Jonas Ranstam

Medical statistician


This page presents links to selected published papers. Most of these papers can be freely downloaded.

  1. Ranstam J, Cook JA. Kaplan-Meier curve. Br J Surg. 2017;104:442.
  2. Cook JA, Ranstam J. Statistical models and confounding adjustment. The British journal of surgery 2017;104:786-787.
  3. Cook JA, Ranstam J. Spurious findings. Br J Surg 2017;104:97.
  4. Cook JA, Ranstam J. Overfitting. Br J Surg. 2016;103:1814.
  5. Ranstam J, Cook JA. Causal relationship and confounding in statistical models. Br J Surg. 2016;103:1445-1446.
  6. Cook JA, Ranstam J. Statistical analyses that provide an effect size are to be preferred. Br J Surg 2016;103:1365.
  7. Ranstam J, Cook JA. Considerations for the design, analysis and presentation of in vivo studies. Osteoarthritis Cartilage 2016 Jul 30. pii: S1063-4584(16)30191-1.
  8. Ranstam J, Cook JA. Statistical models: an overview. Br J Surg 2016;103:1047.
  9. Ranstam J. Multiple p-values and Bonferroni correction. Osteoarthritis Cartilage. 2016 Jan 21
  10. Losina E, Ranstam J, Collins J, Katz JN. Key analytic considerations in design and analysis of randomized controlled trials in osteoarthritis. Osteoarthritis Cartilage 2015;23:674–676.
  11. Ranstam J. The importance of clear language. Acta Orthopaedica 2013;84(6).
  12. Ranstam J. Why the p-value culture is bad and confidence intervals a better alternative. Osteoarthritis and Cartilage 2012 April 11.
  13. Ranstam J. Repeated measurements, bilateral observations and pseudoreplicates, why does it matter? Osteoarthritis and Cartilage 2012;20:473-475.
  14. Ranstam et al. Alternative analyses for handling incomplete follow-up in the intention-to-treat analysis: the randomized controlled trial of balloon kyphoplasty versus non-surgical care for vertebral compression fracture (FREE). BMC Medical Research Methodology 2012,12:35 (24 March 2012).
  15. Ranstam et al. Statistical analysis of arthroplasty data. I. Introduction and background. Acta Orthopaedica 2011;82:253–257.
  16. Ranstam et al. Statistical analysis of arthroplasty data. II. Guidelines. Acta Orthopaedica 2011;82:258–267.
  17. Ranstam J, Lohmander LS. What’s in a number or in a picture? Osteoarthritis and Cartilage 2010;18:1003-1005.
  18. Ranstam J, Robertsson O. Statistical analysis of arthroplasty register data. Acta Orthopaedica 2010;81:10-14. 
  19. Ranstam J. Sampling uncertainty in medical research. Osteoarthritis and Cartilage 2009;17:1416-1419.
  20. Ranstam et al. Health-care quality registers: outcome-orientated ranking of hospitals is unreliable. Journal of Bone and Joint Surgery 2008;Br90:1558-1561.
  21. Ranstam J. Accuracy, precision, and validity. Acta Radiologica 2008;49:105-106.
  22. Ranstam J. Statistical significance. Acta Radiologica 2008;49:220-221.
  23. Ranstam J. Analysis units. Acta Radiologica 2008;49:371-372.
  24. Ranstam J. Patient number calculations. Acta Radiologica 2008;49:398-399.
  25. Ranstam J. Negative results. Acta Radiologica 2008;49:521-522.
  26. Ranstam J. Bias in observational studies. Acta Radiologica 2008;49:644-645.
  27. Ranstam J. Adjusting results for confounding bias. Acta Radiologica 2008;49:769-770.
  28. Ranstam J. Planning a randomized trial. Acta Radiologica 2008;49:893-894.
  29. Ranstam J. Analyzing a randomized trial. Acta Radiologica 2008;49:1005-1006.
  30. Ranstam J. Data handling, statistical computing, and archiving. Acta Radiologica 2008;49:1137-1139.
  31. Robertsson O, Ranstam J, Lidgren L. Variation in outcome and ranking of hospitals: an analysis from the Swedish knee arthroplasty register. Acta Orthopaedica 2006;77:487-493.
  32. Robertsson O, Ranstam J. No bias of ignored bilaterality when analysing the revision risk of knee prostheses: analysis of a population based sample of 44,590 patients with 55,298 knee prostheses from the national Swedish Knee Arthroplasty Register. BMC Musculoskeletal Disorders 2003;4:1 Feb.
  33. Ranstam J. P-values in research reports. Acta Orthopaedica 2005;76:290-290.
  34. Ranstam J. Problems in orthopedic research: dependent observations. Acta Orthop Scand 2003;73:447-450.
  35. Ranstam J. Ryd L, Onsten I. Accurate accuracy assessment: review of basic principles. Acta Orthop Scand 1999;70:319-321.
  36. Ranstam J. Repeated measurement and analysis units. Review of basic principles. Acta Orthop Scand 1998;69:345-346.
  37. Ranstam J. A common misconception about p-values and its consequences. Acta Orthop Scand 1996;67:505-507.
  38. Ranstam J. Statistics and medical research. Basic principles review. Acta Orthop Scand 1995;66:193-195.