Volkert Dirk Siersma

Volkert Dirk Siersma

!!Statistiker, External Lecturer

ORCID: 0000-0003-1941-2681

Publication year:
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151 - 200 out of 380Page size: 50
  1. 2016
  2. 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

  3. 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

  4. Published

    Moderate-to-high intensity physical exercise in patients with Alzheimer’s disease: a randomised controlled trial.

    Hoffmann, K., Sobol, N. A., Frederiksen, K. S., Beyer, N. A-M., Vogel, A. M., Vestergaard, K., Brændgaard, H., Gottrup, H., Lolk, A., Wermuth, L., Jacobsen, S., Laugesen, L. P., Gergelyffy, R. G., Høgh, P., Bjerregaard, E., Andersen, B. B., Siersma, V. D., Johannsen, P., Cotman, C. W., Waldemar, G. & 1 others, Hasselbalch, Steen, 2016, In: Journal of Alzheimer's Disease. 50, 2, p. 443-453 11 p.

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

  5. Published

    OP0006-HPR Even in The Long Run Nordic Walking Is Superior To Strength Training and Home Based Exercise for Improving Physical Function in Older People with Hip Osteoarthritis - An RCT

    Bieler, T., Siersma, Volkert Dirk, Magnusson, Stig Peter, Kjær, M. & Beyer, N., 2016, In: Annals of the Rheumatic Diseases. 75, p. 55 1 p.

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

  6. 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

  7. Published

    Prevalence and clinical significance of neutropenia discovered in routine complete blood cell counts: a longitudinal study

    Andersen, Christen Bertel L, Tesfa, D., Siersma, Volkert Dirk, Sandholdt, H., Hasselbalch, H., Bjerrum, O. W., Felding, P., Lind, B., Olivarius, Niels de Fine & Palmblad, J., 2016, In: Journal of Internal Medicine. 279, 6, p. 566-575

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

  8. Published

    The Potential of The Copenhagen Primary Care Laboratory (CopLab) Database

    Andersen, Christen Bertel L, Siersma, Volkert Dirk & Olivarius, Niels de Fine, 2016.

    Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  9. Published

    The excess mortality of patients with diabetes and concurrent psychiatric illness is markedly reduced by structured personal diabetes care. A 19-year follow up of the randomized controlled study Diabetes Care in General Practice (DCGP).

    Larsen, J. R., Siersma, Volkert Dirk, Davidsen, Annette Sofie, Waldorff, Frans Boch, Reventlow, Susanne & Olivarius, Niels de Fine, 2016, In: General Hospital Psychiatry. 38, p. 42-52 11 p.

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

  10. Published

    Long-term follow-up of trauma patients before and after implementation of a Physician-Staffed Helicopter: a prospective observational study

    Funder, K. S., Rasmussen, L. S., Lohse, N., Siersma, Volkert Dirk, Hesselfeldt, R. & Steinmetz, Jacob, Jan 2016, In: Injury. 47, 1, p. 7-13 7 p.

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

  11. Published

    Intentional Weight Loss and Longevity in Overweight Patients with Type 2 Diabetes: A Population-Based Cohort Study

    Køster-Rasmussen, Rasmus, Simonsen, M. K., Siersma, Volkert Dirk, Henriksen, J. E., Heitmann, Berit & Olivarius, Niels de Fine, 25 Jan 2016, In: PloS one. 11, 1, p. 1-14 14 p., e0146889.

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

  12. Published

    Associations between plasma concentrations of PCB 28 and possible indoor exposure sources in Danish school children and mothers

    Egsmose, E. L., Bräuner, E. V., Frederiksen, M., Mørck, T. A., Siersma, Volkert Dirk, Hansen, P. W., Nielsen, F., Grandjean, P. & Knudsen, Lisbeth E., Feb 2016, In: Environment International. 87, p. 13-19 7 p.

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

  13. Published

    Maternal pain influences her evaluation of recurrent pain in 6- to 11-year-old healthy children

    mxb897, mxb897, Siersma, Volkert Dirk, Nielsen, Kirsten Lykke, Ertmann, Ruth Kirk, Knudsen, Lisbeth E. & Mäkelä, Marjukka, Feb 2016, In: Acta Paediatrica. 105, 2, p. 183-190 8 p.

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

  14. Published

    The impact of gender on the long-term morbidity and mortality of patients with type 2 diabetes receiving structured personal care: A 13-year follow-up study

    Krag, M. Ø., Hasselbalch, L., Siersma, Volkert Dirk, Nielsen, Anni Brit Sternhagen, Reventlow, Susanne, Malterud, Kirsti & Olivarius, Niels de Fine, Feb 2016, In: Diabetologia. 59, 2, p. 275-285 11 p.

