Table 1.
Baseline characteristics of colorectal cancer (CRC) cases by age group
| Characteristic | Class | Age at CRC diagnosis | |||
|---|---|---|---|---|---|
| Overall N | <60 years | 60–74 years | 75+ years | ||
| Age | N | 1280 | 224 | 756 | 300 |
| Mean | 54.8 | 68.1 | 79.4 | ||
| SD | 4.1 | 4.1 | 3.5 | ||
| Gender | Female | 690 | 156 (70%) | 430 (57%) | 104 (35%) |
| Male | 590 | 68 (30%) | 326 (43%) | 196 (65%) | |
| Race | White | 1214 | 218 (97%) | 715 (95%) | 281 (94%) |
| Black | 20 | 2 (0.9%) | 13 (2%) | 5 (2%) | |
| Asian | 9 | 2 (0.9%) | 5 (0.7%) | 2 (0.7%) | |
| Year of diagnosis | Before 2002 | 986 | 214 (96%) | 610 (81%) | 162 (54%) |
| 2002 or later | 294 | 10 (5%) | 146 (19%) | 138 (46%) | |
| BMI (kg/m2) | <30 | 1098 | 192 (86%) | 626 (83%) | 280 (93%) |
| 30+ | 154 | 29 (13%) | 108 (14%) | 17 (6%) | |
| Tumor location | Proximal colon | 603 | 80 (36%) | 367 (49%) | 156 (52%) |
| Distal colon | 389 | 76 (34%) | 242 (32%) | 71 (24%) | |
| Rectum | 282 | 66 (30%) | 147 (19%) | 69 (23%) | |
| Disease stage | I | 297 | 48 (21%) | 173 (23%) | 76 (25%) |
| II | 375 | 52 (23%) | 238 (32%) | 85 (28%) | |
| III | 329 | 70 (31%) | 185 (25%) | 74 (25%) | |
| IV | 161 | 35 (16%) | 103 (14%) | 23 (8%) | |
| Tumor differentiation | Well/moderate | 1144 | 201 (90%) | 667 (88%) | 276 (92%) |
| Poor | 125 | 21 (9%) | 81 (11%) | 23 (8%) | |
| No. of lymph node examined | <12 | 556 | 103 (46%) | 345 (46%) | 108 (36%) |
| 12+ | 596 | 101 (45%) | 338 (45%) | 157 (52%) | |
| No. of lymph node positive for metastasis | 0 | 713 | 119 (53%) | 429 (57%) | 165 (55%) |
| 1–3 | 248 | 47 (21%) | 150 (20%) | 51 (17%) | |
| 4+ | 249 | 53 (24%) | 136 (18%) | 60 (20%) | |
| Comorbid conditions | Diabetes mellitus | 122 | 9 (4%) | 70 (9%) | 43 (14%) |
| Myocardial Infarction (MI) | 83 | 1 (0.4%) | 47 (6%) | 35 (12%) | |
| CVA | 90 | 1 (0.4%) | 39 (5%) | 50 (17%) | |
| COPD | 57 | 3 (1%) | 35 (5%) | 19 (6%) | |
| CHF | 82 | 2 (0.9%) | 39 (5%) | 41 (14%) | |
| MI/CHF | 125 | 2 (0.9%) | 67 (9%) | 56 (19%) | |
Abbreviations: BMI, body mass index; No., number; CHF, congestive heart failure; COPD, chronic obstructive pulmonary disease; CRC, colorectal cancer; CVA, cerebrovascular accident; MI, myocardial infarction; SD, standard deviation.