Background
Statistician
Projects and publications
Projects
- A Scandinavian cohort of pregnant women in opioid maintenance treatment during pregnancy: long term consequences for the child (ScopeOMT)
- Hip fractures in Norway: Predictors, incidence and survival. Norwegian Epidemiologic Osteoporosis Studies (NOREPOS)
- Hva slags legemiddelbehandling får psykosepasienter i Norge? (Psychopharm)
- Norsk sykdomsbyrdeprosjekt: Risikofaktorprosjekt
- Prescription drug use and subsequent morbidity and mortality
- Risikofaktorer for sykdom, svangerskapsutfall og årsaksspesifikk dødelighet
Scientific articles and book chapters
- Anne Efjestad, Hege Ihle-Hansen, Vidar Hjellvik, Knut Engedal, Hege Salvesen Blix, (2019). Drug Use before and after Initiating Treatment with Acetylcholinesterase Inhibitors. Dementia and geriatric cognitive disorders extra s. 196-206. doi: 10.1159/000497307
- Vidar Hjellvik, Marie L. de Bruin, Sven Ove Samuelsen, Øystein Karlstad, Morten Andersen, Jari Haukka, Peter Vestergaard, Frank de Vries, Kari Furu, (2019). Adjusting for unmeasured confounding using validation data: Simplified two-stage calibration for survival and dichotomous outcomes. Statistics in Medicine doi: 10.1002/sim.8131
- Olav Magnus Fredheim, Svetlana Skurtveit, Marte Handal, Vidar Hjellvik, (2019). A complete national cohort study of prescriptions of analgesics and benzodiazepines to cancer survivors in Norway 10 years after diagnosis. Pain s. 852-859. doi: 10.1097/j.pain.0000000000001459
- Marta Ebbing, Anne Reneflot, Vidar Hjellvik, Øyvind Næss, Helle Margrete Meltzer, (2018). Kunnskapskilder for folkehelse.
- Ragnar Nesvåg, Jørgen Gustav Bramness, Marte Handal, Ingeborg Hartz, Vidar Hjellvik, Svetlana Skurtveit, (2018). The incidence, psychiatric co-morbidity and pharmacological treatment of severe mental disorders in children and adolescents. European psychiatry s. 16-22. doi: 10.1016/j.eurpsy.2017.12.009
- Anders Engeland, Tone Bjørge, Kari Klungsøyr, Vidar Hjellvik, Svetlana Skurtveit, Kari Furu, (2018). Trends in prescription drug use during pregnancy and postpartum in Norway, 2005 to 2015. Pharmacoepidemiology and Drug Safety s. 995-1004. doi: 10.1002/pds.4577
- Svetlana Skurtveit, Jørgen Gustav Bramness, Vidar Hjellvik, Ingeborg Hartz, Ragnar Nesvåg, Lars Johan Hauge, Marte Handal, (2018). Increase in diagnosis of depressive disorders contributes to the increase in antidepressant use in adolescents. Acta Psychiatrica Scandinavica s. 413-421. doi: 10.1111/acps.12877
- Anne Efjestad, Hege Ihle-Hansen, Vidar Hjellvik, Hege Salvesen Blix, (2017). Comedication and treatment length in users of acetylcholinesterase inhibitors. Dementia and geriatric cognitive disorders extra s. 30-40. doi: 10.1159/000454948
- Anna But, Marie L de Bruin, Marloes T Bazelier, Vidar Hjellvik, Morten Andersen, Anssi Auvinen, Jakob Starup-Linde, Marjanka K Schmidt, Kari Furu, Frank de Vries, Øystein Karlstad, Nils Ekström, Jari Haukka, (2017). Cancer risk among insulin users: comparing analogues with human insulin in the CARING five-country cohort study. Diabetologia s. 1691-1703. doi: 10.1007/s00125-017-4312-5
- Solveig Sakshaug, Marte Handal, Vidar Hjellvik, Christian Lie Berg, Åse Ripel, Ingebjørg G. Gustavsen, Jørg Mørland, Svetlana Skurtveit, (2017). Long-term Use of Z-Hypnotics and Co-Medication with Benzodiazepines and Opioids. Basic & Clinical Pharmacology & Toxicology s. 292-298. doi: 10.1111/bcpt.12684
- Ragnar Nesvåg, Ingeborg Hartz, Jørgen Gustav Bramness, Vidar Hjellvik, Marte Handal, Svetlana Skurtveit, (2016). Mental disorder diagnoses among children and adolescents who use antipsychotic drugs. European Neuropsychopharmacology s. 1412-1418. doi: 10.1016/j.euroneuro.2016.07.001
- Ingeborg Hartz, Svetlana Skurtveit, Vidar Hjellvik, Kari Furu, Ragnar Nesvåg, Marte Handal, (2016). Antidepressant drug use among adolescents during 2004–2013: a population-based register linkage study. Acta Psychiatrica Scandinavica s. 420-429. doi: 10.1111/acps.12633
- Marte Handal, Solveig Sakshaug, Vidar Hjellvik, Christian Lie Berg, Svetlana Skurtveit, (2015). Kjønnsforskjeller i bruk av vanedannende legemidler i Norge. Norsk Farmaceutisk Tidsskrift s. 27-31.
