Volkert Dirk Siersma

Volkert Dirk Siersma

!!Statistiker, External Lecturer

ORCID: 0000-0003-1941-2681

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  1. Published

    Depression and anxiety symptoms in pregnant women in Denmark during COVID-19

    Overbeck, Gritt, Andersen, Julie Høgsgaard, mxb897, mxb897, Rasmussen, Ida Scheel, Kragstrup, Jakob, Siersma, Volkert Dirk, Wilson, Philip Michael John & Ertmann, Ruth Kirk, 2021, In: Scandinavian Journal of Public Health. 49, 7, p. 721-729 9 p.

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

  2. Published

    Changes in levels of haemoglobin A1c during the first 6 years after diagnosis of clinical type 2 diabetes

    Olivarius, Niels de Fine, Siersma, Volkert Dirk, Hansen, Lars J, Drivsholm, Thomas & Horder, M., 2009, In: Scandinavian Journal of Clinical & Laboratory Investigation. 69, 8, p. 851-857 7 p.

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

  3. Published

    Peripheral vascular disease is associated with reduced glycosuria in newly diagnosed type 2 diabetic patients.

    Olivarius, Niels de Fine, von Holstein-Rathlou, Niels-Henrik, Siersma, Volkert Dirk, Witt, K., Vestbo, E., Andreasen, A. H. & Mogensen, C. E., 2004, In: Diabetes & Metabolism. 30, 3, p. 269-74 5 p.

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

  4. Published

    Prevalence and progression of visual impairment in patients newly diagnosed with clinical type 2 diabetes: a 6-year follow up study

    Olivarius, Niels de Fine, Siersma, Volkert Dirk, Almind, G. J. & Nielsen, N. V., 2011, In: B M C Public Health. 11, 80

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

  5. Published

    Vaegtanamnesen for patienter med nyopdaget type 2-diabetes--sekundaerpublikation

    Olivarius, Niels de Fine, Richelsen, B., Siersma, Volkert Dirk, Andreasen, A. H. & Beck-Nielsen, H., 2008, In: Ugeskrift for læger. 170, 45, p. 3640-3 3 p.

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

  6. Published

    Weight Changes following the Diagnosis of Type 2 Diabetes: The Impact of Recent and Past Weight History before Diagnosis. Results from the Danish Diabetes Care in General Practice (DCGP) Study

    Olivarius, Niels de Fine, Siersma, Volkert Dirk, Køster-Rasmussen, Rasmus, Heitmann, Berit & Waldorff, Frans Boch, 15 Apr 2015, In: P L o S One. 10, 4, p. 1-14 14 p., e0122219.

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

  7. Published

    Changes in patient weight and the impact of antidiabetic therapy during the first 5 years after diagnosis of diabetes mellitus

    Olivarius, Niels de Fine, Andreasen, A. H., Siersma, Volkert Dirk, Richelsen, B. & Beck-Nielsen, H., 2006, In: Diabetologia. 49, 9, p. 2058-2067 9 p.

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

  8. Published

    Weight change og change in weight trend. Differences in analytical approaches

    Olivarius, Niels de Fine & Siersma, Volkert Dirk, 2007, In: Diabetes, Obesity and Metabolism. 9, p. 915-916 1 p.

    Research output: Contribution to journal › Letter › Research › peer-review

  9. Published

    Vægtforløbet og betydningen af antidiabetisk behandling de første fem år efter diabetesdiagnosen - sekundærpublikation

    Olivarius, Niels de Fine, Andreasen, A. H., Siersma, Volkert Dirk, Richelsen, B. & Beck-Nielsen, H., 2006, In: Ugeskrift for læger. 168/45, p. 3913-3916

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

  10. Published

    Predictors of mortality of patients newly diagnosed with clinical type 2 diabetes: a 5-year follow up study

    Olivarius, Niels de Fine, Siersma, Volkert Dirk, Nielsen, Anni Brit Sternhagen, Hansen, L. J., Rosenvinge, L. & Mogensen, C. E., 1 Jan 2010, In: B M C Endocrine Disorders. 10, p. 14

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

  11. Published

    Patients newly diagnosed with clinical type 2 diabetes during oral glucocorticoid treatment and observed for 14 years: all-cause mortality and clinical developments

    Olivarius, Niels de Fine, Siersma, Volkert Dirk, Dyring-Andersen, B., Drivsholm, Thomas, Hansen, Lars J & Henriksen, J. E., Apr 2011, In: Basic & Clinical Pharmacology & Toxicology. 108, 4, p. 285-288 4 p.

