Peder Andreas Halvorsen


Professor

Stillingsbeskrivelse

Professor ved fagenheten for primærmedisin, allmennmedisinsk forskningsgruppe.  Arbeidsoppgaver: Forskning, forskningsveiledning og undervisning innen allmenn- og samfunnsmedisinske tema. 


  • Ingeborg Forthun, Guri Rørtveit, Guro Haugen Fossum, Pål Jørgensen, Peder Andreas Halvorsen, Stein Nilsen m.fl.:
    Søvnforstyrrelser og forskrivning av hypnotika i allmennpraksis – en PraksisNett-studie
    SØVN 2023 ARKIV
  • Anne Herefoss Davidsen, Stian Andersen, Peder Andreas Halvorsen, Henrik Schirmer, Eirik Reierth, Hasse Melbye :
    Diagnostic accuracy of heart auscultation for detecting valve disease: a systematic review
    BMJ Open 2023 ARKIV / DOI
  • Sigurd Klemetsen Beldo, Nils Abel Aars, Tore Christoffersen, Anne-Sofie Furberg, Peder Andreas Halvorsen, Bjørge Hermann Hansen m.fl.:
    Criterion validity of the Saltin-Grimby Physical Activity Level Scale in adolescents : the Fit Futures Study
    PLOS ONE 2022 FULLTEKST / ARKIV / DOI
  • Ingrid Kjetså, Peder Andreas Halvorsen, Ane Sofie Kokkvoll :
    Age, income and sleep duration were associated with outcomes in children participating in weight management
    Acta Paediatrica 23. mars 2022 FULLTEKST / ARKIV / DOI
  • Espen Saxhaug Kristoffersen, Bjørn Bjorvatn, Peder Andreas Halvorsen, Stein Nilsen, Guro Haugen Fossum, Egil Andreas Fors m.fl.:
    The Norwegian PraksisNett: a nationwide practice-based research network with a novel IT infrastructure
    Scandinavian Journal of Primary Health Care 2022 ARKIV / DOI
  • Resha Al-Azzawi, Peder Andreas Halvorsen, Torsten Risør :
    Context and general practitioner decision-making - a scoping review of contextual influence on antibiotic prescribing
    BMC Family Practice 2021 ARKIV / DOI
  • Magnus Hjortdahl, Dorte Gyrd-Hansen, Peder Andreas Halvorsen :
    GP decisions to participate in emergencies: a randomised vignette study
    British Journal of General Practice Open 2021 ARKIV / DOI
  • Kassaye Yitbarek Yigzaw, Andrius Budrionis, Luis Marco Ruiz, Torje Dahle Henriksen, Peder Andreas Halvorsen, Johan Gustav Bellika :
    Privacy-preserving architecture for providing feedback to clinicians on their clinical performance
    BMC Medical Informatics and Decision Making 2020 ARKIV / DOI
  • Sigurd Beldo, Bente Morseth, Tore Christoffersen, Peder Andreas Halvorsen, Bjørge Hermann Hansen, Anne-Sofie Furberg m.fl.:
    Prevalence of accelerometer-measured physical activity in adolescents in Fit Futures - part of the Tromsø Study
    BMC Public Health 2020 ARKIV / DOI
  • Magnus Hjortdahl, Erik Zakariassen, Peder Andreas Halvorsen :
    Self reported involvement in emergency medicine among GPs in Norway
    Scandinavian Journal of Primary Health Care 2018 ARKIV / DOI
  • Andreas Pahle, Daniel Sørli, Ivar Sønbø Kristiansen, Trygve Sigvart Deraas, Peder Andreas Halvorsen :
    Practice variation in surgical procedures and IUD-insertions among general practitioners in Norway – a longitudinal study
    BMC Family Practice 2017 FULLTEKST / ARKIV / DOI
  • Juan Carlos Aviles Solis, Sophie Vanbelle, Peder Andreas Halvorsen, Nick Francis, Jochem W L Cals, Elena A Andreeva m.fl.:
    International perception of lung sounds: a comparison of classification across some European borders
    BMJ Open Respiratory Research 2017 ARKIV / DOI
  • Margrete Gaski, Peder Andreas Halvorsen, Ivar Johannes Aaraas, Olaf Gjerløw Aasland :
    Utdanner Universitetet i Tromsø - Norges arktiske universitet leger til å arbeide i distrikter?
    Tidsskrift for Den norske legeforening 2017 DOI
  • Johanna Laue, Hasse Melbye, Peder Andreas Halvorsen, Elena Andreeva, Maciek Godycki-Cwirko, Anja Wollny m.fl.:
    How do general practitioners implement decision-making regarding COPD patients with exacerbations? An international focus group study
    The International Journal of Chronic Obstructive Pulmonary Disease 2016 ARKIV / DOI
  • BL Barfoed, MS Paulsen, Palle Mark Christensen, Peder Andreas Halvorsen, Dorte E Jarbøl, ML Larsen m.fl.:
    Associations between patients’ adherence and GPs’ attitudes towards risk, statin therapy and management of non-adherence — a survey and register-based study
    Family Practice 2016 DOI
  • BL Barfoed, MS Paulsen, Palle Mark Christensen, Peder Andreas Halvorsen, Trine Kjær, ML Larsen m.fl.:
    Associations between patients’ risk attitude and their adherence to statin treatment – a population based questionnaire and register study
    BMC Family Practice 09. mars 2016 ARKIV / DOI
  • Helen Brandstorp, Peder Andreas Halvorsen, Birgitte Sterud, Bjørgun Haugland, Anna Luise Kirkengen :
    Primary care emergency team training in situ means learning in real context
    Scandinavian Journal of Primary Health Care 21. juli 2016 DATA / ARKIV / DOI
  • Magnus Hjortdahl, Peder Andreas Halvorsen, Mette Bech Risør :
    Rural GPs’ attitudes toward participating in emergency medicine: a qualitative study
    Scandinavian Journal of Primary Health Care 2016 ARKIV / DOI
  • Ivar Johannes Aaraas, Peder Andreas Halvorsen, Olaf Gjerløw Aasland :
    Supply of doctors to a rural region: Occupations of Tromsø medical graduates 1979–2012
    Medical Teacher 2015 ARKIV / DOI
  • Jon Helgheim Holte, Birgit Abelsen, Peder Andreas Halvorsen, Jan Abel Olsen :
    General practitioners’ altered preferences for private practice vs. salaried positions: a consequence of proposed policy regulations?
    BMC Health Services Research 2015 ARKIV / DOI
  • Helen Brandstorp, Anna Luise Kirkengen, Birgitte Sterud, Bjørgun Haugland, Peder Andreas Halvorsen :
    Leadership practice as interaction in primary care emergency team training
    Action research 10. mars 2015 ARKIV / DATA / DOI
  • BL Barfoed, DE Jarbøl, MS Paulsen, Palle Mark Christensen, Peder Andreas Halvorsen, JB Nielsen m.fl.:
    GPs' Perceptions of Cardiovascular Risk and Views on Patient Compliance: A Qualitative Interview Study.
    International Journal of Family Medicine 08. oktober 2015 ARKIV / DOI
  • Peder Andreas Halvorsen, Olaf Gjerløw Aasland, Ivar Sønbø Kristiansen :
    Decisions on statin therapy by patients’ opinions about survival gains: cross sectional survey of general practitioners
    BMC Family Practice 03. juli 2015 ARKIV / DOI
  • Anne Helen Hansen, Agnete Egilsdatter Kristoffersen, Olaug S Lian, Peder Andreas Halvorsen :
    Continuity of GP care is associated with lower use of complementary and alternative medical providers: a population-based cross-sectional survey
    BMC Health Services Research 2014 ARKIV / DOI
  • Peder Andreas Halvorsen, Maciek Godycki-Cwirko, Katrine Wennevold, Hasse Melbye :
    Would GPs advise patients with respiratory tract infections to refrain from exercise, stay indoors or stay in bed? Survey of GPs in Poland and Norway∗
    European Journal of General Practice 2014 DOI
  • Steinar Hunskaar, Anja Maria Brænd, Peder Andreas Halvorsen, Håvard Kjesbu Skjellegrind :
    Allmennmedisin
    Gyldendal Norsk Forlag A/S 2023
  • Guro Haugen Fossum, Peder Andreas Halvorsen :
    Using information technology to facilitate research in a practice-based research network - the story of PraksisNett
    2023
  • Olga Kostopoulou, Alastair D. Hay, Peder Andreas Halvorsen, Martine Nurek :
    PoCTs in primary care: a vignette-based experiment comparing two countries’ use of CRP
    2023
  • Guro Haugen Fossum, Peder Andreas Halvorsen :
    PraksisNett - et forskningsnettverk i primærhelsetjenesten
    2023
  • Peder Andreas Halvorsen :