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

  15. Published

    Menopausal symptoms: Development and dimensionality of the MenoScores Questionnaire (MSQ)

    Lund, K. S., Waldorff, Frans Boch, Siersma, Volkert Dirk & Brodersen, John Brandt, 15 Jun 2016.

    Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  16. Published

    Perioperative hyperoxia - Long-term impact on cardiovascular complications after abdominal surgery, a post hoc analysis of the PROXI trial

    Fonnes, S., Gogenur, I., Sondergaard, E. S., Siersma, Volkert Dirk, Jørgensen, Lars Nannestad, Wetterslev, J. & Meyhoff, Christian Sylvest, 15 Jul 2016, In: International Journal of Cardiology. 215, p. 238-243

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

  17. Published

    Antibiotic prescribing in Danish general practice 2004-13

    Aabenhus, Rune Munck, Siersma, Volkert Dirk, Hansen, M. P. & Bjerrum, Lars, Aug 2016, In: Journal of Antimicrobial Chemotherapy. 71, 8, p. 2286-2294 9 p.

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

  18. Published

    The role of the anterolateral ligament in ACL insufficient and reconstructed knees on rotary stability: A biomechanical study on human cadavers

    Tavlo, M., Eljaja, S., Tranum-Jensen, Jørgen, Siersma, Volkert Dirk & Krogsgaard, Michael R., Aug 2016, In: Scandinavian Journal of Medicine & Science in Sports. 26, 8, p. 960-966

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

  19. Published

    How does HPV vaccination status relate to risk perceptions and intention to participate in cervical screening? a survey study

    Hestbech, Mie Sara, Gyrd-Hansen, D., Kragstrup, Jakob, Siersma, Volkert Dirk & Brodersen, John Brandt, 3 Aug 2016, In: BMC Public Health. 16, p. 1-11 11 p., 708.

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

  20. 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

  21. Published

    Cerebrospinal Fluid Amyloid Beta and Tau Concentrations Are Not Modulated by 16 Weeks of Moderate- to High-Intensity Physical Exercise in Patients with Alzheimer Disease

    Jensen, C. S., Portelius, E., Siersma, Volkert Dirk, Høgh, Peter, Wermuth, L., Blennow, K., Zetterberg, H., Waldemar, Gunhild, Hasselbalch, Steen & Simonsen, A. H., Oct 2016, In: Dementia and Geriatric Cognitive Disorders. 42, 3-4, p. 146-158 13 p.

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

  22. Published

    Effect of Total Dose of Lidocaine on Duration of Adductor Canal Block, Assessed by Different Test Methods: A Report of Two Blinded, Randomized, Crossover Studies in Healthy Volunteers

    Jæger, P., Koscielniak-Nielsen, Z. J., Hilsted, K. L., Grevstad, U., Siersma, Volkert Dirk, Fabritius, M. L. & Dahl, J. B., Oct 2016, In: Anesthesia and Analgesia. 123, 4, p. 1026-1032 7 p.

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

  23. 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

  24. Published

    Effects of numerical information on intention to participate in cervical screening among women offered HPV vaccination: a randomised study

    Hestbech, Mie Sara, Gyrd-Hansen, D., Kragstrup, Jakob, Siersma, Volkert Dirk & Brodersen, John Brandt, 15 Nov 2016, In: Scandinavian Journal of Primary Health Care. 34, 4, p. 401-419 19 p.

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

  25. 2017
  26. Published

    Clinical indications for antibiotic use in Danish general practice: results from a nationwide electronic prescription database

    Aabenhus, Rune Munck, Hansen, M. P., Siersma, Volkert Dirk & Bjerrum, Lars, 2017, In: Scandinavian Journal of Primary Health Care. 35, 2, p. 162-169 8 p.

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

  27. Published

    Diagnosing Urinary Tract Infection in General Practice

    Holm, Anne, Jessen, Lisbeth Rem, Frimodt-Møller, N., Siersma, Volkert Dirk & Bjerrum, Lars, 2017

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

  28. Published

    Full journal publication of abstracts presented at the Nordic Congress of General Practice in 2009 and 2011

    Waldorff, Frans Boch, Petersen, K., Vinther, S., Sandholdt, H., Siersma, Volkert Dirk & Andersen, John Sahl, 2017, In: Scandinavian Journal of Primary Health Care. 35, 1, p. 84-88 5 p.