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

  12. Published

    The Astonishing Hypothesis (Letter)

    Olivarius, Niels de Fine & Siersma, Volkert Dirk, 2012, In: Primary Care Diabetes.

    Research output: Contribution to journal › Letter › Research

  13. Published

    Weight history of patients with newly diagnosed Type 2 diabetes

    Olivarius, N. D. F., Richelsen, B., Siersma, Volkert Dirk, Andreasen, A. H. & Beck-Nielsen, H., 2008, In: Diabetic Medicine. 25, 8, p. 933-41 8 p.

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

  14. Published

    Distinguishing fluvio-deltaic facies by bulk geochemistry and heavy minerals: an example from the Miocene of Denmark

    Olivarius, M., Rasmussen, E. S., Siersma, Volkert Dirk, Knudsen, C. & Pedersen, G. K., 2011, In: Sedimentology. 58, 5, p. 1155-1179 25 p.

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

  15. Published

    Mobility Decline in Old Age: The Joint Effect of Mobility-Related Fatigue and Social Relations.

    Nilsson, Charlotte Juul, Siersma, Volkert Dirk, Avlund, K., Vass, Mikkel & Lund, Rikke, 2013.

    Research output: Contribution to conference › Conference abstract for conference › Communication

  16. Published

    Progression of Mobility Limitations in Old Age: The Combined Effect of Mobility-Related Fatigue and Socio-Economic Position

    Nilsson, Charlotte Juul, Siersma, Volkert Dirk, Mänty, M. R., Lund, Rikke, Vass, Mikkel & Avlund, K., 2013.

    Research output: Contribution to conference › Conference abstract for conference › Research

  17. Published

    Mobility decline in old age: the combined effect of mobility-related fatigue and socioeconomic position

    Nilsson, Charlotte Juul, Siersma, Volkert Dirk, Mänty, M. R., Avlund, K., Vass, Mikkel & Lund, Rikke, 2014, In: Journal of Epidemiology & Community Health. 68, p. 510-515 6 p.

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

  18. Published

    Are CSF Biomarkers Useful as Prognostic Indicators in Diagnostically Unresolved Cognitively Impaired Patients in a Normal Clinical Setting

    Nielsen, M. S., Simonsen, A. H., Siersma, Volkert Dirk, Hasselbalch, Steen & Høgh, Peter, Sep 2016, In: Dementia and Geriatric Cognitive Disorders. Extra. 6, 3, p. 465-476 12 p.

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

  19. Published

    The Diagnostic and Prognostic Value of a Dual-Tasking Paradigm in a Memory Clinic

    Nielsen, M. S., Simonsen, A. H., Siersma, Volkert Dirk, Hasselbalch, Steen & Høgh, Peter, 2018, In: Journal of Alzheimer's Disease. 61, 3, p. 1189-1199 11 p.

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

  20. Published

    Treatment of opioid overdose in a physician-based prehospital EMS: Frequency and long-term prognosis

    Nielsen, K., Nielsen, S. L., Siersma, Volkert Dirk & Rasmussen, L. S., 2011, In: Resuscitation. 82, 11, p. 1410-1413 4 p.

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

  21. Published

    Respiratory syncytial virus infection - risk factors for hospital admission: a case-control study

    Nielsen, H. E., Siersma, Volkert Dirk, Andersen, S., Gahrn-Hansen, B., Mordhorst, C. H., Nørgaard-Pedersen, B., Røder, B., Sørensen, T. L., Temme, R. & Vestergaard, B. F., 2003, In: Acta Paediatr.. 92, p. 1314-1321

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

  22. Published

    Health-Related Quality of Life and Physical Function in Individuals with Parkinson's Disease after a Multidisciplinary Rehabilitation Regimen-A Prospective Cohort Feasibility Study

    Nielsen, C., Siersma, Volkert Dirk, Ghaziani, E., Beyer, N., Magnusson, Stig Peter & Couppé, Christian, Jan 2020, In: International Journal of Environmental Research and Public Health. 17, 20, 13 p., 7668.

