Colonoscopy procedural skills and training for new beginners

Table 1 Comparison of endoscopes: Adult-gastroscope vs intermediate length adult-colonoscope vs long length adult-colonoscope

Characteristic	Adult-gastroscope	Adult-colonoscope
		Intermediate length-type	Long length-type
Total length1	1350 mm (1.35 m)	1650 mm (1.65 m)	2000 mm (2 m)
Working length2	1030 mm (1.03 m)	1330 mm (1.33 m)	1680 mm (1.68 m)
Diameter	9.2 mm	12.9 mm
Diameter of instrument channel	2.8 mm	3.7 mm
Angulation range3	Up 210°, Down 90°, Right 100°, Left 100°	Up 180°, Down 180°, Right 160°, Left 160°

¹Total length is defined as the maximal length of the scope’s insertion;

²Working length is defined as the graduated length;

³The tip of scope, i.e., bending section, was angulated by the scope’s control knob.