    Anders Forsdahls pris 2023
    2023
  • Peder Andreas Halvorsen :
    Erfaringer med desentralisert medisinutdanning i nord sett fra primærhesletjenesten: Finnmarksmodellen
    2023
  • Peder Andreas Halvorsen :
    «Det regner ikke mere i Bergen.»
    2023
  • Halfdan Petursson, Minna Johansson, Thomas Mildestvedt, Peder Andreas Halvorsen :
    Preventing overdiagnosis meeting abstracts: 83 Guidelines for cardiovascular disease prevention: what’s time got to do with it?
    BMJ Evidence-Based Medicine 2023 DOI
  • Thomas Mildestvedt, Peder Andreas Halvorsen, Halfdan Petursson :
    Retningslinjer for forebyggende behandling i primærhelsetjenesten - tid for å prioritere måtehold
    Dagens medisin 06. oktober 2023 FULLTEKST
  • Anette Fosse, Birgit Abelsen, Anders Svensson, Peder Andreas Halvorsen :
    Sammen om helse i nord
    Nordnorsk Debatt 11. oktober 2023 FULLTEKST
  • Johan Gustav Bellika, Peder Andreas Halvorsen, Lisbeth Nilsen :
    Slik kan du sammenligne praksisen din med fastlegekolleger – uten å bli identifisert
    24. mai 2021
  • Johan Gustav Bellika, Kassaye Yitbarek Yigzaw, Peder Andreas Halvorsen, Oddny Johnsen :
    New tool makes it possible to do research on patient records without seeing sensitive information
    24. januar 2021 FULLTEKST
  • Johan Gustav Bellika, Kassaye Yitbarek Yigzaw, Peder Andreas Halvorsen, Oddny Johnsen :
    Nå kan forskere analysere pasientjournaler uten å se sensitiv informasjon
    04. september 2020 FULLTEKST
  • Peder Andreas Halvorsen, Mette Bech Risør, Hasse Melbye :
    The Stethoscope 2030: Towards Personalized Diagnostics With Digital Auscultation
    2019
  • Peder Andreas Halvorsen, Guri Rørtveit, Frank Sullivan, Tuomas H. Koskela, Johan Gustav Bellika, Stein Nilsen :
    Practice based Research Networks: A giant leap for primary care Research (workshop)
    2019
  • Bjørn Bjorvatn, Espen Saxhaug Kristoffersen, Peder Andreas Halvorsen, Egil Andreas Fors, Stein Nilsen, Guri Rørtveit :
    Ny infrastruktur for allmennmedisinsk forskning
    Tidsskrift for Den norske legeforening 2019 DOI
  • Bjørn Bjorvatn, Jørund Straand, Peder Andreas Halvorsen, Knut-Arne Wensaas, Johan Gustav Bellika, Egil Andreas Fors m.fl.:
    PraksisNett - et nettverk av fastlegepraksiser. En storsatsing på forskning i allmennpraksis.
    Utposten 2018 FULLTEKST
  • Magnus Hjortdahl, Peder Andreas Halvorsen :
    Decision making in primary care emergencies: When would general practitioners attendto call outs?
    2018
  • Magnus Hjortdahl, Peder Andreas Halvorsen, Torben Wisborg, Helen Brandstorp :
    Tverrfaglig simuleringstrening: Ingen skal jobbe alene på legevakt
    Dagens medisin 14. mars 2018
  • Magnus Hjortdahl, Peder Andreas Halvorsen, Helen Brandstorp :
    Kneler fastlegeordningen vil blålysmedisinen lammes
    VG : Verdens gang 18. januar 2018
  • Magnus Hjortdahl, Peder Andreas Halvorsen :
    Decision Making in Primary Care Emergencies: When Would General Practitioners Attend to Call Outs?
    2018
  • Peder Andreas Halvorsen, Trygve Sigvart Deraas, IS Kristiansen, AS Pahle, Unni Ringberg, A Schwartz :
    How should we approach practice variation? Standardization versus contextualization
    2017
  • Peder Andreas Halvorsen, Helen Brandstorp, M Hjortdahl, D Hogg, Ø Holte-Ambjørnsen, S Rørtveit :
    When should GPs participate in emergencyteams, and what is their contribution?
    2017
  • Martin Hotvedt, Peder Andreas Halvorsen :
    Kontrollert risikotaker
    Tidsskrift for Den norske legeforening 2016 DOI
  • Anne Helen Hansen, Agnete Egilsdatter Kristoffersen, Olaug S Lian, Peder Andreas Halvorsen :
    Continuity of the doctor-patient relationship may influence decisions to see a complementary and alternative medical care provider
    2014

