Table 1.

Baseline characteristics

UC patients	Pediatric diagnosis (<18 years old)	Adult diagnosis (≥18 years old)	p value
Patients, n (%)	184 (17.9)	846 (82.1)	−
Gender, n (%)
Male	84 (45.7)	454 (53.7)	0.049
Female	100 (54.3)	392 (46.3)
Age at diagnosis (median, IQR, range)	14.1, 10.2–15.9, 2.3–17.9	31.8, 25.1–40.8, 18.0–79.6	<0.001
Age at enrollment (median, IQR, range)	16.6, 13.3–24.9, 3.9–54.1	41.4, 32.5–51.8, 18.4–84	<0.001
Disease duration at enrollment (median, IQR, range), yr	2.9, 0.9–11.0, 0.2–39.2	5.4, 1.8–12.4, 0–50.3	0.001
Age at latest follow-up (median, IQR, range)	21.6, 16.4–30, 5.5–62.1	48, 38.3–58.4, 19.6–86.2	<0.001
Disease duration at latest follow-up (median, IQR, range), yr	9.6, 4.2–17.1, 0.3–44.3	12.4, 7.4–19.2, 0.1–54.3	<0.001
Diagnostic delay (median, IQR, range), months	4, 2–7.5, 1–168	3, 2–10, 0–360	0.873
Diagnostic delay categorization, n (%)
Short delay (≤75th percentile)	138 (75)	635 (75.1)	0.987
Long delay (>75th percentile)	46 (25)	211 (24.9)
Disease location at diagnosis
E1 (proctitis), n (%)	16 (9.7)	193 (25)	<0.001
E2 (left-sided), n (%)	41 (24.8)	280 (36.3)
E3 (pancolitis), n (%)	108 (65.5)	299 (38.7)
Unknown/unclear	19	74
Disease location at enrollment
E1 (proctitis), n (%)	13 (7.3)	151 (18.2)	<0.001
E2 (left-sided), n (%)	51 (28.7)	329 (39.7)
E3 (pancolitis), n (%)	114 (64)	349 (42.1)
Unknown/unclear	6	17
Disease location at latest follow-up
E1 (proctitis), n (%)	20 (11)	185 (22.1)	<0.001
E2 (left-sided), n (%)	46 (25.3)	336 (40.1)
E3 (pancolitis), n (%)	116 (63.7)	316 (37.8)
Unknown/unclear	2	9
Smoking status
Smoking at enrollment, n (%)
Yes	20 (10.9)	145 (17.1)	0.036
No	164 (89.1)	701 (82.9)
Smoking at last visit
Yes, n (%)	17 (9.9)	97 (12.9)	0.286
No, n (%)	154 (90.1)	654 (87.1)
Missing	13	95
Ever smoked, n (%)
Yes	32 (17.4)	285 (33.7)	<0.001
No	152 (82.6)	561 (66.3)