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Table 1 Baseline characteristics by smoking status of 34,101 women from the Swedish Mammography Cohort, 1997

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

  Never smokers
n= 18,424 (54%)
Former smokers
n= 7,817 (23%)
Current smokers
n= 7,806 (23%)
RA cases, number 79 60 80
Age, years, mean (SD) 63.6 (9.2) 58.9 (8.2) 58.9 (8.2)
Body mass index, Kg/m2, mean (SD) 25.2 (3.8) 25.2 (4) 24.4 (3.9)
Age of starting smoking, years, mean (SD)   19.5 (5.8) 20.2 (6.9)
Age at stopping smoking, years, mean (SD)   41.4 (12.5)  
Postmenopausal, % 83.9 72.3 77
Post-secondary education, % 17.3 24.8 17.2
Nulliparous, % 10.2 8.6 8.5
Alcohol users, % 76.2 92.5 91.2
  1. RA, rheumatoid arthritis.