Table 3.

Gastric volume under gastric ultrasound in the two groups

	Group C (n = 50)	Group E (n = 50)	P-value
GV0 (ml, mean ± SD)	37.0 ± 7.9	38.4 ± 7.0	0.352
GV1 (ml, mean ± SD)	335.2 ± 14.1*	338.6 ± 14.3*	0.237
GV2 (ml, mean ± SD)	38.4 ± 6.9	37.1 ± 8.3	0.394

GV₀, gastric volume before oral liquid; GV₁, gastric volume immediately after oral liquid; GV₂, gastric volume before induction; SD, standard deviation

P-value indicates the statistical difference between the two groups at the same time point

^*Indicates a statistically significant difference compared with GV₀, P < 0.01