Baseline characteristics of study participants by IBD diagnosis
| No IBD n=236 854 | CD N=938 | UC n=1799 | |
|---|---|---|---|
| n (%) | n (%) | n (%) | |
| Stress resilience | |||
| Low | 50 317 (24.0) | 225 (23.5) | 423 (21.3) |
| Moderate | 129 457 (58.3) | 547 (55.1) | 990 (54.7) |
| High | 57 080 (17.7) | 166 (21.4) | 386 (24.1) |
| Mean (SD) | 5.1 (1.9) | 4.8 (1.8) | 4.9 (1.9) |
| BMI | |||
| Mean (SD) (kg/m2) | 21.2 (2.6) | 21.0 (2.6) | 21.0 (2.5) |
| ESR in adolescence | |||
| Mean (SD) (mm/hour) | 3.4 (3.5) | 5.1 (5.9) | 3.9 (4.2) |
| Median (range) | 2 (1–89) | 3 (1–51) | 3 (1–55) |
| Height | |||
| Mean (SD) (cm) | 178.7 (6.4) | 178.1 (6.4) | 178.1 (6.5) |
| Parental SEI in 1960 | |||
| Manual worker | 96 493 (40.7) | 423 (45.1) | 766 (42.6) |
| Agricultural workers | 9 046 (3.8) | 52 (5.5) | 65 (3.6) |
| Farm owner/managers | 23 396 (9.9) | 65 (6.9) | 169 (9.4) |
| Office workers | 65 495 (27.7) | 230 (24.5) | 468 (26) |
| Business owners/managers | 25 267 (10.7) | 98 (10.5) | 182 (10.1) |
| Others (unknown) | 17 157 (7.2) | 70 (7.5) | 149 (8.3) |
| Appendicitis <20 years | |||
| No | 234 935 (99.2) | 933 (99.5) | 1 796 (99.8) |
| Yes | 1 919 (0.8) | 5 (0.5) | 3 (0.2) |
| Age at diagnosis (years) | |||
| Median (range) | 40 (21–57) | 47 (22–57) | |
BMI, body mass index; CD, Crohn's disease; ESR, erythrocyte sedimentation rate; IBD, inflammatory bowel disease; n, number; SEI, socioeconomic index; UC, ulcerative colitis.