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. Author manuscript; available in PMC: 2011 Aug 1.
Published in final edited form as: Clin Gastroenterol Hepatol. 2010 Apr 2;8(8):682–687.e1. doi: 10.1016/j.cgh.2010.03.022

Table 1.

Demographics and patient characteristics.

Early-onset Late-onset P-value
Number of patients 155 140
Gender (M:F) 85:70 70:70
Mean age (yrs) 23.8±0.2 60.2±0.7
 Range (yrs) 18-30 50-87
Ethnicity
 Caucasian 133 (85.8%) 126 (90.0%) 0.27
 African-American 18 (11.6%) 12 (8.6%) 0.39
 Other 4 (2.6%) 2 (1.4%) 0.48
Smoking history
 Current 12 (7.7%) 4 (2.9%) 0.06
 Never 122 (78.7%) 63 (45.3%) <0.001*
 Former 21 (13.5%) 72 (51.8%) <0.001*
Family history of IBD 33 (21.3%) 14 (10.7%) 0.008*