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
Publikasjoner
- 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 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 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 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 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 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 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 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 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 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) 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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 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
- 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 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 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 s. 517-519.