Table 1.

Clinicopathologic features of the subjects in this study

Training setTest setTotal
(N = 355)(N = 153)(N = 508)
Demographics
 Median age, y (range)61 (28–93)61 (33–89)61 (28–93)
 Male235108343
 Female12045165
Colorectal cancer
 Total N391756
 Location (right/left/rectum)13/11/157/7/320/18/18
 Median size, cm (range)4.5 (0.7–11.5)4.8 (1.5–9.3)4.6 (0.7–11.5)
 Dukes stage (A/B/C/D)9/16/11/34/8/4/113/24/15/4
Advanced adenomaa
 Total N312253
 Location (right/left/rectum)16/12/314/7/130/19/4
 Median size, cm (range)1.7 (0.6–4.0)1.3 (0.6–2.6)1.5 (0.6–4.0)
Minor polypb
 Total N13574209
 Location (right/left/rectum)80/46/947/17/9128/63/18
 Median size, cm (range)0.5 (0.1–0.9)0.5 (0.2–0.9)0.5 (0.1–0.9)
Normal colon
 Total N15040190
  • aAdvanced adenomas were defined as adenomas 1 cm or greater in diameter, and/or containing villous components, and/or with high-grade dysplasia.

  • bMinor polyps were defined as adenomas other than advanced adenomas.