Doris Tove Kristoffersen

Forsker/statistiker, Ph.D

Forskning og analyse av helsetjenesten

Kontakt

Telefon: 21 07 73 23

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Besøksadresse

Sandakerveien 24c, Bygg D, 0473 Oslo

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Fagområder

Statistisk analyse, meta-analyse, nettverks-metaanalyse, programmering i R og SAS, datahåndtering, planlegging og analyser av klinisike fase I-IV studier

Faglig bakgrunn

Siv.ing, industriell matematikk med hovedfag i statistikk, PhD

Prosjekter

Forskningsprosjektet ELAPSE

Publikasjoner

Vitenskapelige artikler og bokkapitler Rapporter og bøker Andre

Charlotte Christine Gibbs, Jacob Thalamus, Doris Tove Kristoffersen, Martin Veel Svendsen, Øystein Lunde Holla, Kristian Heldal, Kristina Haugaa, Jan Hysing, (2019). QT prolongation predicts short-term mortality independent of comorbidity. Europace. ISSN 1099-5129. doi: 10.1093/europace/euz058.
Jon Helgeland, Oliver Tomic, Tonya Moen Hansen, Doris Tove Kristoffersen, Sahar Hassani, Anne Karin Lindahl, (2019). Postoperative wound dehiscence after laparotomy: a useful healthcare quality indicator? A cohort study based on Norwegian hospital administrative data. BMJ Open. ISSN 2044-6055. 9 (4), doi: 10.1136/bmjopen-2018-026422.
Doris Tove Kristoffersen, Jon Helgeland, Jocelyne Clench-Aas, Petter Laake, Marit Bragelien Veierød, (2018). Observed to expected or logistic regression to identify hospitals with high or low 30-day mortality?. PLoS ONE. ISSN 1932-6203. 13 (4), doi: 10.1371/journal.pone.0195248.
Daniel Semakula, Allen Nsangi, Andrew David Oxman, Matthew Prescott Oxman, Astrid Austvoll-Dahlgren, Sarah Rosenbaum, Angela Morelli, Claire Glenton, Simon Lewin, Margaret Kaseje, Iain Chalmers, Atle Fretheim, Doris Tove Kristoffersen, Nelson K. Sewankambo, (2017). Effects of the Informed Health Choices podcast on the ability of parents of primary school children in Uganda to assess claims about treatment effects: a randomised controlled trial. The Lancet. ISSN 0140-6736. 390 (10092), s 389-398. doi: 10.1016/S0140-6736(17)31225-4.
Jon Helgeland, Doris Tove Kristoffersen, Katrine Damgaard Skyrud, Anja Schou Lindman, (2016). Variation between Hospitals with Regard to Diagnostic Practice, Coding Accuracy, and Case-Mix. A Retrospective Validation Study of Administrative Data versus Medical Records for Estimating 30-Day Mortality after Hip Fracture. PLoS ONE. ISSN 1932-6203. 11 (5), doi: 10.1371/journal.pone.0156075.
Sahar Hassani, Anja Schou Lindman, Doris Tove Kristoffersen, Oliver Tomic, Jon Helgeland, (2015). 30-Day Survival Probabilities as a Quality Indicator for Norwegian Hospitals: Data Management and Analysis. PLoS ONE. ISSN 1932-6203. 10 (9), doi: 10.1371/journal.pone.0136547.
Doris Tove Kristoffersen, Jon Helgeland, Halfrid Waage, Jacob Thalamus, Dirk Clemens, Anja Schou Lindman, Liv Helen Rygh, Ole Tjomsland, (2015). Survival curves to support quality improvement in hospitals with excess 30-day mortality after acute myocardial infarction, cerebral stroke and hip fracture: A before-after study. BMJ Open. ISSN 2044-6055. 5 (3), doi: 10.1136/bmjopen-2014-006741.
Doris Tove Kristoffersen, Jon Helgeland, Jocelyne Clench-Aas, Petter Laake, Marit Bragelien Veierød, (2012). Comparing hospital mortality - how to count does matter for patients hospitalized for acute myocardial infarction (AMI), stroke and hip fracture. BMC Health Services Research. ISSN 1472-6963. 12 doi: 10.1186/1472-6963-12-364.
