Number of patients receiving antibiotic on fifth postoperative day, and the reason for prescribing antibiotics
| Control n=506 | Intervention n=466 | |
| Receiving antibiotic | ||
| On fifth postoperative day (95% CI) | 64/12.6% (9.9 to 15.9) | 36/7.7% (5.5 to 10.5) |
| Reason for prescribing antibiotic | ||
| Airway infection (95% CI) | 24/4.7% (3.1 to 7.0) | 12/2.6% (1.3 to 4.5) |
| Superficial surgical | ||
| Site infection (95% CI) | 19/3.8% (2.3 to 5.8) | 14/3.0% (1.5 to 5.0) |
| Deep surgical site | ||
| Infection (95% CI) | 6/1.2% (0.5 to 2.6) | 2/0.4% (0.1 to 1.5) |
| Urinary tract | ||
| Infection (95% CI) | 2/0.04% (0 to 0.14) | 1/0.02% (0 to 0.12) |
| Other infections* (95% CI) | 13/2.6% (1.4 to 4.4) | 4/0.9% (0.2 to 2.2) |
*Other infections: endocarditis, pericarditis, chronic infection in the hip, no specific focus for infection, increase in infection parameters.