Perioperative characteristics and outcomes of colorectal cancer in elderly patients

Table 1 Characteristics and age groups of the participants, n (%)

Characteristics	65-69 years	70-74 years	75-79 years	80-84 years	85-89 years	χ2 (df)	P value
Gender
Female	17 (40.5)	10 (23.8)	8 (19.0)	4 (9.5)	3 (7.1)	4.31 (4)	0.382
Male	27 (48.2)	18 (32.1)	8 (14.3)	2 (3.6)	1 (1.8)
Ethnicity
Malay	39 (48.1)	22 (27.2)	12 (14.8)	5 (6.2)	3 (3.7)	4.52 (8)	0.724
Chinese	5 (31.3)	5 (31.3)	4 (25.0)	1 (6.3)	1 (6.3)
Others	0 (0)	1 (100)	0 (0)	0 (0)	0 (0)
BMI
Underweight	2 (22.2)	3 (33.3)	1 (11.1)	3 (33.3)	0 (0)	25.43 (12)	0.023a
Normal	28 (45.9)	15 (24.6)	12 (19.7)	2 (3.3)	4 (6.6)
Overweight	14 (56.0)	9 (36.0)	2 (8.0)	0 (0)	0 (0)
Obese	0 (0)	1 (33.3)	1 (33.3)	0 (0)	0 (0)
CEA (ng/mL)	73.89 ± 174.25	329.25 ± 1318.30	63.18 ± 136.3	17.17 ± 16.64	4.63 ± 2.14	-	0.603
CKD
No	41 (45.6)	26 (28.9)	14 (15.6)	6 (6.7)	3 (3.3)	2.59 (4)	0.632
Yes	3 (37.5)	2 (25.0)	2 (25.0)	0 (0)	1 (12.5)
Hypertension
No	17 (54.8)	9 (29.0)	3 (9.7)	1 (3.2)	1 (3.2)	2.93 (4)	0.598
Yes	27 (40.3)	19 (28.4)	13 (19.4)	5 (7.5)	3 (4.5)
Hyperlipidaemia
No	35 (47.3)	22 (29.7)	10 (13.5)	5 (6.8)	2 (2.7)	3.60 (4)	0.49
Yes	9 (37.5)	6 (25.0)	6 (25.0)	1 (4.2)	2 (8.3)
Ischaemic heart disease
No	37 (44.0)	23 (27.4)	14 (16.7)	6 (7.1)	4 (4.8)	2.10 (4)	0.753
Yes	7 (50.0)	5 (35.7)	2 (14.3)	0 (0)	0 (0)
ASA classification
Grade 1	5 (50.0)	4 (40.0)	1 (10.0)	0 (0)	0 (0)	21.50 (16)	0.186
Grade 2	29 (50.9)	16 (28.1)	6 (10.5)	4 (7.0)	2 (3.5)
Grade 3	8 (29.6)	8 (29.6)	8 (29.6)	2 (7.4)	1 (3.7)
Grade 4	1 (50.0)	0 (0)	0 (0)	0 (0)	1 (50.0)
Grade 5	1 (50.0)	0 (0)	1 (50.0)	0 (0)	0 (0)
Tumour location
Left sided	22 (40.7)	17 (31.5)	9 (16.7)	3 (5.6)	3 (5.6)	17.74 (20)	0.605
Low rectum	9 (56.3)	4 (25.0)	3 (18.8)	0 (0)	0 (0)
Mid rectum	5 (83.3)	1 (16.7)	0 (0)	0 (0)	0 (0)
Multiple	2 (66.7)	1 (33.3)	0 (0)	0 (0)	0 (0)
Right sided	6 (37.5)	3 (18.8)	4 (25.0)	2 (12.5)	1 (6.3)
Upper rectum	0 (0)	2 (66.7)	0 (0)	0 (0)	0 (0)
Adjuvant
No	37 (45.1)	21 (25.6)	14 (17.1)	6 (7.3)	4 (4.9)	15.18 (16)	0.418
Chemoradiotherapy	2 (100)	0 (0)	0 (0)	0 (0)	0 (0)
Chemotherapy	1 (100)	0 (0)	0 (0)	0 (0)	0 (0)
Concurrent chemotherapy	4 (33.3)	7 (58.3)	1 (8.3)	0 (0)	0 (0)
Radiotherapy	0 (0)	0 (0)	1 (100)	0	0 (0)

^aP < 0.05.

BMI: Body mass index; CEA: Carcinoembryonic antigen; CKD: Chronic kidney disease; ASA: American Society of Anesthesiologists.