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Table 3 Multivariable adjusted relative risk and 95% confidence interval for rheumatoid arthritis by intensity and duration of cigarette smoking in the Swedish Mammography Cohort, 2003 to 2008

From: Cigarette smoking and smoking cessation in relation to risk of rheumatoid arthritis in women

    Intensity
  Cases, number Never
smokers
Cases, number 1 to 10
Cigarettes/day
Cases, number > 10
Cigarettes/day
Duration       
Never smokers 79 1.00 (ref)   -   -
1 to 30 years (median 17)   - 38 1.96 (1.31, 2.93) 11 1.12 (0.59, 2.14)
> 30 years (median 38)   - 51 2.54 (1.76, 3.69) 25 1.56 (0.98, 2.50)
  1. Results are presented as relative risk (95% CI) adjusted for age (continuous), menopausal status (pre-or postmenopausal), parity (0, 1, 2, or ≥ 3 children), alcohol use (none, former, or current), educational level (lower than high school, high school, or university), and body mass index (quartiles). Ref, reference group.