- Hege Salvesen Blix, DIDRIK FRIMANN VESTRHEIM, Vidar Hjellvik, Dagfinn Skaare, Andreas Christensen, Martin Steinbakk, (2015). Antibiotic prescriptions and cycles of Mycoplasma pneumoniae infections in Norway: can a nationwide prescription register be used for surveillance?. Epidemiology and Infection s. 1884-1892. doi: 10.1017/S0950268814002908
- Bjørn Heine Strand, Ellen Melbye Langballe, Vidar Hjellvik, Marte Handal, Øyvind Næss, Gun Peggy Knudsen, Helga Refsum, Kristian Tambs, Per Nafstad, Henrik Schirmer, Astrid Liv Mina Bergem, Randi Selmer, Knut Arne Engedal, Per Magnus, Espen Bjertness, (2013). Midlife vascular risk factors and their association with dementia deaths: Results from a Norwegian prospective study followed up for 35 years. Journal of Neurological Sciences s. 124-130. doi: 10.1016/j.jns.2012.10.018
- Øystein Karlstad, Jakob Starup-Linde, Peter Vestergaard, Vidar Hjellvik, Marloes T Bazelier, Marjanka K Schmidt, Morten Andersen, Anssi Auvinen, Jari Haukka, Kari Furu, Frank de Vries, Marie L De Bruin, (2013). Use of insulin and insulin analogs and risk of cancer - systematic review and meta-analysis of observational studies. Current Drug Safety s. 333-348. doi: 10.2174/15680266113136660067
- Jakob Starup-Linde, Øystein Karlstad, Stine Aistrup Eriksen, Peter Vestergaard, Heleen K Bronsveld, Frank de Vries, Morten Andersen, Anssi Auvinen, Jari Haukka, Vidar Hjellvik, Marloes T Bazelier, Anthonius de Boer, Kari Furu, Marie L De Bruin, (2013). CARING (CAncer Risk and INsulin analoGues): the association of diabetes mellitus and cancer risk with focus on possible determinants - a systematic review and a meta-analysis. Current Drug Safety s. 296-332. doi: 10.2174/15748863113086660071
- Vidar Hjellvik, Randi Selmer, Håkon K. Gjessing, Aage Tverdal, Stein Emil Vollset, (2013). Body mass index, smoking, and risk of death between 40 and 70 years of age in a Norwegian cohort of 32,727 women and 33,475 men. European Journal of Epidemiology (EJE) s. 35-43. doi: 10.1007/s10654-012-9758-7
- Vidar Hjellvik, Solveig Sakshaug, Hanne Strøm, (2012). Body mass index, triglycerides, glucose, and blood pressure as predictors of type 2 diabetes in a middle-aged Norwegian cohort of men and women. Clinical Epidemiology s. 213-224. doi: 10.2147/CLEP.S31830
- Vidar Hjellvik, Knut Arne Engedal, Marte Handal, Trond Peder Flaten, Ellen Melbye Langballe, Randi Selmer, Bjørn Heine Strand, (2012). Dementia in the National Cause of Death Registry in Norway 1969-2010. Norsk Epidemiologi s. 217-224.
