Table 1. Baseline characteristics.

Variables	Findings
Age, yr	56.2 ± 13.0
Gender (male: female)	1:0.65
Detection rate of polyps, No. with polyp/No. of examined	2,525/4,711 (53.6%)
Mean number of polyps per patient	2.0 (5,058/2,525)
Rate of sub-centimeter (below 10 mm) polyps	4,704/5,058 (93.0%)
Rate of sub-centimeter (below 10 mm) adenomas	2,761/4,704 (58.7%)