Table 1. Demographic characteristics of the IBD study population.

	Crohn's diseasen = 812	Ulcerative colitisn = 442	Controlsn = 1446
GenderMale (%)Female (%)	49.051.0	48.151.9	63.136.9
Age (yrs)Mean ± SDRange	39.4±13.210-80	41.7±14.67–85	46.1±10.618–71
Body mass indexMean ± SDRange	23.1±4.113–40	23.9±4.215–41
Age at diagnosis (yrs)Mean ± SDRange	27.5±11.57–71	32.1±13.59–81
Disease duration (yrs)Mean ± SDRange	12.2±8.50–44	11.0±7.81–40
Positive family history of IBD (%)	16.2	16.1