Table 1

Demographics of study population (n=987)

CharacteristicValues
Male sex (n, %)559 (56.6)
Age at UC diagnosis (median, IQR)30 years (22–40)
Duration of UC at study end point (median, IQR)29 years (21–38)
Extensive UC (n, %)987 (100)
Primary sclerosing cholangitis (n, %)42 (4.3)
Follow-up duration (median, IQR)13 years (9–18)
Colonoscopy (median, IQR)6 per patient (4–9)
Surveillance interval (median, IQR)22 months (12–28)
Chromoendoscopy (n, %)1056 (15.1%)
Biopsies (median, IQR)9 (6–10)