Volkert Dirk Siersma
!!Statistiker, External Lecturer
Forskningsenheden for Almen Praksis
Øster Farimagsgade 5
1353 København K
Section of Biostatistics
Øster Farimagsgade 5 opg. B
1353 København K
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Conjunctival intraepithelial neoplasia and carcinoma: distinct clinical and histological features in relation to human papilloma virus status
Ramberg, Ingvild Margrethe Sellæg, Toft, Peter Bjerre, Georgsen, J. B., Siersma, Volkert Dirk, Funding, M., Jensen, D. H., von Buchwald, Christian & Heegaard, Steffen, 2021, In: British Journal of Ophthalmology. 105, 6, p. 878-883 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Decreasing incidence of foot ulcer among patients with type 1 and type 2 diabetes in the period 2001-2014
Rasmussen, A., Almdal, Thomas Peter, Nielsen, A. A., Nielsen, K. E., Jørgensen, M. E., Hangaard, S., Siersma, Volkert Dirk & Holstein, P. E., Aug 2017, In: Diabetes Research and Clinical Practice. 130, p. 221-228 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Omkostningsanalyse af sundhedsudgifter ved Danish Lung Cancer Screening Trial, DLCST - en registerundersøgelse
Rasmussen, J. F., Brodersen, John Brandt, Siersma, Volkert Dirk, Saghir, Z., Dirksen, A. & Pedersen, J. H., 2012, København: Ministeriet for Sundhed og Forebyggelse.Research output: Book/Report › Report › Research
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Healthcare costs in the Danish randomised controlled lung cancer CT-screening trial: A registry study
Rasmussen, J. F., Siersma, Volkert Dirk, Pedersen, J. H., Heleno, B., Saghir, Z. & Brodersen, John Brandt, Mar 2014, In: Lung Cancer. 83, 3, p. 347-355 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Psychosocial consequences of false positives in the Danish Lung Cancer CT Screening Trial: A nested matched cohort study
Rasmussen, J. F., Siersma, Volkert Dirk, Malmqvist, J. & Brodersen, John Brandt, 2020, In: BMJ Open. 10, 6, e034682.Research output: Contribution to journal › Journal article › Research › peer-review
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Does anaesthesia cause postoperative cognitive dysfunction? A randomised study of regional versus general anaesthesia in 438 elderly patients
Rasmussen, L. S., Johnson, T. D., Kuipers, H. M., Kristensen, D., Siersma, Volkert Dirk, Vila, P., Jolles, J., Papaioannaou, A., Abildstrøm, H., Silverstein, J. H., Bonal, J. A., Raeder, J., Nielsen, I. K., Korttila, K., Munoz, L., Dodds, C., Hanning, C. D. & Møller, J. T., 2003, In: Acta Anaesthesiologica Scandinavica. 47, p. 260-266Research output: Contribution to journal › Journal article › Research › peer-review
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Is peri-operative cortisol secretion related to post-operative cognitive dysfunction
Rasmussen, L. S., O'Brien, J. T., Silverstein, J. H., Johnson, T. W., Siersma, Volkert Dirk, Canet, J., Jolles, J., Hanning, C. D., Kuipers, H. M., Abildstrøm, H., Papaionnou, A., Raeder, J., Yli-Hankala, A., Sneyd, J. R., Munoz, L. & Møller, J. T., 2005, In: Acta Anaesthesiologica Scandinavica. 49, p. 1225-1231Research output: Contribution to journal › Journal article › Research › peer-review
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Postoperative cognitive dysfunction: true deterioration versus random variation
Rasmussen, L. S. & Siersma, Volkert Dirk, 2004, In: Acta Anaesthesiologica Scandinavica. 48, p. 1137-1143Research output: Contribution to journal › Journal article › Research › peer-review
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Follicular lymphoma of the ocular adnexal region: A nation-based study
Rasmussen, P. K., Ralfkiaer, E., Prause, J. U., Sjö, Lene Dissing, Specht, Lena, Rossing, H. H., Siersma, Volkert Dirk & Heegaard, Steffen, Mar 2015, In: Acta Ophthalmologica. 93, 2, p. 184-191 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Malignant lymphoma of the lacrimal gland: a nation-based study
Rasmussen, P. K., Ralfkiaer, E., Prause, J. U., Sjö, Lene Dissing, Siersma, Volkert Dirk & Heegaard, Steffen, 2011, In: Archives of Ophthalmology. 129, 10, p. 1275-80 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Diffuse large B-cell lymphoma of the ocular adnexal region: A nation-based study
