Table 1. Demographic characteristics of the IBD study population.

	Crohn's disease	Ulcerative colitis	Controls
	n = 905	n = 318	n = 908
Gender
Male (%)	48.8	52.2	62.7
Female (%)	51.2	47.8	37.3
Age (yrs)
Mean ± SD	40.9±13.3	44.2±14.8	45.8±10.3
Range	15–83	17–88	19–68
Body mass index
Mean ± SD	23.0±4.2	23.9±4.5
Range	13–41	15–54
Age at diagnosis (yrs)
Mean ± SD	26.1±12.4	28.9±14.5
Range	1–78	2–81
Disease duration (yrs)
Mean ± SD	13.4±8.9	12.2±8.3
Range	0–47	1–50
Positive family history of IBD (%)	16.7	17.4