Table 1.

Characteristics of Eligible Subjects (n=6169)

	n (%)
Male (%)	3086 (50%)
Ancestry/Race (%)
Western European	4358 (70.6%)
Eastern European	413 (6.7%)
Ashkenazi	270 (4.4%)
Asian	151 (2. 5%)
African American	382 (6.2%)
Latin   American/C aribbean	385 (6.2%)
Native American	69 (1.1%)
Near/Middle Eastern	48 (0.8%)
Other	93 (1.5%)
Age at first colorectal adenoma diagnosis (mean±SE)	45±.2
Adenoma count, No. (%)
0	933 (15.1%)
<10	871 (14.1%)
10–19	726 (11.8%)
20–99	2477 (40.2%)
100–999	1066 (17.3%)
≥1000	96 (1.6%)
Age at CRC diagnosis (mean±SE)	46.5±.4
History of CRC (%)
CRC and adenoma	1292 (20.9%)
CRC alone	368 (6.0%)
CRC (total)	1660 (27%)
First-degree relative with CRC (%)	1929 (31.3%)

Abbreviations: CRC, colorectal cancer