Table 4.

Intraoperative characteristics, length of stay and mortality by surgical site infection (SSI) occurrence

Variable	All hepatectomy patients (n = 2332)	Patients without SSI (n = 2064, 88.5%)	Patients with SSI (n = 268, 11.5%)	P-value
Wound class dirty/infected, %	5.5	5.1	8.2	0.038
Operative duration, min, mean ± SD	253 ± 122	247 ± 120	299 ± 132	<0.001
Transfused intraoperatively				<0.001
1–2 units PRBCs, %	14.1	14.2	13.9
≥3 units PRBCs, %	14.8	13.6	24.0
Length of stay, days, mean ± SD	8.2 ± 8.8	7.5 ± 7.6	13.6 ± 14.1	<0.001
Return to OR within 30 days of surgery, %	5.0	3.5	16.0	<0.001
Mortality, %	2.5	2.1	5.2	0.002

P < 0.001.

SD, standard deviation; PRBCs, packed red blood cells; OR, operating room.