Cheryl L.L. Carling, Doris Tove Kristoffersen, Andrew David Oxman, Signe Agnes Flottorp, Atle Fretheim, Holger J Schünemann, Ellie A Akl, Jeph Herrin, Thomas D MacKenzie, Victor M Montori, (2010). The Effect of How Outcomes Are Framed on Decisions about Whether to Take Antihypertensive Medication: A Randomized Trial. PLoS ONE. ISSN 1932-6203. 5 (3), doi: 10.1371/journal.pone.0009469.
Einar Dale, Vanja Hårsaker, Doris Tove Kristoffersen, Øyvind Bruland, Dag Rune Olsen, (2010). CT Density in Lung Cancer Patients After Radiotherapy Sensitized by Metoclopramide A Subgroup Analysis of a Randomized Trial. Strahlentherapie und Onkologie (Print). ISSN 0179-7158. 186 (3), s 163-168. doi: 10.1007/s00066-010-2040-6.
Cheryl Lynn Leichter Carling, Doris Tove Kristoffersen, Signe Flottorp, Atle Fretheim, Andrew David Oxman, Holger J Schünemann, Elie A Akl, Jeph Herrin, Thomas D MacKenzie, Victor M Montori, (2009). The Effect of Alternative Graphical Displays Used to Present the Benefits of Antibiotics for Sore Throat on Decisions about Whether to Seek Treatment: A Randomized Trial. PLoS Medicine. ISSN 1549-1277. 6 (8), doi: 10.1371/journal.pmed.1000140.
Cheryl Carling, Doris Tove Kristoffersen, VM Montori, Jeph Herrin, Holger J Schünemann, Shaun Treweek, Ellie A Akl, Andrew David Oxman, (2009). The Effect of Alternative Summary Statistics for Communicating Risk Reduction on Decisions about Taking Statins: A Randomized Trial. PLoS Medicine. ISSN 1549-1277. 6 (8), doi: 10.1371/journal.pmed.1000134.
Cheryl Lynn Leichter Carling, Doris Tove Kristoffersen, Jeph Herrin, Shaun Treweek, Andrew David Oxman, Holger J Schünemann, Ellie A Akl, Victor M Montori, (2008). How Should the Impact of Different Presentations of Treatment Effects on Patient Choice Be Evaluated? A Pilot Randomized Trial. PLoS ONE. ISSN 1932-6203. 3 (11), doi: 10.1371/journal.pone.0003693.
MA O'Brien, S Rogers, Gro Jamtvedt, Andrew David Oxman, Jan Odgaard-Jensen, Doris Tove Kristoffersen, Signe Louise Forsetlund, D Bainbridge, N Freemantle, DA Davis, RB Haynes, EL Harvey, (2007). Educational outreach visits: effects on professional practice and health care outcomes (Review). Cochrane Database of Systematic Reviews. ISSN 1469-493X. (4), doi: 10.1002/14651858.CD000409.pub2.
Gunn Elisabeth Vist, KB Hagen, PJ Devereaux, D Bryant, Doris Tove Kristoffersen, Andrew David Oxman, (2007). Outcomes of patients who participate in randomised controlled trials compared to similar patients receiving similar interventions who do not participate (Review). Cochrane Database of Systematic Reviews. ISSN 1469-493X. (2), doi: 10.1002/14651858.MR000009.pub3..
Atle Fretheim, Kari Håvelsrud, Signe Flottorp, Graeme MacLennan, Doris Tove Kristoffersen, Jan Odgaard-Jensen, Andrew David Oxman, A Austvoll-Dahlgren, C Carling, Bjørn Bjorvatn, Ståle Pallesen, (2007). The Effects of Mandatory Prescribing of Thiazides for Newly Treated, Uncomplicated Hypertension: Interrupted Time-Series Analysis. PLoS Medicine. ISSN 1549-1277. 4 (7), s 1178-1186. doi: 10.1371/journal.pmed.0040232.
Gro Jamtvedt, Jane M. Young, Doris Tove Kristoffersen, Mary Ann O'Brien, Andrew David Oxman, (2006). Does telling people what they have been doing change what they do? A systematic review of the effects of audit and feedback. Quality and Safety in Healthcare. ISSN 1475-3898. 15 s 433-436. doi: 10.1136/qshc.2006.018549.
Atle Fretheim, Andrew David Oxman, Kari Håvelsrud, Shaun Treweek, Doris Tove Kristoffersen, Arild Bjørndal, (2006). Rational prescribing in primary care (RaPP): A cluster randomized trial of a tailored intervention. PLoS Medicine. ISSN 1549-1277. 3 doi: 10.1371/journal.pmed.0030134.
