% were aged 31–50 years and 77% were females. Forty-six (28%) participants reported worsened overall mental health due to the pandemic. The reported rates of clinical depression and anxiety were 84% and 76%, respectively. Maladaptive coping was independently associated with both depression and anxiety symptoms. Loneliness was independently associated with depression symptoms. Conclusions: Patients in Community Mental Health Centers in Norway reported high rates of depression and anxiety symptoms. Many of them reported worsening of their mental health due to the pandemic, even at a time when COVID-19 infections and restrictive measures were relatively low. Maladaptive coping strategies and loneliness may be possible explanations for more distress. Keywords: anxiety; depression; COVID-19; coping; Community Mental Health Centers; loneliness; social support

• Ringen, Petter Andreas; Lund-Stenvold, Elisabeth Haug; Andreassen, Ole; Gaarden, Torfinn Lødøen; Hartberg, Cecilie Bhandari & Johnsen, Erik [Show all 14 contributors for this article] (2022). Quality of clinical management of cardiometabolic risk factors in patients with severe mental illness in a specialist mental health care setting. Nordic Journal of Psychiatry. ISSN 0803-9488. 76(8), p. 602–609. doi: 10.1080/08039488.2022.2039288. Full text in Research Archive Show summary

  Purpose: Cardiometabolic disease in patients with severe mental illness is a major cause of shortened life expectancy. There is sparse evidence of real-world clinical risk prevention practice. We investigated levels of assessments of cardiometabolic risk factors and risk management interventions in patients with severe mental illness in the Norwegian mental health service according to an acknowledged international standard. Methods: We collected data from 264 patients residing in six country-wide health trusts for: (a) assessments of cardiometabolic risk and (b) assessments of levels of risk reducing interventions. Logistic regressions were employed to investigate associations between risk and interventions. Results: Complete assessments of all cardiometabolic risk variables were performed in 50% of the participants and 88% thereof had risk levels requiring intervention according to the standard. Smoking cessation advice was provided to 45% of daily smokers and 4% were referred to an intervention program. Obesity was identified in 62% and was associated with lifestyle interventions. Reassessment of psychotropic medication was done in 28% of the obese patients. Women with obesity were less likely to receive dietary advice, and use of clozapine or olanzapine reduced the chances for patients with obesity of getting weight reducing interventions. Conclusions: Nearly nine out of the ten participants were identified as being at cardiometabolic high risk and only half of the participants were adequately screened. Women with obesity and patients using antipsychotics with higher levels of cardiometabolic side effects had fewer adequate interventions. The findings underscore the need for standardized recommendations for identification and provision of cardiometabolic risk reducing interventions in all patients with severe mental illness.

• Gjerdalen, Oda Skancke; Lystad, June Ullevoldsæter; Bull, Helen; Ringen, Petter Andreas; Røssberg, Jan Ivar & Martinsen, Egil Wilhelm [Show all 9 contributors for this article] (2022). Vocational rehabilitation augmented with cognitive behavioral therapy or cognitive remediation for individuals with schizophrenia: a 5-year follow-up study. Nordic Journal of Psychiatry. ISSN 0803-9488. 77(1), p. 23–30. doi: 10.1080/08039488.2022.2042598. Full text in Research Archive
• Lunding, Synve Hoffart; Simonsen, Carmen Elisabeth; Aas, Monica; Rødevand, Linn ; Werner, Maren Caroline Frogner & Laskemoen, Jannicke Fjæra [Show all 13 contributors for this article] (2021). Childhood trauma and cardiometabolic risk in severe mental disorders: The mediating role of cognitive control. European psychiatry. ISSN 0924-9338. 64(1). doi: 10.1192/j.eurpsy.2021.14. Full text in Research Archive
• Høilund, Hanne; Galea, David & Ringen, Petter Andreas (2019). Improving quality of antipsychotic polypharmacy: a pilot study. Nordic Journal of Psychiatry. ISSN 0803-9488. doi: 10.1080/08039488.2019.1690044.
