TABLE 1.
Characteristics of Incident Cases in Different Age Cohorts
| Entire Cohort (n = 60,247) | Pediatric Cohort (0–17 y) (n = 845) | Young Adult Cohort (18–25 y) (n = 2853) | Adult Cohort (26–59 y) (n = 27,420) | Elderly Cohort (>60 y) (n = 29,129) | P | |
|---|---|---|---|---|---|---|
| Mean age at diagnosis, y | 57.1 | 14.1 | 22.1 | 44.7 | 73.3 | <0.001 |
| Sex, female, No. (%) | 32,830 (54.5) | 399 (47.2) | 1325 (46.4) | 14,270 (52.0) | 16,836 (57.8) | <0.001 |
| Race, No. (%) | ||||||
| White | 44,736 (74.3) | 634 (75.0) | 2168 (76.0) | 20,065 (73.2) | 21,869 (75.1) | 0.002 |
| Black or African American | 4695 (7.8) | 47 (5.6) | 216 (7.6) | 2166 (7.9) | 2266 (7.8) | |
| Hispanic or Latino | 4313 (7.2) | 78 (9.2) | 231 (8.1) | 2295 (8.4) | 1709 (5.9) | |
| Asian | 1580 (2.6) | 31 (3.7) | 60 (2.1) | 957 (3.5) | 532 (1.8) | |
| Unknown | 4923 (8.2) | 55 (6.5) | 178 (6.2) | 1937 (7.1) | 2753 (9.5) | |
| Geographic region, No. (%) | ||||||
| Northeast | 7896 (13.1) | 134 (15.9) | 358 (12.6) | 3540 (12.9) | 3864 (13.3) | <0.001 |
| Midwest | 13,721 (22.8) | 227 (26.9) | 767 (26.9) | 6580 (24.0) | 6147 (21.1) | |
| South | 26,092 (43.3) | 346 (41.0) | 1241 (43.5) | 12,418 (45.3) | 12,087 (41.5) | |
| West | 12,096 (20.1) | 137 (16.2) | 474 (16.6) | 4824 (17.6) | 6661 (22.9) | |
| Unknown | 442 (0.7) | 1 (0.1) | 13 (0.5) | 58 (0.2) | 370 (1.3) | |
| Disease type | ||||||
| Ulcerative colitis, No. (%) | 33,517 (55.6) | 291 (34.4) | 1070 (37.5) | 14,325 (52.2) | 17,831 (61.2) | <0.001 |
| Crohn’s disease, No. (%) | 22,750 (37.8) | 506 (59.9) | 1597 (56.0) | 11,097 (40.5) | 9550 (32.8) | |
| Inflammatory bowel disease unclassified, No. (%) | 3980 (6.6) | 48 (5.7) | 186 (6.5) | 1998 (7.3) | 1748 (6.0) | |
| Charlson comorbidity index, mean, median | 2.4, 1.0 | 0.7, 0 | 0.6, 0 | 1.1, 0 | 3.9, 3 | <0.001 |