Table 3 COX proportional hazard analysis for adverse outcomes
|  | HTO(n = 49,270) | UKA (n = 21,194) | Crude | adjusted* | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
N | % | 1,000 PY | N | % | 1,000 PY | HR | 95% CI | P-value | HR | 95% CI | P-value | ||
Deep vein thromboembolism | events | 251 | (0.51%) | 1.30 | 394 | (1.86%) | 4.13 | 0.29 | (0.25, 0.34) |  < .0001 | 0.33 | (0.28,0.39) |  < .0001 |
days | 738.35 |  ± 923.41 | 303.32 |  ± 659.29 | |||||||||
Pulmonary thromboembolism | events | 113 | (0.23%) | 0.59 | 87 | (0.41%) | 0.91 | 0.62 | (0.47, 0.82) | 0.001 | 0.75 | (0.56,1.01) | 0.06 |
days | 557.09 |  ± 775.84 | 850.03 |  ± 1045.18 | |||||||||
Cerebrovascular disease | events | 6475 | (13.14%) | 33.61 | 3699 | (17.45%) | 38.79 | 0.83 | (0.80, 0.87) |  < .0001 | 1.02 | (0.98,1.06) | 0.36 |
days | 802.38 |  ± 828.81 | 874.19 |  ± 867.41 | |||||||||
Myocardial infarction | events | 391 | (0.79%) | 2.03 | 231 | (1.09%) | 2.42 | 0.83 | (0.71, 0.98) | 0.03 | 0.88 | (0.74,1.04) | 0.12 |
days | 880.55 |  ± 916.71 | 1024.94 |  ± 1000.18 | |||||||||
Acute renal failure | events | 238 | (0.48%) | 1.24 | 167 | (0.79%) | 1.75 | 0.72 | (0.59, 0.88) | 0.001 | 0.81 | (0.66,1.02) | 0.08 |
Days | 1042.95 |  ± 964.47 | 1225.66 |  ± 1029.08 | |||||||||
Postoperative Delirium | events | 40 | (0.08%) | 0.21 | 32 | (0.15%) | 0.34 | 0.65 | (0.41, 1.04) | 0.07 | 0.97 | (0.59,1.59) | 0.90 |
Days | 1169.35 |  ± 924.57 | 1479.34 |  ± 1072.69 | |||||||||
Surgical site infection | events | 400 | (0.81%) | 2.08 | 483 | (2.28%) | 5.06 | 0.38 | (0.33, 0.44) |  < .0001 | 0.40 | (0.35, 0.46) |  < .0001 |
days | 541.42 |  ± 777.47 | 558.08 |  ± 785.58 | |||||||||