  • De 50 siste resultatene fra Cristin vises på siden. Se alle arbeider i Cristin her →


    Forskningsinteresser

    Medical decision making, Decision psychology, Shared decision making, Risk perception, Risk communication, Public Health, Rural medicine


    Medlem i forskningsgruppe



    CV

    CV – Peder A. Halvorsen born 15th of June 1967
     
    Education
    University of Tromsø, cand. med.                                                                            1995
    Authorised physician                                                                                                 1997
    Approved specialist in general practice                                                                    2004
    University of Southern Denmark, Odense, ph.d.                                                     2008
     
    Employments
    Internship at Stokmarknes Hospital and the municipality of Hadsel, Norway        1995 - 1996
    General practitioner, Alta, Norway                                                                           1997 - 2002
    Disability evaluating physician, National Health Insurance, Alta, Norway             1998 - 2001
    Junior physician at the Outpatient Clinic of Psychiatry, Alta, Norway                    2003 - 2004
    General practitioner, Alta, Norway                                                                          2004 - 2011
    Director of research, National Centre for Rural Medicine, University of Tromsø  2008 - 2013
    Researcher, General Practice Research Unit, University of Tromsø                       2008 - 2014
    General practitioner, Alta, Norway                                                                          2012 -
    Professor, Department of Community Medicine, University of Tromsø                2014 -
    Regional research leader, The Norwegian Primary Care Research Network          2018 -
    Public health physician, Alta, Norway                                                                    2020 - 2021
     
    Research interests
    Medical decision making, Decision psychology, Shared decision making, Risk perception, Risk communication, Public Health, Rural medicine, Primary Care Research Networks
     
    Supervision
    Anne Helen Hansen, PhD 2013. Co-supervisor.
    Benedicte Barfoed, PhD 2016. Co-supervisor.
    Helen Brandstorp, PhD 2017. Co-supervisor.
    Magnus Hjortdahl, PhD 2018. Main supervisor.
    Juan Carlos Aviles Solis, PhD 2020. Co-supervisor.
    Sigurd Beldo, PhD 2021. Co-supervisor.
    Resha Al-Azzawi, PhD student. On-going. Co-supervisor.
    Anne Herefoss Davidsen, PhD student. On-going. Main supervisor.
     
    Karoline Damsgård Nilsen, master thesis 2017. Main supervisor.
    Øivind Holte-Ambjørnsen, master thesis 2017. Main supervisor.
    Ingrid Kjetså, master thesis 2018. Main supervisor.
    Ane Nesje, master thesis 2019. Main supervisor.
    Ragnhild Thomassen, master thesis 2019. Co-supervisor.
     