• Ringen, Petter Andreas; Reponen, Elina Johanna; Vedal, Trude Seselie Jahr; Andreassen, Ole Andreas; Steen, Nils Eiel & Melle, Ingrid (2019). Predictors for antipsychotic dosage change in the first year of treatment in schizophrenia spectrum and bipolar disorders. Frontiers in Psychiatry. ISSN 1664-0640. 10:649, p. 1–8. doi: 10.3389/fpsyt.2019.00649. Full text in Research Archive
• Icick, Romain; Melle, Ingrid; Étain, Bruno; Ringen, Petter Andreas; Aminoff, Sofie Ragnhild & Leboyer, Marion. [Show all 12 contributors for this article] (2019). Tobacco smoking and other substance use disorders associated with recurrent suicide attempts in bipolar disorder. Journal of Affective Disorders. ISSN 0165-0327. 256, p. 348–357. doi: 10.1016/j.jad.2019.05.075.
• Storvestre, Guttorm Breivik; Valnes, Lars Magnus; Jensen, Arvid; Nerland, Stener; Tesli, Natalia & Hymer, Knut-Erik [Show all 14 contributors for this article] (2019). A preliminary study of cortical morphology in schizophrenia patients with a history of violence. Psychiatry Research : Neuroimaging. ISSN 0925-4927. 288, p. 29–36. doi: 10.1016/j.pscychresns.2019.04.013. Full text in Research Archive
• Ringen, Petter Andreas (2018). Psykiatrien – hvor står du, hvor går du? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 138(3), p. 1–8. doi: 10.4045/tidsskr.17.0936.
• Holth, Fredrik; Walby, Fredrik A; Røstbakken, Thea; Lunde, Ingeborg; Ringen, Petter Andreas & Ramleth, Ruth-Kari [Show all 11 contributors for this article] (2018). Extreme challenges: psychiatric inpatients with severe self-harming behavior in Norway: a national screening investigation. Nordic Journal of Psychiatry. ISSN 0803-9488. 72(8), p. 605–612. doi: 10.1080/08039488.2018.1511751.
• Ringen, Petter Andreas; Falk, Ragnhild Sørum; Antonsen, Bjørnar Torske; Færden, Ann; Mamen, Asgeir & Rognli, Eline Borger [Show all 9 contributors for this article] (2018). Using motivational techniques to reduce cardiometabolic risk factors in long term psychiatric inpatients: A naturalistic interventional study. BMC Psychiatry. ISSN 1471-244X. 18. doi: 10.1186/s12888-018-1832-6. Full text in Research Archive
• Færden, Ann; Lyngstad, Siv Hege; Simonsen, Carmen Elisabeth; Ringen, Petter Andreas; Papsuev, Oleg & Dieset, Ingrid [Show all 10 contributors for this article] (2018). Reliability and validity of the self-report version of the apathy evaluation scale in first-episode Psychosis: Concordance with the clinical version at baseline and 12 months follow-up. Psychiatry Research. ISSN 0165-1781. 267, p. 140–147. doi: 10.1016/j.psychres.2018.05.065. Full text in Research Archive
• Ringen, Petter Andreas; Færden, Ann; Antonsen, Bjørnar Torske; Falk, Ragnhild Sørum; Mamen, Asgeir & Rognli, Eline Borger [Show all 9 contributors for this article] (2018). Cardiometabolic risk factors, physical activity and psychiatric status in patients in long-term psychiatric inpatient departments. Nordic Journal of Psychiatry. ISSN 0803-9488. 72(4), p. 296–302. doi: 10.1080/08039488.2018.1449012. Full text in Research Archive
• Aas, Monica; Melle, Ingrid; Bettella, Francesco; Djurovic, Srdjan; Le Hellard, Stephanie & Bjella, Thomas [Show all 12 contributors for this article] (2017). Psychotic patients who used cannabis frequently before illness onset have higher genetic predisposition to schizophrenia than those who did not. Psychological Medicine. ISSN 0033-2917. 48(1), p. 43–49. doi: 10.1017/S0033291717001209. Full text in Research Archive
• Kvitland, Levi Røstad; Ringen, Petter Andreas; Aminoff, Sofie Ragnhild; Demmo, Christine; Hellvin, Tone & Lagerberg, Trine Vik [Show all 8 contributors for this article] (2016). Duration of untreated illness in first-treatment bipolar I disorder in relation to clinical outcome and cannabis use. Psychiatry Research. ISSN 0165-1781. 246, p. 762–768. doi: 10.1016/j.psychres.2016.07.064.