Rasmussen, P. K., Ralfkiaer, E., Prause, J. U., Sjö, Lene Dissing, Toft, Peter Bjerre, Siersma, Volkert Dirk & Heegaard, Steffen, 2013, In: Acta Ophthalmologica. 91, p. 163-169 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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The SOFIA pilot trial: a cluster-randomized trial of coordinated, co-produced care to reduce mortality and improve quality of life in people with severe mental illness in the general practice setting
Rozing, Maarten Pieter, Jønsson, Alexandra Brandt Ryborg, Køster-Rasmussen, Rasmus, Due, Tina Drud, Brodersen, John Brandt, Bissenbakker, Kristine Henderson, Siersma, Volkert Dirk, Mercer, S. W., Guassora, Ann Dorrit, Kjellberg, J., Kjellberg, P. K., Nielsen, Maria Haahr, Christensen, I., Bardram, J. E., Martiny, Frederik Handberg Juul, Møller, Anne, Reventlow, Susanne & SOFIA Study Grp, S. S. G., 2021, In: Pilot and Feasibility Studies. 7, 1, 13 p., 168.Research output: Contribution to journal › Journal article › Research › peer-review
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Changes in HbA1cduring the first six years after the diagnosis of Type 2 diabetes mellitus predict long-term microvascular outcomes
Rozing, Maarten Pieter, Møller, Anne, Aabenhus, Rune Munck, Siersma, Volkert Dirk, Rasmussen, K. & Køster-Rasmussen, Rasmus, 2019, In: PLoS ONE. 14, 11, e0225230.Research output: Contribution to journal › Journal article › Research › peer-review
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Prehospital treatment of opioid overdose in Copenhagen--is it safe to discharge on-scene?
Rudolph, S. S., Jehu, G., Nielsen, S. L., Nielsen, K., Siersma, Volkert Dirk & Rasmussen, L. S., 2011, In: Resuscitation. 82, 11, p. 1414-1418 5 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Development of quality indicators for the diagnosis and treatment of urinary tract infections in general practice: a RAND appropriateness method
Saust, Laura Trolle, Siersma, Volkert Dirk, Bjerrum, Lars & Hansen, M. P., 2023, In: BMJ Open Quality. 12, 2, 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Diagnosis and Antibiotic Treatment of Urinary Tract Infections in Danish General Practice: A Quality Assessment
Saust, Laura Trolle, Siersma, Volkert Dirk, Lykkegaard, J., Bjerrum, Lars & Hansen, M. P., 2022, In: Antibiotics. 11, 12, 10 p., 1759.Research output: Contribution to journal › Journal article › Research › peer-review
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Quality assessment in general practice: diagnosis and antibiotic treatment of acute respiratory tract infections
Saust, Laura Trolle, Bjerrum, Lars, Siersma, Volkert Dirk, Arpi, M. & Hansen, M. P., 2018, In: Scandinavian Journal of Primary Health Care. 36, 4, p. 372-379 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Quantitative Electroencephalography Analyzed by Statistical Pattern Recognition as a Diagnostic and Prognostic Tool in Mild Cognitive Impairment: Results from a Nordic Multicenter Cohort Study
Schjønning Nielsen, M., Simonsen, A. H., Siersma, Volkert Dirk, Engedal, K., Jelic, V., Andersen, B. B., Naik, M., Hasselbalch, Steen & Høgh, Peter, 2018, In: Dementia and Geriatric Cognitive Disorders. Extra. 8, 3, p. 426-438 13 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Evaluation of the Danish version of the prenatal parental reflective functioning questionnaire in early pregnancy as a screening tool
Schwartz, M., Rasmussen, Ida Scheel, Wilson, Philip Michael John, Overbeck, Gritt & Siersma, Volkert Dirk, 2023, In: Infant Mental Health Journal. 44, 3, 19 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Monte Carlo and bootstrap evaluation of model search in graphical models for ordinal data
Siersma, Volkert Dirk & Kreiner, Svend, 2010.Research output: Contribution to conference › Conference abstract for conference › Research
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Monte Carlo Evaluation of Model Search in Graphical Models for Ordinal Data
Siersma, Volkert Dirk & Kreiner, Svend, 2008, Heidelberg: Physica-Verlag.Research output: Book/Report › Report › Research
