Associations may exist between asthma, allergies and rheumatoid arthritis, according to a study recently published in Arthritis & Rheumatology.  Rheumatoid arthritis does not appear to be associated with passive exposure to smoke.

This case-control study included 1023 individuals with rheumatoid arthritis, 175 of whom had incident rheumatoid arthritis. Participants were treated within a single center and were identified using a combination of self-reporting and 2 diagnostic codes. Biobank questionnaires were used for self-reporting exposures. Proportions were compared using chi-square tests, with continuous variable comparison conducted using Wilcoxon rank-sum tests. The correlations between exposures and rheumatoid arthritis were calculated using adjusted logistic regression models.

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