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The varieties of the up-regulated antibiotics of the control and lavage groups n (%)
| Control group (n = 254) | Lavage group (n = 678) | P value | |
| Imipenem | 4 (1.6) | 29 (4.3) | 0.047 |
| Ceftriaxone | 8 (3.1) | 21 (3.1) | 1.000 |
| Moxifloxacin | 11 (4.3) | 57 (8.4) | 0.034 |
| Piperacillin-tazobactam | 15 (5.9) | 69 (10.2) | 0.041 |
| Cefoperazone-sulbactam | 18 (7.1) | 80 (11.8) | 0.041 |
| Levofloxacin | 4 (1.6) | 10 (14.7) | 0.261 |
| Ciprofloxacin | 5 (2.0) | 7 (10.3) | 1.000 |
| Others | 7 (2.8) | 18 (26.5) | 0.439 |
| Total | 72 (28.3) | 291 (42.9) | 0.005 |