• Ringen, Petter Andreas; Nesvåg, Ragnar; Helle, Siri; Lagerberg, Trine Vik; Lange, Elisabeth & Løberg, Else-Marie [Show all 9 contributors for this article] (2016). Premorbid cannabis use is associated with more symptoms and poorer functioning in schizophrenia spectrum disorder. Psychological Medicine. ISSN 0033-2917. 46(15), p. 3127–3136. doi: 10.1017/S0033291716001999. Show summary

  Cannabis use disorder is associated with an earlier age at onset and a more severe outcome of schizophrenia spectrum disorders. The role of cannabis use before the onset of illness (premorbid cannabis use) has not been fully investigated. We here examined how amount and type of premorbid cannabis use was associated with the later course of illness including current substance use, symptoms and level of functioning in schizophrenia spectrum disorder. We used a naturalistic sample of patients with DSM-IV schizophrenia spectrum disorders with a comprehensive history of illness and substance use. Data on premorbid substance use was obtained from comprehensive self-report. The relationship to outcome was investigated using regression models that included current substance use and premorbid functioning. Pre-schizophrenia cannabis use was significantly associated with more severe psychotic symptoms and impaired functioning. Higher levels of premorbid cannabis use were associated with higher levels of current psychotic symptoms. These associations were independent of current substance use and premorbid functioning. Early use of cannabis (age <17 years) was associated with earlier age at onset of psychosis, independently of potential confounders. Pre-psychosis cannabis use affects illness outcome in schizophrenia spectrum disorders, and is associated with lower age at onset of psychosis. These findings of independent negative effects of premorbid cannabis use in schizophrenia suggest that a limitation of the general use of cannabis may have beneficial health effects.

• Lagerberg, Trine Vik; Icick, R.; Andreassen, Ole Andreas; Ringen, Petter Andreas; Etain, B & Aas, Monica [Show all 10 contributors for this article] (2016). Cannabis use disorder is associated with greater illness severity in tobacco smoking patients with bipolar disorder. Journal of Affective Disorders. ISSN 0165-0327. 190, p. 286–293. doi: 10.1016/j.jad.2015.10.023.
• Helle, Siri; Ringen, Petter Andreas; Melle, Ingrid; Larsen, Tor Ketil; Gjestad, Rolf & Johnsen, Erik [Show all 12 contributors for this article] (2016). Cannabis use is associated with 3 years earlier onset of schizophrenia spectrum disorder in a naturalistic, multi-site sample (N = 1119). Schizophrenia Research. ISSN 0920-9964. 170(1), p. 217–221. doi: 10.1016/j.schres.2015.11.027.
• Kvitland, Levi Røstad; Melle, Ingrid; Aminoff, Sofie Ragnhild; Lagerberg, Trine Vik; Andreassen, Ole Andreas & Ringen, Petter Andreas (2016). Cannabis use in first-treatment bipolar I disorder: Relations to clinical characteristics. Early Intervention in Psychiatry. ISSN 1751-7885. 10(1), p. 36–44. doi: 10.1111/eip.12138.
