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
| Â | 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) | Â | 19.5 (5.8) | 20.2 (6.9) |
Age at stopping smoking, years, mean (SD) | Â | 41.4 (12.5) | Â |
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 |