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

  23. Published

    Poor self-rated health did not increase risk of permanent nursing placement or mortality in people with mild Alzheimer’s disease

    Nielsen, Anni Brit Sternhagen, Siersma, Volkert Dirk, Waldemar, Gunhild & Waldorff, Frans Boch, 2016, In: B M C Geriatrics. 16, 87

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

  24. Published

    The impact of changes in self-rated general health on 28-year mortality among middle-aged Danes

    Nielsen, Anni Brit Sternhagen, Siersma, Volkert Dirk, Kreiner, Svend, Hiort, L. C., Drivsholm, Thomas, Eplov, L. F. & Hollnagel, Hanne, 2009, In: Scandinavian Journal of Primary Health Care. 27, 3, p. 160-166 7 p.

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

  25. Published

    The relationship between HbA(1c) level, symptoms and self-rated health in type 2 diabetic patients

    Nielsen, Anni Brit Sternhagen, Gannik, D. E., Siersma, Volkert Dirk & Olivarius, Niels de Fine, Sep 2011, In: Scandinavian Journal of Primary Health Care. 29, 3, p. 157-164 8 p.

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

  26. Published

    The predictive value of self-rated health in the presence of subjective memory complaints on permanent nursing home placement in elderly primary care patients over 4-year follow-up.

    Nielsen, Anni Brit Sternhagen, Siersma, Volkert Dirk, Waldemar, Gunhild & Waldorff, Frans Boch, 2013, In: Age and Ageing. 43, 1, p. 50-57

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

  27. Published

    Self-rated general health among 40-year-old Danes and its association with all-cause mortality at 10-, 20-, and 29 years' follow-up

    Nielsen, Anni Brit Sternhagen, Siersma, Volkert Dirk, Hiort, L. C., Drivsholm, T., Kreiner, Svend & Hollnagel, Hanne, 2008, In: Scandinavian Journal of Public Health. 170, 36, p. 3-11 8 p.

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

  28. Published

    Randomised controlled trial of extraarticular gold bead implantation for treatment of knee osteoarthritis: a pilot study

    Nejrup, K., Olivarius, Niels de Fine, Jacobsen, J. L. & Siersma, Volkert Dirk, Nov 2008, In: Clinical Rheumatology. 27, 11, p. 1363-9 6 p.

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

  29. Published

    Symptom-based screening tool for asthma syndrome among young children in Uganda

    Nantanda, R., Siersma, Volkert Dirk, Ndeezi, G., Tumwine, J. K. & Ostergaard, M. S., 2020, In: Primary Care Respiratory Journal. 30, 6 p., 30.

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

  30. Published

    Developing a prediction model to identify people with severe mental illness without regular contact to their GP - a study based on data from the Danish national registers

    Naesager, A. H. D., Damgaard, S. N., Rozing, Maarten Pieter, Siersma, Volkert Dirk, Møller, Anne & Jensen, Katrine Tranberg, 2024, In: BMC Psychiatry. 24, 1, 12 p., 301.

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

  31. Published

    Micronucleus frequency in Danish school children and their mothers from the DEMOCOPHES population.

    Mørck, T. A., Vande Loock, K., Poulsen, M. B., Siersma, Volkert Dirk, Nielsen, J. K. S., Hertel, O., Kirsch-Volders, M. & Knudsen, Lisbeth E., 2016, In: Mutagenesis. 31, 1, p. 1-8 8 p.

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

  32. Published

    PFAS concentrations in plasma samples from Danish school children and their mothers

    Mørck, T. A., Nielsen, F., Nielsen, J. K. S., Siersma, Volkert Dirk, Grandjean, P. & Knudsen, Lisbeth E., 2015, In: Chemosphere. 129, p. 203-209 7 p.