- Hege Salvesen Blix, Vidar Hjellvik, (2012). Økt bruk av antibiotika blant 19-åringer i mai. Tidsskrift for Den norske legeforening s. 1084-1088. doi: 10.4045/tidsskr.11.1122
- Vidar Hjellvik, Milada Mahic, Aage Tverdal, (2012). Utdanning og legemiddelbruk. Tidsskrift for Den norske legeforening s. 2166-2170. doi: 10.4045/tidsskr.11.1431
- Hege Salvesen Blix, Vidar Hjellvik, Irene Litleskare, Marit Rønning, Aage Tverdal, (2011). Cigarette smoking and risk of subsequent use of antibacterials: a follow-up of 365117 men and women. Journal of Antimicrobial Chemotherapy s. 2159-2167. doi: 10.1093/jac/dkr273
- Aage Tverdal, Vidar Hjellvik, Randi Marie Selmer, (2011). Coffee intake and oral-oesophageal cancer: follow-up of 389 624 Norwegian men and women 40-45 years. British Journal of Cancer s. 157-161. doi: 10.1038/bjc.2011.192
- Vidar Hjellvik, Aage Tverdal, Hanne Strøm, (2011). Boiled Coffee Intake and Subsequent Risk for Type 2 Diabetes. Epidemiology s. 418-421. doi: 10.1097/EDE.0b013e31821083e3
- Vidar Hjellvik, Aage Tverdal, Kari Furu, (2010). Body mass index as predictor for asthma: a cohort study of 118,723 males and females. European Respiratory Journal s. 1235-1242. doi: 10.1183/09031936.00192408
- Anne Gerd Granås, Christian Lie Berg, Vidar Hjellvik, Cecilie Haukereid, Arvid Kronstad, Hege Salvesen Blix, Bente Kilhovd, Kirsten K Viktil, Anne Marie Horn, (2010). Evaluating categorisation and clinical relevance of drug-related problems in medication reviews. Pharmacy World & Science s. 394-403. doi: 10.1007/s11096-010-9385-x
- Jørgen G. Bramness, Fredrik A Walby, Vidar Hjellvik, Randi Marie Selmer, Aage Tverdal, (2010). Self-reported mental health and its gender differences as a predictor of suicide in the middle-aged. American Journal of Epidemiology s. 160-166. doi: 10.1093/aje/kwq091
- Aage Tverdal, Vidar Hjellvik, Randi Marie Selmer, (2008). Heart rate and mortality from cardiovascular causes: a 12 year follow-up study of 379 843 men and women aged 40-45 years. European Heart Journal s. 2772-2781. doi: 10.1093/eurheartj/ehn435
- Vidar Hjellvik, Dag Bjarne Tjøstheim, Olav Rune Godø, (2007). Can the precision of bottom trawl indices be increased by using simultaneously collected acoustic data? The Barents Sea experience. Canadian Journal of Fisheries and Aquatic Sciences s. 1390-1402. doi: 10.1139/F07-101
- Anders Løland, Magne Aldrin, Egil Ona, Vidar Hjellvik, Jens Christian Holst, (2007). Estimating and decomposing total uncertainty for survey-based abundance estimates of Norwegian spring-spawning herring. ICES Journal of Marine Science
- Vidar Hjellvik, Olav Rune Godø, Dag Bjarne Tjøstheim, (2004). Diurnal variation in acoustic densities: why do we see less in the dark?. Canadian Journal of Fisheries and Aquatic Sciences s. 2237-2254.
- Vidar Hjellvik, Rong Chen, Dag Bjarne Tjøstheim, (2004). Nonparametric estimation and testing in panels of intercorrelated time series. Journal of Time Series Analysis s. 831-872.
- Vidar Hjellvik, Olav Rune Godø, Dag Bjarne Tjøstheim, (2004). Decomposing and explaining the variability of bottom trawl survey data from the Barents Sea. Sarsia s. 196-210.
- Vidar Hjellvik, Olav Rune Godø, Dag Bjarne Tjøstheim, (2002). Modelling diurnal variation in bottom trawl survey catches: does it pay to adjust?. Canadian Journal of Fisheries and Aquatic Sciences s. 33-48.
- Vidar Hjellvik, Olav Rune Godø, Dag Bjarne Tjøstheim, (2002). The measurement error of marine survey registrations: the bottom trawl case. Fishery Bulletin
- Vidar Hjellvik, Olav Rune Godø, Dag Tjostheim, (2001). Modelling diurnal variations in marine populations. Biometrics s. 189-196.
- Vidar Hjellvik, Dag Bjarne Tjøstheim, (1999). Residual variance estimates and order determination in panels of intercorrelated time series. s. 385-409.
- Vidar Hjellvik, Dag Bjarne Tjøstheim, (1999). Modeling panels of intercorrelated autoregressive time series. Biometrika s. 572-590.
- Vidar Hjellvik, Q. Yao, Dag Bjarne Tjøstheim, (1998). Local polynomial approximation and linearity testing. Journal of Statistical Planning and Inference s. 295-321.
- Vidar Hjellvik, Dag Bjarne Tjøstheim, (1996). Nonparametric statistics for testing linearity and serial independence. Nonparametric Statistics s. 223-251.
