Table 2.

Comparison of calculated gastric volume and measured gastric volume

Variables (unit)	Group P (n*=100)	Group NP (n=100)	P
Calculated gastric volume (USG†) (ml)	19.67 (6.01, 33.86)	20.11 (8.79, 33.74)	0.634
Gastric volume (ml/kg)	0.37 (0.11, 0.65)	0.34 (0.16, 0.64)	0.786
Measured gastric volume (OGT‡) (ml)	10 (10, 15)	14.5 (9, 20)	0.056
Gastric pH	4.35±1.12	3.88±0.85	0.01*
Gastric antral CSA§	3.13±0.96	3.12±0.99	0.97

*p-value < 0.05 considered statistically significant. Calculated gastric volume, measured gastric volumes, and weight-based gastric volume (ml/kg) were expressed in median with interquartile range. Gastric antral CSA and gastric pH were expressed as mean±SD. *n=number of participants in the group, ^†USG-ultrasonography, ^‡OGT-orogastric tube, ^§CSA-cross sectional