Shaun Treweek, Signe Agnes Flottorp, Atle Fretheim, Kari Håvelsrud, Doris Tove Kristoffersen, Andrew David Oxman, Olaf G Aasland, (2005). Hva gjør fastleger for å holde seg faglig oppdatert?. Tidsskrift for Den norske legeforening. ISSN 0029-2001. (Årg. 125, nr 3), s 304-306.
Shaun Treweek, Signe Agnes Flottorp, Atle Fretheim, Kari Håvelsrud, Doris Tove Kristoffersen, Andrew David Oxman, Olaf Gjerløw Aasland, (2005). Retningslinjer for allmennpraksis - blir de lest og blir de brukt?. Tidsskrift for Den norske legeforening. ISSN 0029-2001. (Årg. 125, nr 3), s 300-303.
Kari Håvelsrud, Signe Agnes Flottorp, Atle Fretheim, Doris Tove Kristoffersen, Andrew David Oxman, Shaun Treweek, Olaf Gjerløw Aasland, (2005). Hva gjør fastlegenes medarbeidere for å holde seg faglig oppdatert?. Tidsskrift for Den norske legeforening. ISSN 0029-2001. (Årg. 125, nr 3), s 307-309.
S Lindequist, F Rasmussen, HH Madsen, A Naeser, Kristin Bjartveit, Doris Tove Kristoffersen, AJ Klaveness, (1998). Diagnostic quality in hysterosalpingography. Comparison between iodixanol and iotrolan. Acta Radiologica. ISSN 0284-1851. 39 (6), s 730-733.
Barry Hogstrom, Doris Tove Kristoffersen, Bjørg Lundby, Marit Svaland, (1996). Safety of gadodiamide injection in two different age groups. Journal of Magnetic Resonance Imaging. ISSN 1053-1807. 6 (1), s 255-257.
NE Klow, Knut Levorstad, Knut Joachim Berg, U. Brodahl, Knut Endresen, Doris Tove Kristoffersen, B Laake, S Simonsen, AJ Tofte, Bjørg Lundby, (1993). Iodixanol in cardioangiography in patients with coronary artery disease. Tolerability, cardiac and renal effects. Acta Radiologica. ISSN 0284-1851. 34 (1), s 72-77.
Nils Petter Jørgensen, Jon Ø Nossen, Kari W. Borch, Aud Bodil Kristiansen, Doris Tove Kristoffersen, Bjørg Lundby, Liv Theodorsen, (1992). Safety and tolerability of iodixanol in healthy volunteers with reference to two monomeric X-ray contrast media. European Journal of Radiology. ISSN 0720-048X. 15 (3), s 252-257.
Jarl Åsbjørn Jakobsen, Bjørg Lundby, Doris Tove Kristoffersen, Kari W. Borch, John K Hald, Knut Joachim Berg, (1992). Evaluation of renal function with delayed CT after injection of nonionic monomeric and dimeric contrast media in healthy volunteers. Radiology. ISSN 0033-8419. 182 (2), s 419-4224.
Bjørg Bolstad, Kari W. Borch, BH Grynne, Bjørg Lundby, Jon Ø Nossen, Yngvil F. Kloster, Doris Tove Kristoffersen, Erik Andrew, (1991). Safety and tolerability of iodixanol. A dimeric, nonionic contrast medium: an emphasis on European clinical phases I and II. Investigative Radiology. ISSN 0020-9996. 26
Frode Rasmussen, U Dyreborg, C Larsen, Anne Waaler, Doris Tove Kristoffersen, (1990). Intravenous urography with a new non-ionic contrast media in a clinical phase III study: iopentol vs iohexol. Clinical Radiology. ISSN 0009-9260. 41 (1), s 37-41.
Erik Andrew, Henriette Eide, Per Fuglerud, Else Krüger Hagen, Doris Tove Kristoffersen, Marit Lambrechts, Anne Waaler, Morten Weiby, (1990). Publications on clinical trials with X-ray contrast media: differences in quality between journals and decades. European Journal of Radiology. ISSN 0720-048X. 10 (2), s 92-97.
Sophie Dorothea Fosså, Magne Kjell Tveit, Ole P. Børmer, Aud Moxnes, Nils Petter Jørgensen, H Ørjaseter, Doris Tove Kristoffersen, (1988). Relative bioavailability of oral low dose methotrexate. A comparison of 2 different formulations. European Journal of Clinical Pharmacology. ISSN 0031-6970. 34 (5), s 517-519.

