Table 2.

Effect of preparation on intraluminal gas bubbles

Group	Proportion of time (%)
	Segment A			Segment B
	No and slight	Moderate	Severe	No and slight	Moderate	Severe
1 (n=32)	67.2±25.7	20.1±19.4	12.8±11.6	68.8±28.8	14.6±17.1	16.7±20.4
2 (n=32)	97.1±5.8	2.9±5.8	0.0±0.0	99.0±3.5	1.0±3.5	0.0±0.0
P	<0.001	<0.001	<0.001	<0.001	<0.001	<0.001