Table 7

Relative risk (RR) with 95% confidence interval (95% CI) of developing seropositive rheumatoid arthritis for 18–70 years old female and male ex-smokers compared with never-smokers by number of years since smoking cessation

Number of years*Number of exposed casesRR†95% CI
*Number of years between smoking cessation and index year.
†Relative risk adjusted for age, residential area, and sex.
1–9742.21.4 to 3.3
10–19411.50.9 to 2.5
⩾20251.00.5 to 1.9