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

  33. Published

    The Danish contribution to the European DEMOCOPHES project: A description of cadmium, cotinine and mercury levels in Danish mother-child pairs and the perspectives of supplementary sampling and measurements

    Mørck, T. A., Nielsen, F., Nielsen, J. K. S., Jensen, J. F., Hansen, P. W., Hansen, A. K., Christoffersen, L. A. N., Siersma, V. D., Larsen, I. H., Hohlmann, L. K., Skaanild, M. T., Frederiksen, H., Biot, P., Casteleyn, L., Kolossa-Gehring, M., Schwedler, G., Castaño, A., Angerer, J., Koch, H. M., Esteban, M. & 12 others, Schoeters, G., Den Hond, E., Exley, K., Sepai, O., Bloemen, L., Joas, R., Joas, A., Fiddicke, U., Lopez, A., Cañas, A., Aerts, D. & Knudsen, Lisbeth E., Aug 2015, In: Environmental Research. 141, p. 96-105 10 p.

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

  34. Published

    PCB Concentrations and Dioxin-like Activity in Blood Samples from Danish School Children and Their Mothers living in Urban and Rural Areas

    Mørck, T. A., Erdmann, S. E., Long, M., Mathiesen, Line, Nielsen, F., Siersma, Volkert Dirk, Bonefeld-Jørgensen, E. C. & Knudsen, Lisbeth E., Jul 2014, In: Basic & Clinical Pharmacology & Toxicology. 115, 1, p. 134-44 11 p.

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

  35. Published

    Allogeneic mesenchymal stem cell therapy for dry eye disease in patients with Sjögren's syndrome: A randomized clinical trial

    Møller-Hansen, M., Larsen, A. C., Wiencke, Anne Katrine Riise, Terslev, Lene, Siersma, Volkert Dirk, Andersen, T. T., Hansen, Adam Espe, Bruunsgaard, Helle, Haack-Sørensen, M., Ekblond, A., Kastrup, J., Utheim, T. P. & Heegaard, Steffen, 2024, In: Ocular Surface. 31, p. 1-8 8 p.

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

  36. Published

    Does physical exposure throughout working life influence chair-rise performance in midlife? A retrospective cohort study of associations between work and physical function in Denmark

    Møller, Anne, Reventlow, Susanne, Hansen, Åse Marie, Andersen, L. L., Siersma, Volkert Dirk, Lund, Rikke, Avlund, K., Andersen, J. H. & Mortensen, Ole Steen, 4 Nov 2015, In: B M J Open. 5, 11, p. 1-9 9 p., e009873.

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

  37. Published

    Cumulative physical workload and mobility limitations in middle-aged men and women: a population-based study with retrospective assessment of workload

    Møller, Anne, Mänty, M., Andersen, L. L., Siersma, Volkert Dirk, Lund, Rikke & Mortensen, Ole Steen, 2019, In: International Archives of Occupational and Environmental Health. 92, 5, p. 651-660 10 p.

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

  38. Published

    Does a history of physical exposures at work affect hand-grip strength in midlife? A retrospective cohort study in Denmark

    Møller, Anne, Reventlow, Susanne, Hansen, Åse Marie, Andersen, L. L., Siersma, Volkert Dirk, Lund, Rikke, Avlund, K., Andersen, J. H. & Mortensen, O. S., 10 May 2013, In: Scandinavian Journal of Work, Environment & Health. 39, 6, p. 599-608

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

  39. Published

    Influence of educational level on test and treatment for incident hypothyroidism

    Møllehave, Line Tang, Jacobsen, R. K., Linneberg, Allan René, Skaaby, T., Knudsen, Nils Jakob, Jørgensen, T., Kårhus, L. L., Kriegbaum, Margit, Grand, Mia Klinten, Siersma, Volkert Dirk, Lind, B., Andersen, Christen Bertel L, Nygaard, Birte, Medici, B. B., Pedersen, I. B., Ravn-Haren, G. & Thuesen, B. H., 2021, In: Clinical Endocrinology. 94, 6, p. 1025-1034 10 p.