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Health-Related Quality of Life Predicts Major Amputation and Death, but Not Healing, in People With Diabetes Presenting With Foot Ulcers: The Eurodiale Study
Siersma, Volkert Dirk, Thorsen, Hanne, Holstein, P. E., Kars, M., Apelqvist, J., Jude, E. B., Piaggesi, A., Bakker, K., Edmonds, M., Jirkovska, A., Mauricio, D., Ragnarson Tennvall, G., Reike, H., Spraul, M., Uccioli, L., Urbancic, V., Acker, K., Baal, K. & Schaper, N. C., Mar 2014, In: Diabetes Care. 37, 3, p. 694-700 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Simulating from graphical models for ordinal categorical data
Siersma, Volkert Dirk & Kreiner, Svend, 2007, Museum Tusculanum.Research output: Book/Report › Report › Research
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A coefficient of association between categorical variables with partial or tentative ordering of categories
Siersma, Volkert Dirk & Kreiner, Svend, 2007, Juli, 2007 [Biostatistisk Afdeling rapport 07-10] ed. Museum Tusculanum.Research output: Book/Report › Report › Research
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Studies in the interaction between disease development and interventions
Siersma, Volkert Dirk, 2008, In: Maanedsskrift for Praktisk Laegegerning. p. -Research output: Contribution to journal › Journal article › Research › peer-review
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Importance Sampling Strategies for Off-Policy LSTD(1)
Siersma, Volkert Dirk, 2009, København: Museum Tusculanum. (Research Report, Biostatistisk Afdeling, Institut for Folkesundhedsvidenskab.; No. 9/12).Research output: Book/Report › Report › Research
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Diabetic complications do not hamper improvement of health-related quality of life over the course of treatment of diabetic foot ulcers: the Eurodiale study
Siersma, Volkert Dirk, Thorsen, Hanne, Holstein, P. E., Kars, M., Apelqvist, J., Jude, E. B., Piaggesi, A., Bakker, K., Edmonds, M., Jirkovská, A., Mauricio, D., Reike, H., Spraul, M., Uccioli, L., Urbancic, V., van Acker, K., van Baal, J. & Schaper, N. C., Jul 2017, In: Journal of Diabetes and its Complications. 31, 7, p. 1145-1151 7 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Visual impairment and mortality in patients with type 2 diabetes
Siersma, Volkert Dirk, Køster-Rasmussen, Rasmus, Bruun, C., Olivarius, Niels de Fine & Brunes, A., 2019, In: B M J Open Diabetes Research & Care. 7, 1, 9 p., e000638.Research output: Contribution to journal › Journal article › Research › peer-review
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A Coefficient of Association Between Categorical Variables With Partial or Tentative Ordering of Categories
Siersma, Volkert Dirk & Kreiner, Svend, 2009, In: Sociological Methods & Research. 38, 2, p. 265-286 21 p.Research output: Contribution to journal › Journal article › Research › peer-review
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The effectiveness of computer reminders versus postal reminders for improving quality assessment for point-of-care testing in primary care: a randomized controlled trial
Siersma, Volkert Dirk, Kousgaard, Marius Brostrøm, Reventlow, Susanne, Ertmann, Ruth Kirk, Felding, P. & Waldorff, Frans Boch, Feb 2015, In: Journal of Evaluation in Clinical Practice. 21, 1, p. 13-20 8 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Studies in the interactions between disease development and interventions
Siersma, Volkert Dirk, 2008, Museum Tusculanum.Research output: Book/Report › Ph.D. thesis › Research
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Analysis with repeatedly measured binary item response data by ad hoc Rasch scales
Siersma, Volkert Dirk & Eusebi, P., 2013, Rasch Models in Health. Christensen, K. B., Kreiner, S. & Mesbah, M. (eds.). Wiley, p. 257-275 18 p. (Wiley-ISTE, London).Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research
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The importance of factors determining the low health-related quality of life in people presenting with a diabetic foot ulcer – the Eurodiale study.
