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Adjusted and crude odds ratio (OR) and 95% confidence interval (CI) of occurrence of superficial surgical site infections in all patients according to preoperative risk factors 1 week prior to operation. 3 observations were deleted due to being missing. Adjustments were made for ASA class II, age, and sex
| Risk factor | Adjusted OR [CI] | Crude OR [CI] |
|---|---|---|
| Group: intervention | 0.64 [0.42–0.97] | 0.71 [0.40–1.07] |
| ASA class II or above | 1.83 [1.17–2.82] | |
| Age | 1.02 [0.99–1.04] | |
| Male sex | 1.67 [1.11–2.54] |