- Dag Bjarne Tjøstheim, Vidar Hjellvik, (1995). Nonparametric tests of linearity for time series. Biometrika s. 351-368.
Reports and books
- Jørgen Bramnes, Lena Catherine Lossius Westby, Vidar Hjellvik, Halvor Fauske, Lars Lien, (2018). Legemidler og deres håndtering i barnverninstitusjoner
- Marit Rønning, Vidar Hjellvik, Christian Lie Berg, Milada Mahic, Aage Tverdal, (2009). Kartlegging og vurdering av sosiale ulikheter i tilgangen til legemidler på blå resept
- Vidar Hjellvik, (1997). Nonparametric tests of linearity for time series and panels of time se ries
Others
- Svetlana Skurtveit, Yury Kiselev, Marte Handal, Camilla Stoltenberg, Ted Reichborn-Kjennerud, Pål Suren, Alexandra Havdahl, Vidar Hjellvik, (2019). Co-Occurring Neuropsychiatric Diagnoses and Use of Psychotropic Drugs in Children with Autism Spectrum Disorder.
- Ingvild Holdø, Jørgen Gustav Bramness, Marte Handal, Berit Marina Hjelde Hansen, Vidar Hjellvik, Svetlana Skurtveit, (2017). Infants With dispensed hypnotics have a greater risk of developing hyperkinetic disorder in School age.
- Ingvild Holdø, Jørgen Gustav Bramness, Svetlana Skurtveit, Marte Handal, Berit Hjelde Hansen, Vidar Hjellvik, (2017). Infants with Sleep Problems have a Greater Risk of Developing ADHD in school age.
- Marte Handal, Milada Mahic, Vidar Hjellvik, Ingunn Olea Lund, Inger Øhman, Birgitta Nordstedt Wikner, Helle Kieler, Mette Nørgaard, Sonia Hernandez-Diaz, Jørgen Gustav Bramness, Edle Ravndal, Erja Halmesmæki, Svetlana Skurtveit, (2016). Background and design: A Scandinavian cohort of pregnant women in opioid maintenance treatment during pregnancy: long term consequences for the child (ScopeOMT).
- Ingeborg Hartz, Svetlana Skurtveit, Vidar Hjellvik, Kari Furu, Ragnar Nesvåg, Marte Handal, (2015). Antidepressant drug use among adolescents during 2004-2013 – a population-based linkage study between the Nationwide prescription database and patient register . Norsk Epidemiologi, Supplement s. 95-95.
- Christian Lie Berg, Svetlana Skurtveit, Solveig Sakshaug, Vidar Hjellvik, Marte Handal, (2015). Reduced Prescribing of Benzodiazepines in Denmark and Norway. Basic & Clinical Pharmacology & Toxicology s. 457-458. doi: 10.1111/bcpt.12377
- Vidar Hjellvik, Marte Handal, Svetlana Skurtveit, Ingeborg Hartz, (2011). The relationship between unfavourable lifestyle in the ages 13-25 and subsequent use of potentially addictive prescription drugs in Norwegian men and women. Norsk Epidemiologi, Supplement s. 25-25.
- Vidar Hjellvik, Marte Handal, Svetlana Skurtveit, Ingeborg Hartz, (2011). The relationship between unfavourable lifestyle in the ages 13-25 and subsequent use of potentially addictive prescription drugs in Norwegian men and women.
- Vidar Hjellvik, Marte Handal, Svetlana Skurtveit, Ingeborg Hartz, (2011). The Relationship between Unfavourable Behaviour in the Ages 13-25 and Subsequent Use of Potentially Addictive Prescription Drugs in Norwegian Men and Women. Pharmacoepidemiology and Drug Safety s. S110-S111.
- Vidar Hjellvik, Randi Marie Selmer, Hege Salvesen Blix, Solveig Sakshaug, Aage Tverdal, (2009). Persistence of statin treatment by socioeconomic status. Pharmacoepidemiology and Drug Safety doi: 10.1002/pds
- Hege Salvesen Blix, Vidar Hjellvik, Irene Litleskare, Marit Rønning, Aage Tverdal, (2009). Is cigarette smoking a risk factor for subsequent use of antibiotics?. Pharmacoepidemiology and Drug Safety s. S98-S99. doi: 10.1002/pds.1806
- Vidar Hjellvik, Randi Marie Selmer, Hege Salvesen Blix, Solveig Sakshaug, Aage Tverdal, (2009). Persistence of antihypertensive therapy by socioeconomic status. Pharmacoepidemiology and Drug Safety s. S131-S132. doi: 10.1002/pds