Characteristics of the operative procedures selected for pre-intervention and post-intervention chart review relevant to the assessment of the timeliness of antibiotics
| Pre-intervention | Post-intervention | |
| Study site | ||
| Hospital A | 132 | 133 |
| Hospital B | 117 | 115 |
| Hospital C | 91 | 92 |
| Surgeon | ||
| Surgeon 1 | 58 | 53 |
| Surgeon 2 | 16 | 19 |
| Surgeon 3 | 42 | 38 |
| Surgeon 4 | 16 | 23 |
| Surgeon 5 | 69 | 68 |
| Surgeon 6 | 48 | 47 |
| Surgeon 7 | 21 | 19 |
| Surgeon 8 | 22 | 23 |
| Surgeon 9 | 20 | 26 |
| Surgeon 10* | 8 | 0 |
| Surgeon 11 | 20 | 24 |
| Type of procedure | ||
| Hernia repair | 42 | 42 |
| Laparoscopic cholecystectomy, splenectomy, appendectomy | 30 | 35 |
| Colon and abdominal procedures (eg, anterior resection, ileostomy) | 230 | 223 |
| Breast and lymph node procedures | 9 | 5 |
| Thyroid and adrenal procedures | 10 | 10 |
| Anal–rectal procedures and examinations under anaesthesia (eg, haemorrhoidectomy, fistula) | 19 | 25 |
| Antibiotics administered | ||
| Gentamicin | 8 | 1 |
| Cefazolin | 89 | 98 |
| Cefoxitin | 37 | 29 |
| Clindamycin | 8 | 2 |
| Metronidazole | 5 | 3 |
| Gentamicin + Ampicillin | 5 | 3 |
| Gentamicin + Metronidazole | 83 | 78 |
| Cefazolin + Metronidazole | 26 | 66 |
| Ciprofloxacin + Metronidazole | 6 | 5 |
| Gentamicin + Cefazolin + Metronidazole | 19 | 19 |
| Gentamicin + Ampicillin + Metronidazole | 8 | 6 |
| Other antibiotics and antibiotic combinations† | 11 | 12 |
| Cannot be determined‡ | 35 | 18 |
| Total | 340 | 340 |
↵* Observed and included in the pre-intervention study phase but excluded from the post-intervention sample due to the opinion of the researchers that having an observer in the operating room was disruptive to this surgeon's surgical practice.
↵† Includes a total of 15 different antibiotic regimens; each administered ≤3 times during pre-intervention and post-intervention study phases.
↵‡ Includes some cases coded as not documented.