Siersma, Volkert Dirk, Thorsen, H., Holstein, P., Kars, M., Apelqvist, J., Jude, E., Piagessi, A., Bakker, K., Edmonds, M., Jirkovska, A., Mauricio, D., Tennvall, G., Reike, H., Spraul, M., Uccioli, L., Urbancic, V., Acker, K., Baal, J. & Schaper, N., 2013, In: Diabetic Medicine. 30, 11, p. 1382-1387Research output: Contribution to journal › Journal article › Research › peer-review
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Multivariable modelling for meta-epidemiological assessment of the association between trial quality and treatment effects estimated in randomized clinical trials
Siersma, Volkert Dirk, Als-Nielsen, B., Chen, W., Hilden, Jørgen, Gluud, L. L. & Gluud, C. N., 2007, In: Statistics in Medicine. 26, 14, p. 2745-2758 13 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Subjective memory complaints in primary care patients and death from all causes: a four-year follow-up
Siersma, Volkert Dirk, Waldemar, Gunhild & Waldorff, Frans Boch, Mar 2013, In: Scandinavian Journal of Primary Health Care. 31, 1, p. 7-12Research output: Contribution to journal › Journal article › Research › peer-review
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Chronic hyperglycemia, hypercholesterolemia, and metabolic syndrome are associated with risk of tendon injury
Skovgaard, D., Siersma, Volkert Dirk, Klausen, S. B., Visnes, H., Haukenes, I., Bang, C. W., Bager, P., Gravare Silbernagel, K., Gaida, J., Magnusson, Stig Peter, Kjær, Michael & Couppé, Christian, 2021, In: Scandinavian Journal of Medicine & Science in Sports. 31, 9, p. 1822-1831 11 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Change in Fitness and the Relation to Change in Cognition and Neuropsychiatric Symptoms After Aerobic Exercise in Patients with Mild Alzheimer's Disease
Sobol, N. A., Dall, C. H., Høgh, Peter, Hoffmann, K., Frederiksen, K. S., Vogel, A., Siersma, Volkert Dirk, Waldemar, Gunhild, Hasselbalch, Steen & Beyer, N., 2018, In: Journal of Alzheimer's Disease. 65, 1, p. 137-145 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Effect of aerobic exercise on physical performance in patients with Alzheimer’s disease
Sobol, N. A., Hoffmann, K., Frederiksen, K. S., Vogel, A., Vestergaard, K., Brændgaard, H., Gottrup, H., Lolk, A., Wermuth, L., Jakobsen, S., Laugesen, L., Gergelyffy, R., Høgh, P., Bjerregaard, E., Siersma, Volkert Dirk, Andersen, B. B., Johannsen, P., Waldemar, G., Hasselbalch, S. G. & Beyer, N., 2016, In: Alzheimer's & Dementia. 12, 12, p. 1207–1215 9 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Psychosocial consequences among women with false-positive results after mammography screening in Norway
Solbjør, M., Forsmo, S., Skolbekken, J., Siersma, Volkert Dirk & Brodersen, John Brandt, 2018, In: Scandinavian Journal of Primary Health Care. 36, 4, p. 380-389 10 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Neurosurgical Admission Later Than 4 h After the Emergency Call Does Not Result in Worse Long-Term Outcome in Subarachnoid Haemorrhage
Sonne, A., Andersen, J. B., Eskesen, V., Lippert, F., Waldorff, Frans Boch, Siersma, Volkert Dirk, Lohse, Nicolai Rasch & Rasmussen, L. S., 2021, In: Frontiers in Neurology. 12Research output: Contribution to journal › Journal article › Research › peer-review
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Criteria-based dispatch of emergency medical services in non-traumatic subarachnoid haemorrhage
Sonne, A., Andersen, Jesper, Eskesen, V., Lippert, F., Waldorff, Frans Boch, Bang, C. W., Siersma, Volkert Dirk, Lohse, Nicolai Rasch & Rasmussen, L. S., 2021, In: Danish Medical Journal. 68, 9, 9 p., 02210152.Research output: Contribution to journal › Journal article › Research › peer-review
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Is postoperative cognitive dysfunction a risk factor for dementia?