    Dissertation committees
    Monica Vold 2015 (third opponent/chairman)
    Sverre Rørtveit 2016 (first opponent)
     
    Committee work and leadership, international scientific congresses
    1.     17th Nordic Congress of General Practice, Tromsø, Norway 2011: Member of scientific committee
    2.     14th Biennial European Meeting, Society for Medical Decision Making, Oslo, Norway 2012: Co-chair
    3.     15th Biennial European Meeting, Society for Medical Decision Making, Antwerp, Belgium 2014: Co-chair
    4.     17th Biennial European Meeting, Society for Medical Decision Making, Leiden, The Netherlands 2018: Member of scientific committee
    5.     22nd Nordic Congress of General Practice, Stavanger, Norway 2022: Member of scientific committee
     
    Peer reviewed publications
     
    1.     Forthun I, Rørtveit G, Fossum GH, Jørgensen P, Halvorsen PA, Nilsen S, Straand J, Bellika JG, Bjorvatn B. Søvnforstyrrelser og forskrivning av hypnotika i allmennpraksis – en PraksisNett-studie.  Søvn 2023;(15)1:11-15.
    2.     Davidsen AH, Andersen S, Halvorsen PA, Schirmer H, Reierth E, Melbye H. Diagnostic accuracy of heart auscultation for detecting valve disease. A systematic review. BMJ Open. 2023 Mar 24;13(3):e068121.
    3.     Beldo SK, Aars NA, Christoffersen T, Furberg AS, Halvorsen PA, Hansen BH, Horsch A, Sagelv EH, Syed S, Morseth B. Criterion validity of the Saltin-Grimby Physical Activity Level Scale in adolescents. The Fit Futures Study. PLoS One. 2022 Sep1;17(9):e0273480. 
    4.     Kristoffersen ES, Bjorvatn B, Halvorsen PA, Nilsen S, Fossum GH, Fors EA, Jørgensen P, Øxnevad-Gundersen B, Gjelstad S, Bellika JG, Straand J, Rørtveit G. The Norwegian PraksisNett: a nationwide practice-based research network with a novel IT infrastructure. Scand J Prim Health Care. 2022;40(2):217-226
    5.     Kjetså I, Halvorsen PA, Kokkvoll AS. Age, income and sleep-duration were associated with outcomes in children participating in weight management. Acta Paediatr 2022;111:1412-1419
    6.     Al-Azzawi R, Halvorsen PA, Risør T. Context and general practitioner decision-making - a scoping review of contextual influence on antibiotic prescribing. BMC Fam Pract  2021;22:225.
    7.     Hjortdahl M, Gyrd-Hansen D, Halvorsen PA. GP decisions to participate in emergencies: a randomised vignette study. BJGP Open. 2021 Jan 19:bjgpopen20X101153.
    8.     Beldo SK, Morseth B, Christoffersen T, Halvorsen PA, Hansen BH, Furberg AS, Ekelund U, Horsch A. Prevalence of accelerometer-measured physical activity in adolescents in Fit Futures – part of the Tromsø Study. BMC Public Health 2020;20:1127. 
    9.     Yigzaw KY, Budrionis A, Marco-Ruiz L, Henriksen TD, Halvorsen PA, Bellika JG. Privacy-preserving architecture for providing feedback to clinicians on their clinical performance. BMC Med Inform Decis Mak 2020;20:116
    10.  Hjortdahl M, Zakariassen E, Halvorsen PA. Self reported involvement in emergency medicine among GPs in Norway. Scand J Prim Health Care. 2018;36:161-169
    11.  Aviles-Solis JC, Vanbelle S, Halvorsen PA, Francis N, Cals JWL, Andreeva EA, Marques A, Piirilä P, Pasterkamp H, Melbye H. International perception of lung sounds: a ccomparison of classification across some European borders. BMJ Open Resp Res 2017 Dec 18;4(1):e000250
    12.  Gaski M, Halvorsen PA, Aaraas IJ, Aasland OG. Does the University of Tromsø - The Arctic University of Norway educate doctors to work in rural communities? Tidsskr Nor Laegeforen 2017;137(14-15)
