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Does the season at symptom onset influence the long-term severity of radiographic joint destruction in rheumatoid arthritis?
  1. D P C de Rooy1,
  2. M L E Andersson2,
  3. R Knevel1,
  4. T W J Huizinga1,
  5. B Svensson2,
  6. A H M van der Helm-van Mil1
  1. 1Department of Rheumatology, Leiden University Medical Center, The Netherlands
  2. 2Section of Rheumatology at the Institution of Clinical Science, for the BARFOT study group, Lund University, Skåne University Hospital, Lund, Sweden
  1. Correspondence to D P C de Rooy, Department of Rheumatology, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, The Netherlands; d.p.c.de_rooy{at}lumc.nl

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Season-associated environmental factors have been related to the onset of rheumatoid arthritis (RA) and the severity of joint complaints.1 ,2 A recent study demonstrated that the onset of arthritis symptoms during winter or spring was associated with more radiographic joint damage after 1 year.3 This led us to evaluate the influence of the season of symptom onset on long-term radiographic progression.

Six hundred and eighty-eight RA-patients, from the Leiden Early Arthritis Clinic (EAC) and 830 RA-patients from the Swedish BARFOT-study were included in the study.4 ,5 These cohorts were similar in the percentage of women patients, age, symptom duration, swollen joint count, C reactive protein and the percentage of anti-cyclic citrullinated protein antibody positive patients (data not shown). During a follow-up period of 5 and 7 years, a total of 6990 hands and feet x-ray sets were obtained and scored for joint damage according to the Sharp-van-der-Heijde method ( all …

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