Prediction of overall survival following colorectal cancer surgery in elderly patients

Table 1 Patient, surgery, and disease characteristics

Variable	SGH cohort (n = 1267)
Age, median (range), yr	77 (70-102)
Gender
Male	658 (51.9)
Female	609 (48.1)
Race
Chinese	1148 (90.6)
Malay	50 (4.0)
Indian	30 (2.4)
Others	39 (3.1)
ECOG status
0 (asymptomatic)	751 (59.3)
1	401 (31.6)
2	85 (6.7)
3	23 (1.8)
4 (bedbound)	7 (0.2)
ASA score
1	178 (14.0)
2	857 (67.6)
3	225 (17.8)
4	7 (0.6)
Tumor site
Colon	790 (62.3)
Rectum	477 (37.6)
Surgical approach
Open	888 (70.1)
Laparoscopic	379 (29.9)
Surgery
High Anterior resection	505 (40.0)
Low Anterior resection	163 (12.9)
Ultra-Low Anterior resection	150 (11.8)
Right Hemicolectomy	286 (22.6)
Abdominoperineal resection	58 (4.6)
Others	105 (8.3)
TMN stagea
1	240 (18.9)
2	416 (32.8)
3	442 (34.9)
Tumor diameter, median (IQR), cm	4.5 (3–6)
Number of lymph nodes harvested, median (IQR)	15 (11–20)
Neoadjuvant therapy	22 (1.8)
Adjuvant therapy	219 (17.6)

^aAmerican Joint Committee on Cancer Staging, 7^th edition. All values are reported as n (%) unless otherwise stated. ECOG: Eastern Cooperative Oncology Group; ASA: American Society of Anesthesiologists; IQR: Interquartile range; SGH: Singapore General Hospital.