• Kvitland, Levi Røstad; Melle, Ingrid; Aminoff, Sofie Ragnhild; Demmo, Christine; Lagerberg, Trine Vik & Andreassen, Ole Andreas [Show all 7 contributors for this article] (2015). Continued cannabis use at one year follow up is associated with elevated mood and lower global functioning in bipolar I disorder. BMC Psychiatry. ISSN 1471-244X. 15(1). doi: 10.1186/s12888-015-0389-x.
• Ringen, Petter Andreas; Engh, John; Birkenæs, Astrid B.; Dieset, Ingrid & Andreassen, Ole A. (2014). Increased mortality in schizophrenia due to cardiovascular disease - a non-systematic review of epidemiology, possible causes and interventions. Frontiers in Psychiatry. ISSN 1664-0640. 5. doi: 10.3389/fpsyt.2014.00137. Full text in Research Archive
• Aas, Monica; Etain, B; Bellivier, F; Henry,, C.; Lagerberg, Trine Vik & Ringen, Petter Andreas [Show all 12 contributors for this article] (2014). Additive effects of childhood abuse and cannabis abuse on clinical expressions of bipolar disorders. Psychological Medicine. ISSN 0033-2917. 44(8), p. 1653–1662. doi: 10.1017/S0033291713002316.
• Lagerberg, Trine Vik; Kvitland, Levi Røstad; Aminoff, Sofie Ragnhild; Aas, Monica; Ringen, Petter Andreas & Andreassen, Ole Andreas [Show all 7 contributors for this article] (2014). Indications of a dose-response relationship between cannabis use and age at onset in bipolar disorder. Psychiatry Research. ISSN 0165-1781. 215(1), p. 101–104. doi: 10.1016/j.psychres.2013.10.029.
• Lange, Elisabeth; Nesvåg, Ragnar; Ringen, Petter Andreas; Hartberg, Cecilie Bhandari; Haukvik, Unn Kristin H. & Andreassen, Ole Andreas [Show all 8 contributors for this article] (2014). One year follow-up of alcohol and illicit substance use in first-episode psychosis: Does gender matter? Comprehensive Psychiatry. ISSN 0010-440X. 55(2), p. 274–282. doi: 10.1016/j.comppsych.2013.08.018.
• Ringen, Petter Andreas; Melle, Ingrid; Berg, Akiah Ottesen; Agartz, Ingrid; Spigset, Olav & Simonsen, Carmen Elisabeth [Show all 8 contributors for this article] (2013). Cannabis use and premorbid functioning as predictors of poorer neurocognition in schizophrenia spectrum disorder. Schizophrenia Research. ISSN 0920-9964. 143(1), p. 84–89. doi: 10.1016/j.schres.2012.10.021.
• 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.
• Lagerberg, Trine Vik; Sundet, Kjetil Søren; Aminoff, Sofie Ragnhild; Berg, Akiah Ottesen; Ringen, Petter Andreas & Andreassen, Ole Andreas [Show all 7 contributors for this article] (2011). Excessive cannabis use is associated with earlier age at onset in bipolar disorder. European Archives of Psychiatry and Clinical Neuroscience. ISSN 0940-1334. 261(6), p. 397–405. doi: 10.1007/s00406-011-0188-4.
• 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.
• Ringen, Petter Andreas; Vaskinn, Anja; Sundet, Kjetil Søren; Engh, John; Jónsdóttir, Halldóra & Simonsen, Carmen Elisabeth [Show all 10 contributors for this article] (2010). Opposite relationships between cannabis use and neurocognitive functioning in bipolar disorder and schizophrenia. Psychological Medicine. ISSN 0033-2917. 40(8), p. 1337–1347. doi: 10.1017/S0033291709991620.
• Engh, John; Friis, Svein; Birkenæs, Astrid Brate; Jónsdóttir, Halldóra; Klungsøyr, Ole & Ringen, Petter Andreas [Show all 10 contributors for this article] (2010). Delusions Are Associated With Poor Cognitive Insight in Schizophrenia. Schizophrenia Bulletin. ISSN 0586-7614. 36(4), p. 830–835. doi: 10.1093/schbul/sbn193.
