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Table 2 Adjusted odds ratios for developing rheumatoid arthritis according to smoking and rheumatoid factor status in women

From: Smoking–gender interaction and risk for rheumatoid arthritis

  Number of observations entering the multivariable model  
Parameter RA cases Controls Odds ratio* (95% CI)
All RA    
   Current smoking 751 1083 0.7 (0.4–1.0)
   Past smoking 504 851 0.9 (0.6–1.3)
RF-positive RA    
   Current smoking 452 1083 0.6 (0.3–1.0)
   Past smoking 365 851 0.8 (0.6–1.3)
RF-negative RA    
   Current smoking 299 1083 0.84 (0.5–1.5)
   Past smoking 238 851 0.94 (0.6–1.5)
  1. *Odds ratios are expressed as the expected probability of having rheumatoid arthritis (RA) as compared with those who did not smoke. The confounders adjusted for in the multivariable logistic regression models included age, body mass index, number of years of education, Health Assessment Questionnaire disability index, general health assessment, and pain. CI, confidence interval.