Table 5. Explorative univariate analysis of patients presenting any postoperative colonization or infection.

Analyzed variable	Patient without any postoperative colonization or infection (n=24)	Patient with any postoperative colonization or infection (n=17)	P value
Demographic characteristics
Male gender [%]	22 [92]	15 [88]	0.71
Age ± SD (years)	46±4	42±5	0.48
BMI	23±0.9	24±0.8	0.79
Admission characteristics
SAPS II score	49±4	45±4	0.56
SOFA score at admission	6±0.5	5±0.7	0.22
Type of admission, n [%]			0.29
Trauma	15 [63]	15 [88]
Surgery	5 [21]	1 [6]
Medical	4 [17]	1 [6]
Evolution before surgery
Time of MV before surgery (days)	11±4	5±0.6	0.24
Time before surgery (days)	11±4	5±0.6	0.28
Use of SOD before surgery [%]	11 [46]	10 [59]	0.41
Use of antibiotic for any infection before surgery, n [%]	6 [25]	0	0.03
Evolution after surgery
SOFA score at surgery day	5±0.6	4±0.6	0.62
ASA score at surgery day	4±0.2	4±0.2	0.89
SAP group, n [%]			0.28
1	7 [29]	1 [6]
2	2 [8]	3 [18]
3	3 [13]	2 [12]
4	12 [50]	11 [65]
Total length of ICU stay (days)	28±9	33±5	0.61
Death, n [%]	5 [21]	3 [18]	0.80

Quantitative variables are presented with standard error. BMI, body mass index; SAPS, Simplified Acute Physiology Score; SOFA, Sequential Organ Failure Assessment; MV, mechanical ventilation; SDD, selective digestive decontamination; ASA, American Society of Anesthesiologist; SAP, surgical antimicrobial prophylaxis; ICU, intensive care unit.