    13.  Pahle AS, Sørli D, Kristiansen IS, Deraas TS, Halvorsen PA. Practice variation in surgical procedures and IUD-insertions among general practitioners in Norway - a longitudinal study. BMC Fam Pract. 2017;18(1):7.
    14.  Laue J, Melbye H, Halvorsen PA, Andreeva E, Godycki-Cwirko M, Wollny A, Francis N, Spigt M, Kung K, Bech Risør M. How do general practitioners implement decision-making regarding COPD patients with exacerbations? An international focus group study.  Int J Chron Obstruct Pulmon Dis 2016;11:3109-19.
    15.  Hjortdahl M, Halvorsen PA, Risør MB. Rural GP’s attitudes towards participating in emergency medicine: A qualitative study. Scand J Prim Health Care 2016 34:377-384.
    16.  Brandstorp H, Halvorsen PA, Sterud B, Haugland B, Kirkengen AL. Primary care emergency team training in situ means learning in real context. Scand J Prim Health Care. 2016;34:295-303
    17.  Barfoed BL, Paulsen MS, Christensen PM, Halvorsen PA, Kjær T, Larsen ML, Larsen PV, Nielsen JB, Søndergaard J, Jarbøl DE. Associations between patients' risk attitude and their adherence to statin treatment - a population based questionnaire and register study. BMC Fam Pract. 2016;17:28.
    18.  Barfoed BL, Paulsen MS, Christensen PM, Halvorsen PA, Jarbøl DE, Larsen ML, Munch MR, Søndergaard J, Nielsen JB. Associations between patients’ adherence and GPs’ attitudes towards risk, statin therapy and management of non-adherence—a survey and register-based study. Fam Pract. 2016;33:140-7.
    19.  Barfoed BL, Jarbøl DE, Paulsen MS, Christensen PM, Halvorsen PA, Nielsen JB, Søndergaard J. GPs’ Perceptions of Cardiovascular Risk and Views on Patient Compliance: A Qualitative Interview Study. Int J Family Med 2015;2015:214146.
    20.  Halvorsen PA, Aasland OG, Kristiansen IS. Decisions on statin therapy by patients' opinions about survival gains: Cross sectional survey of general practitioners. BMC Fam Pract 2015;16:79.
    21.  Aaraas IJ, Halvorsen PA, Aasland OG. Supply of doctors to a rural region: Occupations of Tromsø medical graduates 1979-2012. Med Teach. 2015 Mar 26:1-5.
    22.  Holte JH, Abelsen B, Halvorsen PA, Olsen JA. General practitioners’ altered preferences for private practice vs. salaried positions: a consequence of proposed policy regulations? BMC Health Serv Res. 2015;15:119.
    23.  Brandstorp H, Kirkengen AL, Sterud B, Haugland B, Halvorsen PA. Leadership practice as interaction in primary care emergency team training. Action Research 2015;13:84-101.
    24.  Hansen A, Kristoffersen AE, Lian OS, Halvorsen PA. Continuity of GP care is associated with lower use of complementary and alternative medical providers: a population-based cross-sectional survey. BMC Health Serv Res. 2014;14:629.
    25.  Halvorsen PA, Godycki-Cwirko M, Wennevold K, Melbye H. Would GPs advice patients with respiratory tract infections to refrain from exercise, stay indoors or stay in bed? Survey of GPs in Poland and Norway. Eur J Gen Pract. 2014;20:209-13.
    26.  Oshaug K, Halvorsen PA, Melbye H. Should chest examination be reinstated in the early diagnosis of COPD? Int J Chron Obstruct Pulmon Dis 2013;8:369–377
    27.  Hansen AH, Halvorsen PA, Aaraas IJ, Førde OH. Continuity of GP care is related to reduced specialist health care utilisation. Br J Gen Pract 2013;63:482-9
    28.  Halvorsen PA, Edwards A, Aaraas IJ, Aasland OG, Kristiansen IS. What professional activities do general practitioners find most meaningful? cross sectional survey of Norwegian general practitioners. BMC Fam Pract 2013;14:41
