Table 1

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

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


RA, rheumatoid arthritis.

Di Giuseppe et al. Arthritis Research & Therapy 2013 15:R56   doi:10.1186/ar4218

Open Data