Outcomes
| Variable | Before matching | All (N=601 768) | Not African–American (n=519 618) | African–American (n=82 150) | P value | OR (95% CI) | Absolute risk difference (95% CI) |
| Total death | 0 | 569 649 (94.7) | 491 872 (94.7) | 77 777 (94.7) | 0.852 | 0.997 (0.964 to 1.030) | −0.00017 (−0.0018 to 0.0015) |
| 1 | 32 119 (5.3) | 27 746 (5.3) | 4373 (5.3) | ||||
| Exact matched | All (N=112 322) | Not African–American (n=56 161) | African–American (n=56 161) | ||||
| Total death | 0 | 109 014 (97.1) | 54 477 (97) | 54 537 (97.1) | 0.2 | 0.95 (0.87 to 1.03) | −0.001 (−0.003 to 0.001) |
| 1 | 3308 (2.9) | 1684 (3) | 1624 (2.9) |