Table 1.
Baseline characteristics of the patient cohort.
| Characteristics | n (%) * |
|---|---|
| Sex | |
| Women | 910 (41.2) |
| Men | 1296 (58.8) |
| Age at diagnosis | |
| [33, 65) years | 717 (32.5) |
| [65, 75) years | 776 (35.2) |
| [75, 96) years | 713 (32.3) |
| Tumor stage | |
| I | 400 (18.2) |
| II | 759 (34.6) |
| III | 726 (33.1) |
| IV | 309 (14.1) |
| Tumor subsite | |
| Distal colon † | 738 (33.5) |
| Proximal colon ‡ | 796 (36.1) |
| Rectum | 669 (30.4) |
| Body mass index at diagnosis | |
| <25 kg/m2 | 834 (38.0) |
| 25–30 kg/m2 | 932 (42.4) |
| >30 kg/m2 | 430 (19.6) |
| Smoking status | |
| Never | 907 (41.1) |
| Former | 947 (43.0) |
| Current | 350 (15.9) |
| Charlson comorbidity index | |
| 0 (no comorbidity) | 1281 (58.1) |
| 1 (mild comorbidity) | 479 (21.7) |
| 2+ (moderate comorbidity) | 446 (20.2) |
Note: * 12 missing values for tumor stage, 10 missing values for body mass index, 2 missing values for smoking status and 3 missing values for tumor subsite. Complete case analysis was applied when adjusting for the variables with missing values. † The distal colon includes the descending colon and the sigmoid colon. ‡ The proximal colon includes the cecum, the ascending colon, the right flexure, and the transverse colon and the left flexure.