• Nesvåg, Ragnar; Lange, Elisabeth; Færden, Ann; Barrett, Elisabeth Ann; Emilsson, Bjørn & Ringen, Petter Andreas [Show all 9 contributors for this article] (2010). The use of screening instruments for detecting alcohol and other drug use disorders in first-episode psychosis. Psychiatry Research. ISSN 0165-1781. 177(1-2), p. 228–234. doi: 10.1016/j.psychres.2010.01.007.
• Lagerberg, Trine Vik; Andreassen, Ole Andreas; Ringen, Petter Andreas; Berg, Akiah Ottesen; Larsson, Sara & Agartz, Ingrid [Show all 8 contributors for this article] (2010). Excessive substance use in bipolar disorder is associated with impaired functioning rather than clinical characteristics, a descriptive study. BMC Psychiatry. ISSN 1471-244X. 10(9). doi: 10.1186/1471-244X-10-9.
• Jónsdóttir, Halldóra; Ilner, Stein E. Opjordsmoen; Birkenæs, Astrid Brate; Engh, John; Ringen, Petter Andreas & Vaskinn, Anja [Show all 9 contributors for this article] (2010). Medication Adherence in Outpatients With Severe Mental Disorders Relation Between Self-Reports and Serum Level. Journal of Clinical Psychopharmacology. ISSN 0271-0749. 30(2), p. 169–175. doi: 10.1097/JCP.0b013e3181d2191e.
• Vaskinn, Anja; Sundet, Kjetil Søren; Friis, Svein; Ueland, Toril; Simonsen, Carmen Elisabeth & Birkenæs, Astrid Brate [Show all 11 contributors for this article] (2009). Using the Wisconsin Card Sorting Test to assess learning potential in normal IQ schizophrenia: Does it have potential? Nordic Journal of Psychiatry. ISSN 0803-9488. 63(5), p. 405–411. doi: 10.1080/08039480902879941.
• Engh, John; Friis, Svein; Birkenæs, Astrid Brate; Jónsdóttir, Halldóra; Klungsøyr, Ole & Ringen, Petter Andreas [Show all 10 contributors for this article] (2009). Delusions are associated with low cognitive insight in schizophrenia. Cognitive insight, delusions and hallucinations. Schizophrenia Bulletin. ISSN 0586-7614. doi: 10.1093/schbul/sbn193.
• Simonsen, Carmen Elisabeth; Sundet, Kjetil Søren; Vaskinn, Anja; Birkenæs, Astrid Brate; Engh, John & Hansen, Charlotte F [Show all 11 contributors for this article] (2008). Neurocognitive profiles in bipolar I and bipolar II disorder: differences in pattern and magnitude of dysfunction. Bipolar Disorders. ISSN 1398-5647. 10, p. 245–255.
• Vaskinn, Anja; Sundet, Kjetil Søren; Friis, Svein; Simonsen, Carmen Elisabeth; Birkenæs, Astrid Brate & Jónsdóttir, Halldóra [Show all 8 contributors for this article] (2008). Emotion perception and learning potential: Mediators between neurocognition and social problem-solving in schizophrenia? Journal of the International Neuropsychological Society. ISSN 1355-6177. 14, p. 279–288. doi: 10.1017/S1355017708080314.
• Jónsdóttir, Halldóra; Engh, John; Friis, Svein; Birkenæs, Astrid Brate; Ringen, Petter Andreas & Vaskinn, Anja [Show all 9 contributors for this article] (2008). Measurement of insight in patients with bipolar disorder. Are self-rated scales developed for patients with schizophrenia applicable? Journal of Nervous and Mental Disease. ISSN 0022-3018. 196, p. 333–335. doi: 10.1097/NMD.0b013e31816a62b2.
