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Important but incomplete data analysis?
  1. Philipp Sewerin1,
  2. Annika Hoyer2,
  3. Matthias Schneider1,
  4. Ben Ostendorf1,
  5. Ralph Brinks1
  1. 1 Department and Hiller Research Unit of Rheumatology, University Duesseldorf, Duesseldorf, Germany
  2. 2 Institute for Biometry and Epidemiology, German Diabetes Center, Duesseldorf, Germany
  1. Correspondence to Dr Philipp Sewerin, Department and Hiller Research Unit of Rheumatology, University Duesseldorf, Germany; philipp.sewerin{at}

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We are grateful to the article about incidence and prevalence of psoriatic arthritis (PsA) in Denmark by Egeberg et al.1 The comprehensive health registers from Denmark and other Nordic countries have proven to yield many insights into the epidemiology of chronic diseases. The authors of the article provide very detailed information about the age-specific incidence of PsA, including its time trend. However, we have a question about reporting the overall age-specific incidence rate, combined for both sexes. Could the authors comment …

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  • Competing interests None declared.

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

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