Table 2 Basic description of the whole sample at baseline

Total

2749

770 (28.01)

1979 (71.99)

Gender (Men)

1749 (63.62)

522 (67.79)

1227 (62.00)

Age^a

68.50 (10.97)

67.14 (11.26)

69.02 (10.81)

Charlson Comorbidity index^a

2.88 (1.29)

2.83 (1.22)

2.90 (1.32)

ASA index

 I,II

1548 (57.92)

450 (59.92)

1098 (57.13)

 III

1020 (38.16)

277 (36.88)

743 (38.66)

 IV

105 (3.93)

24 (3.20)

81 (4.21)

Surgical approach (main)

 Open surgery

1139 (41.89)

307 (40.55)

832 (42.41)

 Laparoscopy

1580 (58.11)

450 (59.45)

1130 (57.59)

Laterality of the tumor (Right –transverse side)

834 (42.14)

NA

834 (42.14)

pTNM

 0, I, II

1581 (57.85)

485 (63.32)

1096 (55.72)

 III

892 (32.64)

221 (28.85)

671 (34.11)

 IV

260 (9.51)

60 (7.83)

200 (10.17)