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Incidence of acute postoperative infections at 90 d following total hip arthroplasty
| Location | Spring | Summer | Fall | Winter | χ2 |
| North East | 1.41% | 1.35% | 1.35% | 1.47% | 0.281 |
| Mid West | 1.54% | 1.59% | 1.51% | 1.60% | 0.39 |
| South | 1.60% | 1.68% | 1.58% | 1.64% | 0.277 |
| West | 1.25% | 1.59% | 1.31% | 1.43% | < 0.001 |
| Mean | 1.45% | 1.55% | 1.44% | 1.54% | |
| SD | 0.16% | 0.14% | 0.13% | 0.10% |
