Table 2.
Participant characteristics of the total study population
(Median values and interquartile ranges; numbers and percentages)
| n 195 | % | |
|---|---|---|
| Female | 117 | 60 |
| Age: years | ||
| Median | 47 | |
| IQR | 32–57 | |
| BMI: kg/m2 | ||
| Median | 25 | |
| IQR | 22–28 | |
| Level of education* | ||
| Low | 41 | 21 |
| Intermediate | 71 | 36 |
| High | 83 | 44 |
| Currently smoking | 17 | 8·7 |
| Diagnosis | ||
| CD | 97 | 50 |
| UC | 89 | 46 |
| IBD-U | 9 | 4·6 |
| Disease duration: years | ||
| Median | 10 | |
| IQR | 3·6–18 | |
| Age at diagnosis CD | ||
| A1 ≤ 16 years | 9 | 9·3 |
| A2 17–40 years | 62 | 64 |
| A3 > 40 years | 26 | 27 |
| Disease localisation CD | ||
| L1 Terminal ileum | 25 | 26 |
| L2 Colon | 23 | 24 |
| L3 Ileocolon | 48 | 49 |
| L4 Upper gastrointestinal | 1 | 1·0 |
| Disease behaviour CD | ||
| B1 Non-structuring, non-penetrating | 65 | 67 |
| B2 Structuring, non-penetrating | 25 | 26 |
| B3 Structuring, penetrating | 7 | 7·2 |
| Perianal disease CD | 19 | 20 |
| Disease extent UC and IBD-U | ||
| E1 Ulcerative proctitis | 11 | 11 |
| E2 Left-sided distal colitis | 38 | 39 |
| E3 Extensive pancolitis | 49 | 50 |
| Extra-intestinal manifestations | 33 | 17 |
| IBD medication currently used† | ||
| None | 44 | 23 |
| 5-aminosalicylic acid | 71 | 36 |
| Steroids | 19 | 10 |
| Immunomodulators | 52 | 27 |
| Biologics | 58 | 30 |
| Highest step-up in IBD medication | ||
| 5-aminosalicylic acid | 22 | 11 |
| Steroids | 31 | 16 |
| Immunomodulators | 58 | 30 |
| Biologics | 83 | 43 |
| Prior IBD-related surgery | 34 | 17 |
| Clinical disease activity‡ | ||
| Remission | 140 | 72 |
| Active disease | 55 | 28 |
| Dietary restrictions† | 53 | 27 |
| Vegetarian or limited meat intake | 20 | 10 |
| Gluten-free or limited gluten intake | 5 | 2·6 |
| Lactose-free or limited lactose intake | 14 | 7·2 |
| Low in carbohydrates | 5 | 2·6 |
| Other | 16 | 8·2 |
IBD, inflammatory bowel disease; CD, Crohn’s disease; UC, ulcerative colitis; IBD-U, inflammatory bowel disease-unclassified.
*
Level of education: no education, primary or lower vocational education and lower general secondary education (low); secondary vocational education and higher general secondary education (intermediate); higher vocational education and university (high).
†
Multiple options possible per participant.
‡
Defined by Patient Harvey Bradshaw Index ≤ 4 or Patient Simple Clinical Colitis Activity Index ≤ 2 and expressed as number (%).
Values expressed as number (%), unless stated otherwise.