Katrine Damgaard Skyrud, Doris Tove Kristoffersen, Tonya Moen Hansen, Jon Helgeland, (2019). Kvalitet i helsetjenesten: 30 dagers overlevelse og reinnleggelse etter sykehusinnleggelse. Resultater for 2017. ISBN 9788284060026. 48 s.
Doris Tove Kristoffersen, Tonya Moen Hansen, Oliver Tomic, Jon Helgeland, (2017). Kvalitetsindikatoren 30 dagers reinnleggelse etter sykehusopphold. Resultater for helseforetak og kommuner 2016. ISBN 9788280828675. 30 s.
Tonya Moen Hansen, Doris Tove Kristoffersen, Oliver Tomic, Jon Helgeland, (2017). Kvalitetsindikatoren 30 dagers overlevelse etter sykehusinnleggelse. Resultater for 2016. ISBN 978‐82‐8082‐866‐8. 49 s.
Tonya Moen Hansen, Doris Tove Kristoffersen, Oliver Tomic, Jon Helgeland, (2016). Kvalitetsindikatoren 30 dagers reinnleggelse etter sykehusopphold. Resultater for sykehus og kommuner 2015. ISBN 978‐82‐8082‐766‐1. 64 s.
Tonya Moen Hansen, Doris Tove Kristoffersen, Oliver Tomic, Jon Helgeland, (2016). Kvalitetsindikatoren 30 dagers overlevelse etter sykehusinnleggelse. Resultater for 2015. ISBN 978-82-8082-757-9. 50 s.
Doris Tove Kristoffersen, Tonya Moen Hansen, Anja Elsrud Schou Lindman, Oliver Tomic, Jon Helgeland, (2016). Kvalitetsindikatoren 30 dagers reinnleggelse etter sykehusopphold. Resultater for sykehus og kommuner 2014. ISBN 978‐82‐8082‐720‐3. 75 s.
Anja Schou Lindman, Doris Tove Kristoffersen, Tonya Moen Hansen, Oliver Tomic, Jon Helgeland, (2015). Kvalitetsindikatoren 30-dagers overlevelse etter innleggelse i norske sykehus – resultater for året 2014. ISBN 978-82-93479-01-7. 58 s.
Anja Schou Lindman, Doris Tove Kristoffersen, Sahar Hassani, Oliver Tomic, Jon Helgeland, (2015). 30-dagers reinnleggelse av eldre 2011–2013. Resultater for sykehus og kommuner. ISBN 978-82-8121-950-2. 58 s.
Anja Schou Lindman, Oliver Tomic, Sahar Hassani, Doris Tove Kristoffersen, Jon Helgeland, (2015). 30-dagers overlevelse - institusjonsrapporter - 2. utgave. ISBN 978-82-8121-940-3. 1650 s.
Anja Schou Lindman, Sahar Hassani, Doris Tove Kristoffersen, Oliver Tomic, Tomislav Dimoski, Jon Helgeland, (2014). 30-dagers overlevelse og reinnleggelse ved norske sykehus for 2013. ISBN 978-82-8121-912-0. 39 s.
