TABLE 3.
Microbiologic and antibiotic treatment of patients by dichotomized LOS.
| Total | LOS ≤ 7 days | LOS > 7 days | p- value* | |
| Cultures obtained in the OR/IR§ (%) | 94 (76.4) | 53 (72.6) | 41 (82.0) | 0.228 |
| Positive peritoneal cultures† (%) | 86 (91.5) | 46 (86.8) | 40 (97.6) | 0.064 |
| Polymicrobial (%) | 71 (82.6) | 36 (78.3) | 35 (87.5) | 0.201 |
| Antibiotic utilization | ||||
| Antibiotic change during admission (%)¶ | 18 (14.6) | 4 (8.7) | 14 (35.0) | 0.003 |
| Empiric antibiotic mismatch (> 24 h) (%)$ | 15 (17.4) | 5 (10.9) | 10 (25.0) | 0.085 |
| Days of antibiotics (IV + PO)** | 7.7 ± 3.6 | 5.7 ± 1.1 | 10.7 ± 4.0 | <0.001 |
| Days of prescribed after discharge** | 4.1 ± 5.2 | 3.0 ± 3.5 | 5.8 ± 6.6 | 0.002 |
$Number of patients with a mismatch, defined as empiric antibiotic therapy ≥ 24 h that did not match susceptibilities of recovered intraperitoneal (IP) bacteria. ¶Number of antibiotic changes after initial regimen. **Mean ± standard deviation.