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Table 2 Summary of recent epidemiological studies showing the association between rheumatoid arthritis and cigarette smoking

From: Epidemiology and genetics of rheumatoid arthritis

Study Cases (n) Controls (n) Smoking group Odds ratio (95% confidence interval)
[78] 239 239 41–50 pack years 13.5 (2.9–63.4)
    Ever 1.8 (1.2–2.2)
    Never 1.0
[66] 165 178 Current 0.95 (0.6–1.6)
    Ex 1.7 (0.95–3.1)
    Never 1.0
[79] 7697 370,000 Current 1.2 (1.1–1.3)
    Ex 1.0 (0.95–1.1)
    Never 1.0
[67] 361 5851 Current (males) 2.4 (1.5–3.9)
    Current (females) 1.1 (0.8–1.6)
    Never 1.0