| Author and year of Publication | [26] | [17] | [3] |
| Population | All patients undergoing clean surgery (n = 660) | All patients undergoing elective surgery (n = 1429) | All patients undergoing clean surgery (n = 2113) |
| Intervention | Use of face mask | Use of face mask | Use of face mask |
| Comparator | Non-use | Non-use | Non-use |
| Outcomes | Postoperative wound infection | Postoperative wound infection | Postoperative wound infection |
| Study Design | RCT Follow-up = 33.4 days | RCT Follow-up = until after discharge | RCT Follow-up = until after discharge |