Table 1.

NHANES Inflammatory Bowel Disease Sample Demographics.

NHANES 1976–80: Ulcerative Colitis	N	Cases	Prevalence (95 %CI)
All Ages (20 to 74) Years)	15,357	171	1.0 (0.8,1.2)
Ages 20 to 69 Years	13,730	144	1.0 (0.8,1.2)
Age 20 to 49 Years	7,439	46	0.7 (0.5,0.9)
Age 50 to 69 Years	6,291	98	1.6 (1.2,1.9)
Women	7,348	106	1.5 (1.2,1.9)
Men	6,382	38	0.5 (0.2,0.7)
White	11,874	140	1.1
Black	1,589	4	0.5*
NHANES 2009–2010: All IBD (20 to 69 Years)	5,105	62	1.2 (0.8,1.6)
Age 20 to 49 years	3,190	23	0.9 (0.5,1.3)
Age 50 to 69 years	1,915	39	1.8 (0.9,2.7)
Women	2,631	39	1.3 (0.7,2.0)
Men	2,474	23	1.1 (0.5,1.6)
Mexican American	1,025	17	1.6 (0.9,2.3)
Non-Hispanic-White	2,245	29	1.4 (0.9,1.9)
Non-Hispanic Black	963	7	0.8*
Ulcerative Colitis	5,096	53	1.0 (0.5,1.4)
Age 20- to 49 years	3,185	18	0.7 (0.3,1.1)
Age 50 to 69 years	1,911	35	1.4 (0.6,2.3)
Women	2,629	34	1.0 (0.4,1.6)
Men	2,469	19	0.9 (0.4,1.4)
Mexican American	1,023	15	1.4 (0.9,1.9)
Non-Hispanic White	2,243	23	1.1 (0.5,1.6)
Non-Hispanic Black	962	6	0.7*
Crohn's Disease	5,091	11	0.3 (0.1,0.4)

Abbreviations: IBD = Inflammatory Bowel Disease; N = Total Sample; CI = Confidence Interval. *Variance estimate not statistically reliable. Notes: For race/ethnicity, only the data for the 3 major US race/ethnic groups are shown; NHANES II had less detailed race/ethnicity data; 2 individuals reported both UC and Crohn's Disease.