Anja Schou Lindman, Oliver Tomic, Sahar Hassani, Doris Tove Kristoffersen, Jon Helgeland, (2014). 30-dagers overlevelse. Institusjonsrapporter. ISBN 978–82–8121–9328. 1715 s.
Anne Karin Lindahl, Ove Talsnes, Wender Figved, Anette Hylen Ranhoff, Elise Berg Vesterhus, Ole Kristian Roald, Doris Tove Kristoffersen, Jon Helgeland, (2014). Tiltak for økt overlevelse etter hoftebrudd. ISBN 978-82-8121-852-9. 25 s.
Jon Helgeland, Doris Tove Kristoffersen, Sahar Hassani, Tomislav Dimoski, Anja Schou Lindman, (2013). Overlevelse og reinnleggelser ved norske sykehus for 2012. ISBN 978-82-8121-831-4. 35 s.
Jon Helgeland, Katrine Damgaard, Doris Tove Kristoffersen, Anja Schou Lindman, Tomislav Dimoski, Liv Helen Rygh, (2011). 30 dagers overlevelse etter innleggelse i norske sykehus – interimanalyse fra forskningsprosjektet. ISBN 978-82-8121-412-5. 27 s.
Anne-Lise Lund Håheim, Katrine Damgaard, Doris Tove Kristoffersen, (2011). Beregning av volum av et utvalg undersøkelser og prosedyrer i spesialisthelsetjenesten for nettstedet Fritt sykehusvalg Norge. Del 2: undersøkelser og ikke-kirurgiske prosedyrer. ISBN 978-82-8121-326-5. 26 s.
Lise Lund Håheim, Mari Charlotte Wik Myhrstad, Geir Joner, Doris Tove Kristoffersen, (2008). Beregning av volum av et utvalg av kirurgiske prosedyrer i spesialisthelsetjenesten for nettstedet Fritt sykehusvalg Norge. ISBN 978-82-8121-200-8. 27 s.
Anne-Lise Lund Håheim, Geir Joner, Mari C.W. Myhrstad, Doris Tove Kristoffersen, (2008). Beregning av volum av et utvalg av kirurgiske prosedyrer i spesialisthelsetjenesten for nettstedet Fritt sykehusvalg Norge. Notat fra Kunnskapssenteret. ISBN 978-82-8121-200-8. 25 s.
Atle Fretheim, Kari Håvelsrud, Graeme MacLennan, Doris Tove Kristoffersen, Andy Oxman, (2006). Evaluering av nytt refusjonsvilkår for blodtrykksbehandling («tiazidregelen»). ISBN 82-8121-079-6. 14 s.
Marit Holden, Kjersti Aas, Arvid Lundervold, Otto Milvang, Geir Storvik, Giovanni Sebastini, Fred Godtlibsen, Doris Tove Kristoffersen, (1993). Assessment of tissue perfusion and characterization of lesions in dynamical MRI using contrast agents and statistical analysis - methodological considerations and clinical applications. 70 s.