Steinmetz, Jacob, Siersma, Volkert Dirk, Kessing, Lars Vedel, Rasmussen, L. S. & Group, T. I., 2013, In: British Journal of Anaesthesia. 110 Suppl, 1, p. i92-i97 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Mental healthcare utilisation among Danish formerly deployed military personnel and their civilian counterparts: a cohort study
Stoltenberg, Christian Ditlev G, Vedtofte, M. S., Nielsen, Anni Brit Sternhagen, Andersen, S. B., Siersma, Volkert Dirk, Christensen, K. S. & Osler, Merete, 2024, In: European Journal of Psychotraumatology. 15, 1, 12 p., 2296188.Research output: Contribution to journal › Journal article › Research › peer-review
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Incidence of new-onset type 2 diabetes after cancer: A Danish cohort study
Sylow, Lykke, Grand, Mia Klinten, von Heymann, A., Persson, F., Siersma, Volkert Dirk, Kriegbaum, Margit, Andersen, Christen Bertel L & Johansen, Christoffer, 2022, In: Diabetes Care. 45, 6, p. e105-e106 2 p.Research output: Contribution to journal › Letter › Research › peer-review
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Spending time outside to reduce infections at preschool may be an overrated strategy
Söderström, M., Siersma, Volkert Dirk & Boldemann, C., 2018, In: Acta Paediatrica. 107, 9, p. 1652 1 p.Research output: Contribution to journal › Editorial › Research › peer-review
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A cross-sectional study of the association between family conflicts and children's health: Lolland-Falster Health Study
Søndergaard, Elisabeth, Reventlow, Susanne, Siersma, Volkert Dirk, Nicolaisdottir, Dagny Ros, Jepsen, R., Rasmussen, K. & Møller, Anne, 2023, In: Child: Care, Health and Development. 49, 6, p. 972-984 13 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Uptake of signposting to web-based resources: pregnant women’s use of a preventive web-based intervention
Sørensen, E. R., Rasmussen, Ida Scheel, Overbeck, Gritt, Siersma, Volkert Dirk, Appel, Clara Lundmark & Wilson, Philip Michael John, 2023, In: BMC Primary Care. 24, 11 p., 189.Research output: Contribution to journal › Journal article › Research › peer-review
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Effects of Diagnostic Work-Up on Medical Decision-Making for Canine Urinary Tract Infection: An Observational Study in Danish Small Animal Practices
Sørensen, Tina Møller, Bjørnvad, Charlotte Reinhard, Cordoba Currea, Gloria Cristina, Damborg, Peter Panduro, Guardabassi, Luca, Siersma, Volkert Dirk, Bjerrum, Lars & Jessen, Lisbeth Rem, 2018, In: Journal of Veterinary Internal Medicine. 32, 2, p. 743-751Research output: Contribution to journal › Journal article › Research › peer-review
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Pre-test probability of urinary tract infection in dogs with clinical signs of lower urinary tract disease
Sørensen, Tina Møller, Holmslykke, M., Nordlund, M., Siersma, Volkert Dirk & Jessen, Lisbeth Rem, 2019, In: Veterinary Journal. 247, p. 65-70 6 p.Research output: Contribution to journal › Journal article › Research › peer-review
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Hunde med tegn på cystitis overbehandles
Sørensen, Tina Møller, Bjørnvad, Charlotte Reinhard, Cordoba Currea, Gloria Cristina, Damborg, Peter Panduro, Guardabassi, Luca, Siersma, Volkert Dirk, Bjerrum, Lars & Jessen, Lisbeth Rem, Jun 2018, In: Dyrlægen; fagmagasin for dyrlæger, veterinærstuderende og veterinærsygeplejersker. 12, 3, p. 22-26 5 p.Research output: Contribution to journal › Journal article › Communication
ID: 3512987
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Maternal stress and placental function, a study using questionnaires and biomarkers at birth
Research output: Contribution to journal › Journal article › Research › peer-review
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Clinical indications for antibiotic use in Danish general practice: results from a nationwide electronic prescription database
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Biomonitoring of Danish school children and mothers including biomarkers of PBDE and glyphosate
Research output: Contribution to journal › Journal article › Research › peer-review
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