Table 2.

Baseline characteristics of CD patients for each of the six patterns of disease activity.

	Active to remission [n = 110]	Remission to active [n = 14]	Chronic continuous [n = 25]	Moderate-severe chronic intermittent [n = 120]	Mild chronic intermittent [n = 41]	Quiescent [n = 122]
Age at diagnosis, mean [SD]	34.5 [13.7]	32.5 [8.6]	29.0 [12.3]	30.8 [11.3]	35.8 [15.0]	37.6 [14.9]
Male, n [%]	38 [34.5]	10 [71.4]	9 [36.0]	37 [30.8]	13 [31.7]	46 [37.7]
Era of diagnosis, n [%]
1991–1998	54 [49.1]	11 [78.6]	14 [56.0]	61 [50.8]	17 [41.5]	86 [70.5]
1999–2005	56 [50.9]	3 [21.4]	11 [44.0]	59 [49.2]	24 [58.5]	36 [29.5]
Smoking at diagnosis, n [%]	60 [54.5]	9 [64.3]	15 [60.0]	73 [60.8]	19 [46.3]	43 [35.2]
	NA: 8 [7.3]	NA: 0 [0.0]	NA: 0 [0.0]	NA: 7 [5.8]	NA: 3 [7.3]	NA: 20 [16.4]
Disease location at diagnosis, n [%]
L1	46 [41.8]	10 [71.4]	12 [48.0]	46 [38.7]	21 [51.2]	75 [61.5]
L2	37 [33.6]	1 [7.1]	8 [32.0]	35 [29.4]	14 [34.1]	32 [26.2]
L3	27 [24.5]	2 [14.3]	5 [20.0]	38 [31.7]	6 [14.6]	14 [11.5]
L4	0 [0]	1 [7.1]	0 [0.0]	1 [0.8]	0 [0]	1 [0.8]
Concomitant upper GI disease at diagnosis, n [%]	13 [11.8]	3 [21.4]	1 [4.0]	10 [8.3]	7 [17.1]	5 [4.1]
Disease behaviour at diagnosis, n [%]
B1	76 [69.1]	10 [71.4]	20 [80.0]	93 [77.5]	30 [73.2]	96 [78.7]
B2	17 [15.5]	1 [7.1]	4 [16.0]	21 [17.5]	6 [14.6]	18 [14.8]
B3	17 [15.5]	3 [21.4]	1 [4.0]	6 [5.0]	5 [12.2]	8 [6.6]
Perianal disease at diagnosis, n [%]	13 [11.8]	2 [14.3]	2 [8.0]	11 [9.2]	6 [14.6]	9 [7.4]
Surgery at diagnosis, n [%]	8 [7.3]	3 [21.4]	2 [8.0]	6 [5.0]	2 [4.9]	29 [23.8]

Phenotype according to Montreal classification. Disease location of CD was defined as ileal involvement [L1], exclusive colonic involvement [L2], ileocolonic involvement [L3], or isolated upper gastrointestinal disease [L4]. Disease behaviour of CD was defined as non-stricturing/non-penetrating [B1], stricturing [B2], or penetrating [B3].

CD, Crohn’s disease; GI, gastrointestinal; n, number of patients; SD, standard deviation; NA, not available.