Volkert Dirk Siersma

Volkert Dirk Siersma

!!Statistiker, External Lecturer

ORCID: 0000-0003-1941-2681

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  1. Published

    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

  2. Published

    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

  3. Published

    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

  4. Published

    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

  5. Published

    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

  6. Published

    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. 260-266

    Research output: Contribution to journal › Journal article › Research › peer-review

  7. Published

    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. 1225-1231

    Research output: Contribution to journal › Journal article › Research › peer-review

  8. Published

    Postoperative cognitive dysfunction: true deterioration versus random variation

    Rasmussen, L. S. & Siersma, Volkert Dirk, 2004, In: Acta Anaesthesiologica Scandinavica. 48, p. 1137-1143

    Research output: Contribution to journal › Journal article › Research › peer-review

  9. Published

    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

  10. Published

    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

  11. Published

    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

  12. Published

    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

  13. Published

    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

  14. Published

    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

  15. Published

    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

  16. Published

    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

  17. Published

    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

  18. Published

    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

  19. Published

    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

  20. Published

    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

  21. Published

    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

  22. Published

    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

  23. Published

    Simulating from graphical models for ordinal categorical data

    Siersma, Volkert Dirk & Kreiner, Svend, 2007, Museum Tusculanum.

    Research output: Book/Report › Report › Research

  24. Published

    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

  25. Published

    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

  26. Published

    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

  27. Published

    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

  28. Published

    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

  29. Published

    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

  30. Published

    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

  31. Published

    Studies in the interactions between disease development and interventions

    Siersma, Volkert Dirk, 2008, Museum Tusculanum.

    Research output: Book/Report › Ph.D. thesis › Research

  32. Published

    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

  33. Published

    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. 1382-1387

    Research output: Contribution to journal › Journal article › Research › peer-review

  34. Published

    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

  35. Published

    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. 7-12

    Research output: Contribution to journal › Journal article › Research › peer-review

  36. Published

    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

  37. Published

    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

  38. Published

    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

  39. Published

    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

  40. Published

    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. 12

    Research output: Contribution to journal › Journal article › Research › peer-review

  41. Published

    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

  42. Published

    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

  43. Published

    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

  44. Published

    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

  45. Published

    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

  46. Published

    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

  47. Published

    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

  48. Published

    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. 743-751

    Research output: Contribution to journal › Journal article › Research › peer-review

  49. Published

    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

  50. Published

    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

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ID: 3512987