Table 1. Baseline patient and procedure characteristics for 2,400 patients who had colonoscopy.

Characteristic	No dysplasia (n=1,489)	Dysplasia (n=911)	P-value
Mean age (s.d.), years	61 (+13)	65.5 (+11)	<0.0001
Median polyp size (IQR), mm	5 (3–5)	5 (4–10)	<0.0001
Female	839 (56%)	374 (41%)	<0.0001
History of aspirin use	569 (38%)	342 (38%)	NS
Patient race
White	1,288 (87%)	796 (87%)	NS
Black	110 (7%)	52 (6%)	NS
Hispanic	45 (3%)	36 (4%)	NS
Other	46 (3%)	27 (3%)	NS

IQR, interquartile range; NS, non-significant.