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

  40. Published

    Social relations and contact with general practitioner in a middle-aged Danish population: a prospective register- and survey-based cohort study

    Mikkelsen, A. S. B., Lund, Rikke, Siersma, Volkert Dirk, Jørgensen, Terese Sara Høj, Christensen, Ulla & Kristiansen, Maria, 2022, In: BMC Health Services Research. 22, 481, 481.

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

  41. Published

    Risk of new or recurrent cancer after a high perioperative inspiratory oxygen fraction during abdominal surgery

    Meyhoff, C. S., Jørgensen, Lars Nannestad, Wetterslev, J., Siersma, Volkert Dirk & Rasmussen, L. S., 2014, In: British Journal of Anaesthesia. 113, suppl. 1, p. i74-i81 8 p.

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

  42. Published

    Endo- and exocytic rate constants for spontaneous and protein kinase C-activated T cell receptor cycling

    Bonefeld, Charlotte Menne, Møller Sørensen, T., Siersma, Volkert Dirk, von Essen, Marina Rode, Ødum, Niels & Geisler, Carsten, 2002, In: European Journal of Immunology. 32, 3, p. 616-26 10 p.

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

  43. Published

    Changes in Prescription Routines for Treating Hypothyroidism Between 2001 and 2015: An Observational Study of 929,684 Primary Care Patients in Copenhagen

    Medici, B. B., Nygaard, Birte, la Cour, J. L., Grand, Mia Klinten, Siersma, Volkert Dirk, Nicolaisdottir, Dagny Ros, Lind, B., Olivarius, Niels de Fine & Andersen, Christen Bertel L, 2019, In: Thyroid. 29, 7, p. 910-919

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

  44. Published

    Deaths and cardiopulmonary events following colorectal cancer screening—A systematic review with meta-analyses

    Martiny, Frederik Handberg Juul, Bie, A. K. L., Jauernik, Christian Patrick, Rahbek, O. J., Nielsen, S. B., Gram, Emma Grundtvig, Kindt, I. S., Siersma, Volkert Dirk & Brodersen, John Brandt, 2024, In: PLoS ONE. 19, 3, 23 p., e0295900.

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

  45. Published

    Informasjonsstyrke og utvalgsstørrelse i kvalitative studier

    Malterud, Kirsti, Siersma, Volkert Dirk & Guassora, Ann Dorrit, 2016, In: Fysioterapeuten. 83, 8, p. 31 1 p.

    Research output: Contribution to journal › Journal article › Research

  46. Published

    Sample size in qualitative interview studies: guided by information power

    Malterud, Kirsti, Siersma, Volkert Dirk & Guassora, Ann Dorrit, Nov 2016, In: Qualitative Health Research. 26, 13, p. 1753-1760 8 p.

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

  47. Published

    Did psychosocial status, sociodemographics and smoking status affect non-attendance in control participants in the Danish Lung Cancer Screening Trial? A nested observational study

    Malmqvist, J., Siersma, Volkert Dirk, Thorsen, Hanne, Heleno, B., Rasmussen, J. F. & Brodersen, John Brandt, 2020, In: BMJ Open. 10, 2, 8 p.

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

  48. Published

    Short and long-term psychosocial consequences of participating in a colorectal cancer screening programme: a matched longitudinal study

    Malmqvist, J., Siersma, Volkert Dirk, Hestbech, Mie Sara, Bang, C. W., Nicolaisdottir, Dagny Ros & Brodersen, John Brandt, 2022, In: BMJ Evidence-Based Medicine. 27, 2, 10 p.

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

  49. Published

    Consequences of screening in colorectal cancer (COS-CRC): development and dimensionality of a questionnaire

    Malmqvist, J., Siersma, Volkert Dirk, Bang, C. W. & Brodersen, John Brandt, Dec 2021, In: BMC Psychology. 9, 1, 16 p., 7.

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

  50. Published

    Psychosocial consequences of invitation to colorectal cancer screening: A matched cohort study

    Malmqvist, J., Siersma, Volkert Dirk, Hestbech, Mie Sara, Nicolaisdottir, Dagny Ros, Bang, C. W. & Brodersen, John Brandt, 2021, In: Journal of Epidemiology and Community Health. 75, 9, 7 p.

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

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ID: 3512987