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Inconsistency between Danish incidence and prevalence data about psoriatic arthritis (PsA)
  1. Philipp Sewerin1,
  2. Annika Hoyer2,
  3. Matthias Schneider1,
  4. Benedikt Ostendorf1,
  5. Ralph Brinks1
  1. 1Department and Hiller Research Unit of Rheumatology, University Düsseldorf, Düsseldorf, Germany
  2. 2Institute for Biometry and Epidemiology, German Diabetes Center, Düsseldorf, Germany
  1. Correspondence to Dr Philipp Sewerin, Department and Hiller Research Unit of Rheumatology, University Duesseldorf, Duesseldorf 40225, Germany; philipp.sewerin{at}

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We are grateful to Egeberg and Kristensen for presenting the detailed data about the prevalence and incidence of psoriatic arthritis (PsA).1 Based on these detailed information, we tried to estimate the excess mortality of people with diagnosed PsA by uising a mathematical relation between incidence, prevalence and mortality.2 3 During analysis of the incidence and prevalence data, we have made the following observation: if we assume thaton population averagepeople with PsA do not have a better survival than those without PsA, we can compute a lower …

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  • Handling editor Josef S Smolen

  • Competing interests None declared.

  • Provenance and peer review Not commissioned; internally peer reviewed.