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

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)


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.

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

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