Table 1

Characteristics of the study participants by randomization arm

ChromoendoscopyIntensive colonoscopy
No. patients2723
Mean age (y)57.659.3
Female14 (52%)7 (30%)
Non-White10
Personal history of CRC2 (7%)3 (13%)
Family history of CRC9 (33.3%)5 (22%)
No. polyps on previous colonoscopies
 1–213 (48%)12 (52%)
 3–54 (15%)3 (13%)
 >56 (22%)5 (22%)
No. previous colonoscopies
 17 (26%)7 (30.5%)
 26 (22%)4 (17.5%)
 3+13 (48%)12 (52%)
Mean time since last colonoscopy (mo)18.826.3
 Range0–730-72
History of partial colon resection8 (30%)3 (13%)
History of ever smoking12 (44%)14 (61%)
Current smoking2 (7%)4 (17%)
Average no. alcoholic drinks/wk (range)4.35 (0–42)5.48 (0–28)

NOTE: There were no statistically significant (P < 0.05) differences between arms in any of the listed variables.

Abbreviation: CRC, colorectal cancer.