Table 1.

Demographics and clinical characteristics of the included patients, overall and by type of surgery (colorectal cancer surgery and hysterectomy).

Patient characteristics	Colorectal cancer surgery (N = 1972)	Hysterectomy (N = 1812)	Total (N = 3,784)
	n (%)	n (%)	n (%)
Gender
Male	1,115 (56.5)	_	1,115 (29.5)
Female	857 (43.5)	1812 (100)	2,669 (70.5)
Age – mean (std)	71.1 (10.9)	55.4 (11.6)	63.6 (13.7)
18–65 yrs	547 (27.7)	1,419 (78,3)	1966 (52.0)
65+ yrs	1,425 (72.3)	393 (21.7)	1818 (48.0)
American Society of Anesthesiologists classification
I– II	1,136 (57.6)	1,511 (83.5)	2,647 (70.0)
III– IV	835 (42.4)	298 (16.5)	1,133 (30.0)
Marital Status
Married	1,345 (68.2)	1,162 (64.1)	2,507 (66.3)
Single	563 (28.6)	621 (34.3)	1,184 (31.3)
Missing	64 (3.3)	29 (1.6)	93 (2.4)
Employment status
Working	445 (22.6)	1,019 (56.2)	1,464 (38.7)
Retired	1,267 (64.3)	339 (18.7)	633 (16.3)
Unemployed	202 (10.2)	431 (23.8)	1,606 (41.4)
Missing	58 (2.9)	23 (1.3)	81 (2.1)
Education
Elementary (5 yrs)	542 (27.5)	187 (10.3)	729 (19.3)
Intermediate (8 yrs)	656 (33.3)	588 (32.5)	1,244 (32.9)
Secondary school	510 (25.9)	811 (44.8)	1,321 (34.9)
Degree	113 (5.7)	189 (10.4)	302 (7.8)
Misssing	151 (7.7)	37 (2.0)	188 (5.0)
Charlson Comorbidity Index
0	1,518 (77.0)	1,658 (91.5)	3,176 (88.0)
≥1	454 (23.0)	154 (8.5)	608 (18.0)
Presence of at least one complication
Surgical complications	314 (15.9)	65 (3.6)	379 (10.0)
Medical complications	307 (15.6)	52 (2.9)	359 (9.5)
Total complications	522 (26.5)	113 (6.2)	635 (16.8)
Admission in Intensive Care Unit (ICU)
No	1720 (87.2)	1770 (97.7)	3,490 (92.2)
yes	252 (12.8)	42 (2.3)	294 (7.6)
ICU days – median: IQRange (Q1;Q3)	1: (1; 1)	1: (1; 1)	1: (1; 1)
Length of Hospital stay, days – median: IQRange (Q1;Q3)	7: (5; 9)	3: (2; 4)	5: (3; 7)
Type of surgery
Open	361 (18.3)	661 (36.5)	1,022 (26.5)
Laparoscopy or robotic	1,611 (81.7)	1,151 (63.5)	2,762 (73.5)