Historic Controls n=68 Study Group n=104 p-value
Age (yr-old) 62 (56-74) 63 (52-69) 0.36
Sex (M/F) 47/21 71/33 1
BMI (kg/m2) 25 (21-28) 26 (23-29) 0.16
ASA Score
I
II
III
IV

3 (4%)
44 (65%)
20 (29%)
1 (2%)

12 (12%)
72 (69%)
19 (18%)
1 (1%)
0.18
Presence of cirrhosis n (%) 18 (26) 20 (19) 0.26
Previous abdominal surgery n (%) 43 (63) 69 (66) 0.74
Indication to hepatic resection
Primary liver tumor
Liver metastases
Other benign tumor

30 (44%)
28 (40%)
10 (16%)

37 (36%)
56 (53%)
11 (11%)
0.37
Hemoglobin (mg/dL) 13 (11.8-14) 13 (12-14.4) 0.25
Ratio Prothrombin Time 1.07 (1.01-1.12) 1.03 (0.96-1.10) 0.01
Platelets (x109/L) 183 (150-286) 201 (148-260) 0.86
Definition of Abbreviations: BMI=Body Mass Index; ASA = American Society of Anesthesiologists; p=statistical significance comparing both groups. Data expressed as median (25-75%)
Table 1: Comparison of preoperative clinical and demographic characteristics between historic controls (2009) and study group (January 2012-June 2013).