    29.  Brandstorp H, Kirkengen AL, Halvorsen PA, Haugland B, Sterud B. Training interaction in primary care emergency teams: the role of the patient. Int J Pers Cent Med. 2012;2:656-63
    30.  Halvorsen PA, Steinert S, Aaraas IJ. Remuneration and organization in general practice: Do GPs prefer private practice or salaried positions? Scand J Prim Health Care. 2012;30:229–233
    31.  Hansen AH, Halvorsen PA, Ringberg U, Førde OH. Socio-economic inequalities in health care utilisation in Norway: a population based cross-sectional survey.  BMC Health Serv Res. 2012;12:336.
    32.  Hansen AH, Halvorsen PA, Førde OH. The ecology of medical care in Norway: wide use of general practitioners may not necessarily keep patients out of hospitals. J Public Health Res 2012;1:e28
    33.  Melbye H, Joensen L, Risør MB, Halvorsen PA. Symptoms of respiratory tract infection and associated care-seeking in subjects with and without obstructive lung disease; The Tromso Study: Tromso 6. BMC Pulm Med. 2012;12:51.
    34.  Halvorsen PA, Wisløff TF, Støvring H, Aasland O, Kristiansen IS. Therapeutic decisions by number needed to treat and survival gains: a cross-sectional survey of lipid-lowering drug recommendations. Br J Gen Pract 2011;61:477-83.
    35.  Halvorsen PA, Wennevold K, Fleten N, Muras M, Kowalczyk A, Godycki-Cwirko M, Melbye H. Decisions on sick leave certifications for acute airways infections based on vignettes: A cross-sectional survey of GPs in Norway and Poland. Scand J Prim Health Care 2011;29:110-6
    36.  Gyrd-Hansen D, Halvorsen P, Nexøe J, Nielsen J, Støvring H, Kristiansen I. Joint and separate evaluation of risk reduction: impact on sensitivity to risk reduction magnitude in the context of 4 different risk information formats. Med Decis Making 2011;31:E1-E10.
    37.  Halvorsen PA, Selmer RM, Kristiansen IS. Anticipated longevity among lay people screened for cardiovascular risk factors: a cross-sectional questionnaire study. Scand J Public Health 2010;38:481-8.
    38.  Nexøe J, Halvorsen PA, Kristiansen IS. Critiques of the risk concept--valid or not? Scand J Public Health 2007;35:648-54.
    39.  Halvorsen PA, Selmer R, Kristiansen IS. Different ways to describe the benefits of risk reducing treatments: a randomized trial. Ann Intern Med 2007;146:848-56.
    40.  Kristiansen IS, Halvorsen PA, Gyrd-Hansen D. Influenza pandemic: perception of risk and individual precautions in a general population. Cross sectional study. BMC Public Health 2007;7:48.
    41.  Gyrd-Hansen D, Halvorsen PA, Kristiansen IS. Willingness-to-pay for a statistical life in the times of a pandemic. Health Econ 2007;17:55-66
    42.  Halvorsen PA, Kristiansen IS. Decisions on drug therapies by numbers needed to treat: a randomized trial. Arch Intern Med 2005;165:1140-6.
    43.  Wisloff T, Halvorsen PA, Kristiansen IS. Antall som må behandles (NNT) – misvisende, misforstått, misbrukt?[Number needed to treat (NNT)-- misleading, misunderstood, misused?] Tidsskr Nor Laegeforen 2004;124:1926-9.
    44.  Halvorsen PA, Kristiansen IS, Aasland OG, Forde OH. Medical doctors' perception of the "number needed to treat" (NNT). A survey of doctors' recommendations for two therapies with different NNT. Scand J Prim Health Care 2003;21:162-6.
    45.  Halvorsen PA, Kristiansen IS. Er teleradiologi i primærhelsetjenesten
    kostnadsbesparende? [Does teleradiography in primary health care reduce costs?]
    Tidsskr Nor Laegeforen 1997;117:1611-5.
    46.  Halvorsen PA, Kristiansen IS. Radiology services for remote communities: cost
    minimisation study of telemedicine. BMJ 1996;312:1333-6.