Table 2.

Patient characteristics and Paris classification for paediatric inflammatory bowel disease.

	VEO-IBD [n = 57]	Older onset IBD [n = 58]
Male, n [%]	40 [70]	40 [69]
Age at diagnosis, median, yr [IQR]	2.2 [1.3, 3.4]	13.0 [9.5, 13.6]
A1a 0–<10 yr, n	57	5
A1b 10–<17 yr, n	0	53
IBD subtype, n [%]
Crohn’s disease	39 [68]	44 [76]
IBD-unclassified	16 [28]	5 [9]
Ulcerative colitis	2 [4]	9 [15]
Ulcerative colitis/IBD-U extent of disease
E1: Ulcerative proctitis	0 [0]	1 [7]
E2: Left-sided colitis	6 [33]	0
E3: Extensive	3 [17]	1 [7]
E4: Pancolitis	9 [50]	12 [86]
Crohn’s disease characteristics
Lower GI involvement, n [%]
L1: Distal 1/3 Ileum/limited caecal disease	0 [0]	4 [9]
L2: Colonic only	24 [49]	8 [18]
L3: Ileocolonic	7 [44]	19 [43]
None	3 [8]	0 [0]
Upper GI involvement, n [%]
L4a: Upper disease proximal to ligament of Treitz [LOT]	19 [49]	11 [25]
L4b: Upper disease distal to LOT and proximal to distal 1/3 ileum	5 [13]	19 [43]
Behaviour phenotype, n [%]
B1: Non-stricturing, non-penetrating	31 [80]	31[70]
B2: Stricturing	4 [10]	7 [16]
B3: Penetrating	4 [10]	4 [9]
B4: Both Stricturing and penetrating	0 [0]	2 [5]
Perianal involvement, n [%]	14 [36]	5 [11]

VEO-IBD, very early onset inflammatory bowel disease; yr, years; IQR, interquartile range.