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Table 3 Adjusted odds ratios for developing rheumatoid arthritis according to smoking and rheumatoid factor status in men

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 306 418 1.2 (0.7–2.0)
   Past smoking 234 306 2.0 (1.2–3.2)
RF-positive RA    
   Current smoking 181 418 1.5 (0.8–2.6)
   Past smoking 140 306 2.3 (1.3–3.9)
RF-negative RA    
   Current smoking 125 418 0.8 (0.3–1.8)
   Past smoking 94 306 1.5 (0.7–3.0)
  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.