Table 4

Adjusted ORs for lung cancer comparing ex-smokers with current smokers according to years since quitting

Time since quitting in yearsUnited States Hospital ControlsHospital ControlsJapan Community Controls
OR (95% CI)bOR (95% CI)aOR (95% CI)b
Current Smokers111
Ex-smokers
 1–40.5 (0.3–1.0)0.9 (0.3–2.9)0.9 (0.5–1.7)
 5–90.5 (0.2–0.9)0.8 (0.3–1.8)0.8 (0.5–1.4)
 10–150.4 (0.2–0.8)0.2 (0.1–0.5)0.2 (0.1–0.4)
 16+0.1 (0.1–0.2)c0.2 (0.1–0.4)c0.2 (0.1–0.30)c
  • a Reference group is current-smokers; adjusted for age, education, and hospital.

  • b Reference group is current-smokers; adjusted for age and education.

  • c P < 0.001, test for linear trend.