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

  29. Published

    Social disparities in diabetes care: a general population study in Denmark

    Heltberg, Andreas Søndergaard, Andersen, John Sahl, Kragstrup, Jakob, Siersma, Volkert Dirk, Sandholdt, H. & Ellervik, Christina, 2017, In: Scandinavian Journal of Primary Health Care. 35, 1, p. 54–63 10 p.

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

  30. Published

    Quality of life following trauma before and after implementation of a physician-staffed helicopter

    Funder, K. S., Rasmussen, L. S., Hesselfeldt, R., Siersma, Volkert Dirk, Lohse, N., Sonne, A., Wulffeld, S. & Steinmetz, J., Jan 2017, In: Acta Anaesthesiologica Scandinavica. 61, 1, p. 111-120

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

  31. Published

    Health-Related Quality-of-Life in patients with chronic rheumatic disease after a multidisciplinary rehabilitation regimen

    Couppé, C., Comins, J., Beyer, N., Hansen, S. E., Stodolsky, D. S. & Siersma, Volkert Dirk, Feb 2017, In: Quality of Life Research. 26, 2, p. 381–391 11 p.

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

  32. Published

    Accreditation in general practice in Denmark: study protocol for a cluster-randomized controlled trial

    Andersen, M. K., Pedersen, L. B., Siersma, Volkert Dirk, Bro, F., Reventlow, Susanne, Søndergaard, J., Kousgaard, Marius Brostrøm & Waldorff, Frans Boch, 13 Feb 2017, In: Trials. 18, p. 1-9 9 p., 69.

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

  33. Published

    Electrical somatosensory stimulation followed by motor training of the paretic upper limb in acute stroke: study protocol for a randomized controlled trial

    Ghaziani, E., Couppé, Christian, Henkel, C., Siersma, Volkert Dirk, Søndergaard, M., Christensen, Hanne Krarup & Magnusson, Stig Peter, 23 Feb 2017, In: Trials. 18, p. 1-9 9 p., 84.

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

  34. Published

    The impact of a physician-staffed helicopter on outcome in patients admitted to a stroke unit: a prospective observational study

    Funder, K. S., Rasmussen, L. S., Lohse, N., Hesselfeldt, R., Siersma, Volkert Dirk, Gyllenborg, J., Wulffeld, S., Hendriksen, O. M., Lippert, F. K. & Steinmetz, Jacob, 23 Feb 2017, In: Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine. 25, p. 1-9 9 p., 18.

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

  35. Published

    Minor amputation does not negatively affect health-related quality of life as compared with conservative treatment in patients with a diabetic foot ulcer: An observational study

    Pickwell, K., Siersma, Volkert Dirk, Kars, M., Apelqvist, J., Bakker, K., Edmonds, M., Holstein, P., Jirkovska, A., Jude, E., Mauricio, D., Piaggesi, A., Reike, H., Spraul, M., Uccioli, L., Urbancic, V., Acker, K. V., Baal, J. V. & Schaper, N., Mar 2017, In: Diabetes - Metabolism: Research and Reviews (Print Edition). 33, 3, 6 p., e2867.

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

  36. Published

    The efficacy of acupuncture on menopausal symptoms (ACOM study): protocol for a randomised study

    Lund, K. S., Brodersen, John Brandt, Siersma, Volkert Dirk & Waldorff, Frans Boch, Mar 2017, In: Danish Medical Journal. 64, 3, p. 1-6 6 p., A5344.

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

  37. Published

    Development and validation of a condition-specific diary to measure severity, bothersomeness and impact on daily activities for patients with acute urinary tract infection in primary care

    Holm, Anne, Cordoba Currea, Gloria Cristina, Siersma, Volkert Dirk & Brodersen, John Brandt, 24 Mar 2017, In: Health and Quality of Life Outcomes. 15, p. 1-8 8 p., 57.

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

  38. Published

    Major depressive symptoms increase 3-year mortality rate in patients with mild dementia

    Petersen, Jindong Ding, Waldorff, Frans Boch, Siersma, Volkert Dirk, Phung, T. K. T., Bebe, Anna & Waldemar, Gunhild, 6 Apr 2017, In: International Journal of Alzheimer's Disease. 2017, p. 1-9 9 p., 7482094.

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

  39. Published

    Clinical accuracy of point-of-care urine culture in general practice

    Holm, Anne, Cordoba Currea, Gloria Cristina, Sørensen, Tina Møller, Jessen, Lisbeth Rem, Frimodt-Møller, N., Siersma, Volkert Dirk & Bjerrum, Lars, Jun 2017, In: Scandinavian Journal of Primary Health Care. 35, 2, p. 170-177 8 p.

