Table 2.

Cox I and Cox II ratios and smoking status

Current smokersFormer smokersNever smokers
Age mean (median)55.5 (54)64 (66)59 (62)
Cox I (×1,000), mean ± 95% CI58 ± 13*60 ± 9*45 ± 9
Cox II (×1,000), mean ± 95% CI49± 10*51 ± 8*38 ± 7
Pack-year exposure, mean ± 95% CI40.3 ± 7.234.8 ± 3.4
Interval since cessation (y), mean ± 95% CI20.7 ± 1.5
  • Abbreviation: 95% CI, 95% confidence interval.

  • * P < 0.001 when compared with never smoker.