Table 3.
Bivariate Analysis of Hospital Outcomes.
| Characteristic | Overall, N = 6,418 a | Winter, N = 1,636 a | Spring, N = 1,543 a | Summer, N = 1,811 a | Fall, N = 1,428 a | P-value b | q-value b |
|---|---|---|---|---|---|---|---|
| ED visit within 30 days | 122 (1.9%) | 35 (2.1%) | 27 (1.7%) | 37 (2.0%) | 23 (1.6%) | .7 | >.9 |
| Average days after surgery for ED visit | 8 (4, 15) | 8 (6, 13) | 7 (4, 14) | 8 (5, 13) | 7 (2, 23) | >.9 | >.9 |
| Readmission within 90 days | 192 (3.0%) | 48 (2.9%) | 37 (2.4%) | 58 (3.2%) | 49 (3.4%) | .4 | >.9 |
| Average days after surgery for readmission | 33 (13, 59) | 22 (10, 57) | 33 (16, 59) | 38 (18, 57) | 41 (16, 67) | .6 | >.9 |
| Surgical or medical complication (surgical) | 56 (67%) | 14 (70%) | 12 (60%) | 16 (70%) | 14 (70%) | .9 | >.9 |
| Readmission unplanned or unplanned prior | 192 (3.0%) | 48 (2.9%) | 37 (2.4%) | 58 (3.2%) | 49 (3.4%) | .4 | >.9 |
| Any complication | 83 (1.3%) | 20 (1.2%) | 20 (1.3%) | 23 (1.3%) | 20 (1.4%) | >.9 | >.9 |
| Myocardial infarction within 7 days | 8 (.1%) | 2 (.1%) | 3 (.2%) | 3 (.2%) | 0 (0%) | .4 | >.9 |
| Pneumonia within 7 days | 3 (<.1%) | 0 (0%) | 1 (<.1%) | 0 (0%) | 2 (.1%) | .10 | >.9 |
| Surgical site complication within 30 days | 4 (<.1%) | 1 (<.1%) | 1 (<.1%) | 0 (0%) | 2 (.1%) | .4 | >.9 |
| Pulmonary embolism within 30 days | 4 (<.1%) | 2 (.1%) | 0 (0%) | 1 (<.1%) | 1 (<.1%) | .6 | >.9 |
| Death within 30 days | 2 (<.1%) | 0 (0%) | 1 (<.1%) | 1 (<.1%) | 0 (0%) | .9 | >.9 |
| Fracture within 90 days | 25 (.4%) | 7 (.4%) | 4 (.3%) | 7 (.4%) | 7 (.5%) | .8 | >.9 |
| Dislocation within 90 days | 10 (.2%) | 3 (.2%) | 4 (.3%) | 3 (.2%) | 0 (0%) | .3 | >.9 |
| Mechanical complication within 90 days | 4 (<.1%) | 2 (.1%) | 1 (<.1%) | 1 (<.1%) | 0 (0%) | .8 | >.9 |
| Joint infection within 90 days | 12 (.2%) | 0 (0%) | 2 (.1%) | 5 (.3%) | 5 (.4%) | .066 | .8 |
| Wound infection within 90 days | 11 (.2%) | 3 (.2%) | 3 (.2%) | 2 (.1%) | 3 (.2%) | .9 | >.9 |
an (%); Mean (SD).
bPearson's Chi-squared test; Kruskal-Wallis rank sum test; Fisher's exact test.
cFalse discovery rate correction for multiple testing.