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

  40. Published

    Anemia is present years before myelodysplastic syndrome diagnosis: Results from the pre-diagnostic period

    Hansen, Jakob Werner, Sandholdt, H., Siersma, Volkert Dirk, mxz703, mxz703, Holmberg, S., Bjerrum, O. W., Hasselbalch, Hans Carl, Olivarius, Niels de Fine, Grønbæk, Kirsten & Andersen, Christen Bertel L, Jul 2017, In: American Journal of Hematology. 92, 7, p. E130-E132 3 p.

    Research output: Contribution to journal › Comment/debate › Research › peer-review

  41. 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

  42. 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

  43. Published

    In hip osteoarthritis, Nordic Walking is superior to strength training and home based exercise for improving function

    Bieler, T., Siersma, Volkert Dirk, Magnusson, Stig Peter, Kjær, Michael, Christensen, H. E. & Beyer, N., Aug 2017, In: Scandinavian Journal of Medicine & Science in Sports. 27, 8, p. 873–886 14 p.

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

  44. Published

    Identifying practice-related factors for high-volume prescribers of antibiotics in Danish general practice

    Aabenhus, Rune Munck, Siersma, Volkert Dirk, Sandholdt, H., Køster-Rasmussen, Rasmus, Hansen, M. P. & Bjerrum, Lars, 1 Aug 2017, In: Journal of Antimicrobial Chemotherapy. 72, 8, p. 2385-2391 7 p.

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

  45. Published

    Exploring the concurrent validity of the nationwide assessment of permanent nursing home residence in Denmark: A cross-sectional data analysis using two administrative registries

    Bebe, Anna, Nielsen, Anni Brit Sternhagen, Willadsen, Tora Grauers, Søndergaard, J., Siersma, Volkert Dirk, Nicolaisdottir, Dagny Ros, Kragstrup, Jakob & Waldorff, Frans Boch, 29 Aug 2017, In: B M C Health Services Research. 17, p. 1-7 7 p., 607.

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

  46. Published

    Biomonitoring of Danish school children and mothers including biomarkers of PBDE and glyphosate

    Knudsen, Lisbeth E., Hansen, P. W., Mizrak, S., Hansen, H. K., Mørck, T. A., Nielsen, F., Siersma, Volkert Dirk & Mathiesen, Line, 26 Sep 2017, In: Reviews on Environmental Health. 32, 3, p. 279-290 12 p.

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

  47. Published

    Effect of point-of-care susceptibility testing in general practice on appropriate prescription of antibiotics for patients with uncomplicated urinary tract infection: a diagnostic randomised controlled trial

    Holm, Anne, Cordoba Currea, Gloria Cristina, Sørensen, Tina Møller, Jessen, Lisbeth Rem, Frimodt-Møller, N., Siersma, Volkert Dirk & Bjerrum, Lars, Oct 2017, In: B M J Open. 7, 10, 9 p., e018028.

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

  48. Published

    Urinary albumin and 8-oxo-7,8-dihydroguanosine as markers of mortality and cardiovascular disease during 19 years after diagnosis of type 2 diabetes: A comparative study of two markers to identify high risk patients

    Broedbaek, K., Køster-Rasmussen, Rasmus, Siersma, Volkert Dirk, Persson, F., Poulsen, Henrik Enghusen & Olivarius, Niels de Fine, Oct 2017, In: Redox Biology. 13, p. 363-369 7 p.

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

  49. Published

    Socio-demographic determinants and effect of structured personal diabetes care: a 19-year follow-up of the randomized controlled study diabetes Care in General Practice (DCGP)

    Heltberg, Andreas Søndergaard, Siersma, Volkert Dirk, Andersen, John Sahl, Ellervik, Christina, Brønnum-Hansen, Henrik, Kragstrup, Jakob & Olivarius, Niels de Fine, 8 Dec 2017, In: B M C Endocrine Disorders. 17, p. 1-11 11 p., 75.

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

  50. 2018
  51. Published

    Benefits and harms of screening men for abdominal aortic aneurysm in Sweden: a registry-based cohort study

    Johansson, M., Zahl, P. H., Siersma, Volkert Dirk, Jørgensen, K. J., Marklund, B. & Brodersen, John Brandt, 2018, In: Lancet Oncology. 391, 10138, p. 2441-2447 7 p.

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

  52. 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

  53. Published

    Consequences of screening in abdominal aortic aneurysm: development and dimensionality of a questionnaire

    Brodersen, John Brandt, Hansson, A., Johansson, M., Siersma, Volkert Dirk, Langenskiöld, M. & Pettersson, M., 2018, In: Journal of Patient-Reported Outcomes. 2, 12 p., 37.

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

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ID: 3512987