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Table 4 Relative risk of rheumatoid arthritis among former smokers by years since quitting and age at quitting cigarette smoking in the Swedish Mammography Cohort, 2003 to 2010

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

  Person-years1 Cases, number1 Age-adjusted relative risk 95% CI Multivariable relative risk2 95% CI
Never smokers 137,162 79 1.00 (ref)   1.00 (ref)  
Years since quitting       
1-14 23,297 20 1.45 0.88, 2.38 1.50 0.68, 3.30
≥ 15 (median 24) 35,613 39 1.85 1.25, 2.73 1.99 1.23, 3.20
Age at quitting       
≤ 41 (median 32) 31,164 31 1.68 1.09, 2.59 1.94 1.18, 3.18
> 41 (median 50) 27,747 28 1.70 1.11, 2.62 2.02 1.01, 4.07
  1. 1 Numbers do not add up to the totals because of missing values. 2Adjusted 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), body mass index (quartiles), and pack-years of smoking (continuous among former smokers). Ref, reference group.