Table 1. Baseline Patient Characteristics (n=399).

Variable	Value
Sex (male:female)	1.65:1
Age (yr)	58.38±12.97
BMI (kg/m2)	23.36±3.03
The aim of the procedurea
Screening	278
Surveillance after polyp removal	85
Constipation	12
Diarrhea	18
Othersb	44
The presence of underlying disease	168 (42.1)
History of operation	102 (25.6)

Values are presented as mean±SD or number (%).

^aThe patients can have multiple aim of the procedure.

^bHistory of colorectal cancer (n=10), fecal occult blood (n=10), abdomen pain (n=10), weight loss (n=7), anemia (n=4), and family history of colorectal cancer (n=3).