• Ringen, Petter Andreas; Lagerberg, Trine Vik; Birkenæs, Astrid Brate; Engh, JA; Færden, Ann & Jónsdóttir, Halldóra [Show all 12 contributors for this article] (2008). Differences in prevalence and patterns of substance use in schizophrenia and bipolar disorder. Psychological Medicine. ISSN 0033-2917. 38, p. 1241–1249. doi: 10.1017/S003329170700236X.
• Ringen, Petter Andreas; Melle, Ingrid; Birkenæs, Astrid Brate; Engh, John; Færden, Ann & Jónsdóttir, Halldóra [Show all 13 contributors for this article] (2008). Illicit drug use in patients with psychotic disorders compared with that in the general population: a cross-sectional study. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 117(2), p. 133–138. doi: 10.1111/j.1600-0447.2007.01135.x.
• Birkenæs, Astrid Brate; Birkeland, Kåre I.; Færden, Ann; Jónsdóttir, Halldóra; Ringen, Petter Andreas & Friis, Svein [Show all 9 contributors for this article] (2008). Dyslipidemia independent of body mass in anti psychotic-treated patients under real-life conditions. Journal of Clinical Psychopharmacology. ISSN 0271-0749. 28(2), p. 132–137. doi: 10.1097/JCP.0b013e318166c4f7.
• Ringen, Petter Andreas; Melle, Ingrid; Birkenæs, Astrid Brate; Engh, John; Færden, Ann & Vaskinn, Anja [Show all 9 contributors for this article] (2008). The level of illicit drug use is related to symptoms and premorbid functioning in severe mental illness. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 118, p. 297–304. doi: 10.1111/j.1600-0447.2008.01244.x.
• Vaskinn, Anja; Sundet, Kjetil Søren; Friis, Svein; Simonsen, Carmen Elisabeth; Birkenæs, Astrid Brate & Engh, John [Show all 10 contributors for this article] (2007). The effect of gender on emotion perception in schizophrenia and bipolar disorder. Acta Psychiatrica Scandinavica. ISSN 0001-690X. 116, p. 263–270. doi: 10.1111/j.1600-0447.2007.00991.x.
• Birkenæs, Astrid Brate; Opjordsmoen, Stein; Brunborg, Cathrine; Engh, John; Jonsdottir, Halldora & Ringen, Petter Andreas [Show all 12 contributors for this article] (2007). The level of cardiovascular risk factors in bipolar disorder equals that of schizophrenia: a comparative study. Journal of Clinical Psychiatry. ISSN 0160-6689. 68, p. 917–923.
• Engh, John; Friis, Svein; Birkenæs, Astrid Brate; Jonsdottir, Halldora; Ringen, Petter Andreas & Ruud, Torleif [Show all 9 contributors for this article] (2007). Measuring cognitive insight in schizophrenia and bipolar disorder: a comparative study. BMC Psychiatry. ISSN 1471-244X. doi: 10.1186/1471-244X-7-71.
• Birkenæs, Astrid Brate; Søgaard, Anne Johanne; Engh, John; Jonsdottir, Halldora; Ringen, Petter Andreas & Vaskinn, Anja [Show all 10 contributors for this article] (2006). Sociodemographic characteristics and cardiovascular risk factors in patients with severe mental disorders compared with the general population. Journal of Clinical Psychiatry. ISSN 0160-6689. 67, p. 425–433.
• Melle, Ingrid & Ringen, Petter Andreas (2005). Rus og psykoser. In Rund, BR (Eds.), Schizofreni. Hertervig Akademisk. ISSN 8292023917. p. 211–222. Show summary

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• Ringen, Petter Andreas (2020). Acute Coronary Syndrome in Patients With Schizophrenia: A Call for Cardiopsychiatry. Cardiology. ISSN 0008-6312. doi: 10.1159/000507328.
• Kvitland, Levi Røstad; Ringen, Petter Andreas; Aminoff, Sofie Ragnhild; Haram, Marit; Hellvin, Tone & Lagerberg, Trine Vik [Show all 9 contributors for this article] (2013). Cannabis use in the early phase of bipolar disorder: clinical characteristics in a cross-sectional sample. Bipolar Disorders. ISSN 1398-5647. 15, p. 118–118.
