Table 1.

Characteristics of CD and UC Patients and Controls

	CD patients	CD controls	UC patients	UC controls
Mean age (s.d.)	42 (13)	42 (13)	45 (12)	45 (12)
Age
< 20 n (%)	737 (8.1)	2066 (8.3)	488 (4.7)	1394 (5.0)
20–39 n (%)	2755 (30.4)	7510 (30.3)	2661 (25.7)	1760 (25.4)
40–64 n (%)	5564 (61.4)	15253 (61.4)	7215 (69.6)	19606 (69.6)
Gender
Female n (%)	5090 (56.2)	13965 (56.2)	5464 (52.7)	14828 (52.7)
Male n (%)	3966 (43.8)	10864 (43.8)	4900 (47.3)	13332 (47.3)
Region
Northast n (%)	2124 (23.5)	5818 (23.4)	2402 (23.2)	6567 (23.3)
Midwest n (%)	2114 (23.3)	5903 (23.8)	2276 (22.0)	6339 (22.5)
West n (%)	1859 (20.5)	4930 (19.9)	2367 (22.8)	6190 (22.0)
South n (%)	2959 (32.7)	8178 (32.9)	3319 (32.0)	9064 (32.2)
Total	9056	24829	10364	28160