Jon Helgeland, Oliver Tomic, Doris Tove Kristoffersen, Sahar Hassani, Anne Karin Lindahl, (2018). Is wound dehiscence after laparotomy a useful indicator of patient safety for Norwegian hospitals?.
Tonya Moen Hansen, Doris Tove Kristoffersen, Anja Elsrud Schou Lindman, Jon Helgeland, (2018). 30-day mortality after admission for pneumonia based on administrative data - variation between hospitals.
Doris Tove Kristoffersen, Jon Helgeland, Petter Laake, Marit Bragelien Veierød, (2018). Hospitals with high or low 30-day mortality - which method should we use to identify outliers?.
Tonya Moen Hansen, Doris Tove Kristoffersen, Oliver Tomic, Jon Helgeland, (2017). Avoidable hospital admissions, length of hospital stay and probability of 30-day hospital readmission among elderly in Norway.
Jon Petter Blixt, Alice Beathe Andersgaard, Halfrid Waage, Helge Stene-Johansen, Per Engstrand, Tonya Moen Hansen, Doris Tove Kristoffersen, Jon Helgeland, Ole Tjomsland, (2017). Experience with using 30-day survival curves to improve quality of care.
Doris Tove Kristoffersen, Tonya Moen Hansen, Oliver Tomic, Jon Helgeland, (2017). Unngåelige innleggelser, liggetid og sannsynlighet for akutt reinnleggelse av eldre pasienter i Norge.
Tonya Moen Hansen, Doris Tove Kristoffersen, Jon Helgeland, (2016). Overlevelse ved Sykehuset i Østfold: Oppfølging fra møtet 12.09.2016.
Doris Tove Kristoffersen, Tonya Moen Hansen, Oliver Tomic, Anja Schou Lindman, Jon Helgeland, (2016). Avoidable hospital admissions, length of hospital stay and probability of 30-day hospital readmission among elderly in Norway.
Doris Tove Kristoffersen, Jon Helgeland, Jocelyne Clench-Aas, Petter Laake, Marit Bragelien Veierød, (2016). Type I error and power for detecting hospitals with high or low 30-day mortality.
Doris Tove Kristoffersen, (2015). Re: Hvordan sammenlikner vi kvalitet i helsetjenesten?. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 135 (16), s 1427- doi: 10.4045/tidsskr.15.0825.
Doris Tove Kristoffersen, Anja Schou Lindman, Oliver Tomic, Jon Helgeland, (2015). Nasjonale kvalitetsindikatorer og resultater for Helgelandssykehuset HF.
Doris Tove Kristoffersen, Anja Schou Lindman, Oliver Tomic, Jon Helgeland, (2015). Re: Hvordan sammenlikner vi kvalitet i helsetjenesten?. Tidsskrift for Den norske legeforening. ISSN 0029-2001. 135 (16), s 1425-1426 doi: 10.4045/tidsskr.15.0821.
Anja Schou Lindman, Doris Tove Kristoffersen, Oliver Tomic, (2015). 30-dagers reinnleggelse av eldre etter utskrivning fra sykehus.
Anja Schou Lindman, Oliver Tomic, Doris Tove Kristoffersen, Sahar Hassani, Jon Helgeland, (2014). 30 days readmission among the elderly – a new quality indicator for hospital performance in Norway.
Doris Tove Kristoffersen, Halfrid P. Waage, Ole Tjomsland, Jon Helgeland, (2014). 30-day mortality – a trigger for successful quality improvement in a Norwegian hospital.
Doris Tove Kristoffersen, Anja Schou Lindman, Ole Tjomsland, Halfrid P. Waage, Jon Helgeland, (2013). Kaplan-Meier plots of 30-day mortality used for local improvement work.
Jon Helgeland, Katrine Damgaard, Anja Schou Lindman, Doris Tove Kristoffersen, (2012). Defining hospital stays.
Doris Tove Kristoffersen, Katrine Damgaard, Jon Helgeland, (2012). Accounting for patients transferred between hospitalswhen using mortality as a quality indicatorfor the comparison of hospitals.
Doris Tove Kristoffersen, Katrine Damgaard, Ole Tjomsland, Jon Helgeland, (2012). The use of Kaplan-Meier plots when comparing hospital mortality.
Doris Tove Kristoffersen, Jon Helgeland, Katrine Damgaard, Halfrid P. Waage, Per Urdahl, Jan Dag Solli, Håkon Tobro, Ellen Catharina Tveter Deilkås, Ole Tjomsland, (2012). Using 30-day mortality in patient safety improvement work for AMI and stroke patients.
Doris Tove Kristoffersen, Jon Helgeland, Katrine Damgaard, Dirk Clemens, Øyvind Sletten, Ola Einar Dahl, Ole Tjomsland, (2012). Using 30-day mortality data in patient safety improvement work for hip fracture patients.
Jon Helgeland, Katrine Damgaard, Anja Schou Lindman, Doris Tove Kristoffersen, (2011). Using 30-days mortality as a quality indicator for AMI, stroke and hip fracture. Preliminary results for Norwegian hospitals during 2005-2009.
Katrine Damgaard, Doris Tove Kristoffersen, Tomislav Dimoski, Jon Helgeland, (2011). Trends in mortality for AMI, stroke and hip fracture patients admitted to Norwegian hospitalsduring 1997-2001 and 2005-2009.
Doris Tove Kristoffersen, Katrine Damgaard, Jon Helgeland, (2011). How should patient transferrals be accounted forwhen calculating in-and-out-of-hospitalmortality as a quality indicator?.
Jon Helgeland, Jocelyne Clench-Aas, Doris Tove Kristoffersen, (2007). Validity of 30D mortality as a quality indicator for Norwegian hospitals.
Doris Tove Kristoffersen, Knut Joachim Berg, Jon Ø Nossen, Jean Stenstrøm, (1994). Establishing the reference ranges and stability for renal functional parameters. Controlled Clinical Trials. ISSN 0197-2456. 15 (3), s 86-86

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