Impact of severe postoperative complications on the prognosis of older patients with colorectal cancer: a two-center retrospective study

Table 1 Patient characteristics

Variables		Total patients (n = 760)
Age, years		71.9	± 10.2
Sex	Female Male	331 429	(44%) (56%)
BMI, kg/m²		22.2	± 3.56
ASA-PS	4 3 2 1	6 147 516 91	(1%) (19%) (68%) (12%)
Treatment for colorectal obstruction	Presence Absence	48 712	(6%) (94%)
Location	Right Left Rectum	273 236 251	(36%) (31%) (33%)
Preoperative treatment (chemo-radio or chemo therapy)	Presence Absence	11 749	(1%) (99%)
Histopathological type^a	por/sig/muc tub/pap	62 698	(8%) (92%)
T stage^b	T4 T3 T2 T1	138 377 115 130	(18%) (50%) (15%) (17%)
N stage^b	N2 N1 N0	85 199 476	(11%) (26%) (63%)
pStage^b	3 2 1	284 273 203	(37%) (36%) (27%)
Lymphatic invasion	Presence Absence	483 277	(64%) (36%)
Venous invasion	Presence Absence	420 340	(55%) (45%)
Surgical approach	Open Laparoscopic	226 534	(30%) (70%)
Operative blood loss, ml		139	± 281
Operative time, min		269	± 109
Severe postoperative complication^c	Presence Absence	56 704	(7%) (93%)
Adjuvant chemotherapy	Presence Absence	230 530	(30%) (70%)

a: According to the Japanese classification of colorectal carcinoma, 8th edition
b: According to the 7th edition of the UICC/TNM staging system
c: Grade 3 or higher according to the Clavien–Dindo classification
tub tubular adenocarcinoma, pap papillary adenocarcinoma, por poorly differentiated adenocarcinoma,
sig signet-ring cell carcinoma, muc mucinous adenocarcinoma, ASA-PS American Society of Anesthesiologists Physical Status, BMI body mass index

ISSN: 1471-230X