• Ringen, Petter Andreas; Melle, Ingrid; Berg, Akiah Ottesen; Simonsen, Carmen Elisabeth; Agartz, Ingrid & Sundet, Kjetil Søren [Show all 7 contributors for this article] (2011). THC IN URINE IN SCHIZOPHRENIA: ASSOCIATIONS WITH SYMPTOM LEVELS AND NEUROCOGNITIVE FUNCTIONING. Schizophrenia Bulletin. ISSN 0586-7614. 37, p. 279–280.
• Simonsen, Carmen Elisabeth; Sundet, Kjetil Søren; Vaskinn, Anja; Birkenaes, A; Engh, JA & Faerden, A [Show all 12 contributors for this article] (2009). NEUROCOGNITIVE DYSFUNCTION IN BIPOLAR AND SCHIZOPHRENIA SPECTRUM DISORDERS: THE ROLE OF HISTORY OF PSYCHOSIS. Schizophrenia Bulletin. ISSN 0586-7614. 35, p. 297–297.
• Lagerberg, Trine Vik; Sundet, Kjetil Søren; Amino, SR; Ringen, Petter Andreas; Andreassen, Ole Andreas & Melle, Ingrid (2009). Different age at onset of bipolar disorder for cannabis and alcohol abusing patients. Bipolar Disorders. ISSN 1398-5647. 11, p. 11–11.
• Sundet, Kjetil Søren; Vaskinn, Anja; Simonsen, Carmen Elisabeth; Hansen, Charlotte F; Birkenæs, Astrid Brate & Engh, John [Show all 11 contributors for this article] (2008). Timing of neurocognitive decline in schizophrenia and bipolar disorder. Schizophrenia Research. ISSN 0920-9964. 98, p. 36–36.
• Ringen, Petter Andreas; Lagerberg, Trine Vik; Birkenæs, Astrid Brate; Engh, John; Færden, Ann & Jónsdóttir, Halldóra [Show all 12 contributors for this article] (2008). Differences in prevalence and patterns of substance use in schizophrenia and bipolar disorder.
• Nakstad, Per Hjalmar; Server Alonso, Andrès; Engh, J; Jensen, J; Ringen, Petter Andreas & Agatz, Ingrid [Show all 7 contributors for this article] (2007). Incidental findings in research functional magnetic resonance imaging: neuroethical and practical considerations. Neuroradiology. ISSN 0028-3940. 49, p. 79–79.
• Ringen, Petter Andreas (2007). Medisin og psykiatri - stykkevis og delt? Tidsskrift for Den norske legeforening. ISSN 0029-2001. 127, p. 908–910.
• Engh, John; Jonsdottir, Halldora; Birkenæs, Astrid Brate; Ringen, Petter Andreas; Vaskinn, Anja & Ilner, Opjordsmoen Stein E. [Show all 8 contributors for this article] (2006). Assessment of insight in schizophrenia and bipolar disorder. Schizophrenia Research. ISSN 0920-9964. 81.
• Birkenæs, Astrid Brate; Søgaard, Anne Johanne; Engh, John; Jonsdottir, Halldora; Ringen, Petter Andreas & Vaskinn, Anja [Show all 10 contributors for this article] (2006). Socio-demographic characteristics and cardiovascular risk factors in patients with severe mental disorders compared with the general population. Schizophrenia Research. ISSN 0920-9964. 81, p. 39–40.
• Vaskinn, Anja; Birkenæs, Astrid Brate; Engh, John; Jonsdottir, Halldora; Ringen, Petter Andreas & Opjordsmoen, Stein [Show all 9 contributors for this article] (2005). Learning potential as a differentiating variable in schizophrenia. Schizophrenia Bulletin. ISSN 0586-7614. 31.

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