|  |  |  | Relative risk of lung cancer* | |
---|---|---|---|---|---|
 | N | Cases | Age-adjusted risk (95% CI)** | Model A RR (95% CI) | Model B RR (95% CI) |
Categories of ACEs, No. | Â | Â | Â | Â | Â |
   0 | 6124 | 53 | 359.4 (268.7-480.6) | 1.00 (referent) | 1.00 (referent) |
   1 | 4411 | 26 | 248.8 (168.9-366.3) | 0.75 (0.47, 1.20) | 0.69 (0.43, 1.11) |
   2 | 2681 | 28 | 720.5 (394.8-1311.0) | 1.52 (0.95, 2.42) | 1.35 (0.84, 2.16) |
   3 | 1599 | 18 | 805.5 (492.8-1313.9) | 1.92 (1.11, 3.33) | 1.58 (0.90, 2.76) |
   4 or 5 | 1637 | 15 | 641.0 (373.9-1096.6) | 1.88 (1.04, 3.41) | 1.51 (0.83, 2.78) |
   6, 7, or 8 | 449 | 4 | 635.8 (239.5-1676.8) | 2.70 (0.94, 7.72) | 1.83 (0.63, 5.35) |
 |  |  |  | P for trend = 0.001 | P for trend = 0.017 |
Smoking status | Â | Â | Â | Â | Â |
   Never | 8589 | 16 | 108.4 (64.9-179.8) |  | 1.00 (referent) |
   Former | 6879 | 90 | 539.6 (426.0-683.2) |  | 4.83 (2.80-8.33) |
   Current, <20 cig/d | 870 | 13 | 1166.8 (676.2-2006.2) |  | 10.11 (4.78-21.39) |
   Current, ≥ 20 cig/d | 563 | 25 | 3448.5 (2210.2-5342.7) |  | 25.48 (13.10-49.56) |
Total | 16,901 | 144 | 432.3 (362.2-515.7) | Â | Â |