Contrast of averages between the SSI and No SSI groups
| Factor | SSI | Mean ± SD |
|---|---|---|
| EC fungi, no. CFU* | No | 0.85 ± 1.147 |
| Yes | 2.47 ± 1.883 | |
| EC bacteria, no. CFU* | No | 1.11 ± 1.316 |
| Yes | 3.05 ± 2.004 | |
| SC fungi, no. CFU* | No | 0.64 ± 0.864 |
| Yes | 1.57 ± 1.430 | |
| SC bacteria, no. CFU* | No | 1.22 ± 1.118 |
| Yes | 1.79 ± 1.027 | |
| Temperature, °C* | No | 24.15 ± 1.807 |
| Yes | 24.44 ± 2.532 | |
| Humidity, %* | No | 48.76 ± 3.560 |
| Yes | 54.71 ± 5.055 | |
| Differential pressure, Pa | No | 4.21 ± 5.675 |
| Yes | 4.12 ± 5.228 | |
| Air renewal rate, no./h* | No | 22.88 ± 1.857 |
| Yes | 21.66 ± 5.810 | |
| Age, yr* | No | 64.41 ± 15.971 |
| Yes | 67.55 ± 14.237 | |
| Duration of intervention, min* | No | 141.69 ± 24.719 |
| Yes | 184.12 ± 15.870 | |
| Comorbidity, no* | No | 0.81 ± 0.773 |
| Yes | 2.26 ± 1.526 | |
| Nasogastric tube, d* | No | 1.66 ± 1.893 |
| Yes | 2.67 ± 3.329 | |
| Immunosuppression, d* | No | 1.16 ± 2.083 |
| Yes | 1.32 ± 1.281 | |
| Albumin level, g/100 mL* | No | 4.347 ± 0.753 |
| Yes | 3.805 ± 0.499 |
CFU = colony-forming units; EC = environmental contamination; SC = surface contamination; SD = standard deviation; SSI = surgical site infection.
↵* p < 0.05.