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Ann Rheum Dis 65:601-606 doi:10.1136/ard.2005.039172
  • Extended report

Smoking is a strong risk factor for rheumatoid nodules in early rheumatoid arthritis

  1. B-M Nyhäll-Wåhlin1,
  2. L T H Jacobsson2,
  3. I F Petersson3,
  4. C Turesson2,
  5. the BARFOT study group1
  1. 1Department of Rheumatology, Falun Hospital, Falun, Sweden
  2. 2Department of Rheumatology, Malmö University Hospital, Malmö, Sweden
  3. 3Spenshult Hospital for Rheumatic Diseases, Oskarström, Sweden
  1. Correspondence to:
    Dr Britt-Marie Nyhäll-Wåhlin
    Department of Rheumatology, Falun Hospital, SE-791 82 Falun, Sweden; britt-marie.nyhall-wahlin{at}ltdalarna.se
  • Accepted 7 September 2005
  • Published Online First 15 September 2005

Abstract

Objective: To examine whether smoking is a risk factor for rheumatoid nodules in early rheumatoid arthritis, and if so to determine the quantitative effect of smoking.

Methods: From a cohort (n = 1589) in a structured programme for follow up of newly diagnosed cases of rheumatoid arthritis (symptoms of swollen joints ⩽12 months), 112 individuals with rheumatoid nodules at inclusion were identified. Nodular patients were each compared with two age and sex matched controls without nodules from the same cohort. A detailed self administered tobacco use questionnaire was answered by 210 patients (63%).

Results: Seventy patients were current smokers, 71 former smokers, and 69 had never smoked. Current smoking and former smoking were more common in patients with rheumatoid nodules compared with controls (86% v 59%) in both sexes. Positive rheumatoid factor (RF) was found more often among cases with nodules than controls (78% v 64%). Using detailed information from the questionnaires with conditional logistic regression analyses, ever having smoked was associated with an increased risk of the presence of rheumatoid nodules (odds ratio (OR) = 7.3 (95% confidence interval, 2.3 to 23.6); p = 0.001). The risk of having nodules was not obviously dose dependent when smoking duration as well as smoking amount were examined. A stratified analysis showed that only RF positive smokers had an increased risk of rheumatoid nodules. Smoking was associated with rheumatoid nodules among both men (p = 0.006) and women (p = 0.001). Tobacco use other than smoking (n = 31) was not associated with an increased risk of nodules (OR = 0.8 (0.2 to 3.4); p = 0.813).

Conclusions: There is a strong association between smoking and rheumatoid nodules in early seropositive rheumatoid arthritis.

Footnotes

  • 1 Members of the BARFOT study group are listed at the end of the article.

  • Published Online First 15 September 2005