Patient Phenotype According to Montreal Classification Scheme.

*Statistical analysis excludes black patients.†Adjusted for gender, smoking and duration of symptom onset.‡Adjusted for gender, smoking, age of onset and duration of symptom onset.§Adjusted for gender, smoking, disease duration and age of onset (as appropriate).aAge at study enrolment; data missing for 1 Cape Coloured subject.bDisease location was not confirmed by upper endoscopy, ileocolonoscopy or small bowel imaging for 2 Cape Coloured subject at diagnosis and 1 Cape Coloured subject at study enrolment. Overall, no subjects had upper gastrointestinal diseasec“p” is the perianal modifier added to B1–B3 when concomitant perianal disease is present.