Table 2 Ultrasound-measured antral area and gastric volume by the gastric antral grades

Grade 0

n = 92

n = 130

 CSA in supine, cm²

2.7 (2.0, 3.4)

2.9 (2.4, 3.7)

0.067

 CSA in RLD, cm²

4.1 (3.3, 5.3)

4.2 (3.6, 5.1)

0.980

 Predicted volume, mL^a

16.4 (0, 42.1)

11.9 (0, 29.1)

0.088

 Predicted volume, mL/kg

0.3 (0, 0.7)

0.2 (0, 0.4)

0.084

Grade 1

n = 138

n = 159

 CSA in supine, cm²

3.4 (2.6, 4.8)

3.7 (3.0, 4.6)

0.312

 CSA in RLD, cm²

7.5 (5.7, 9.2)

7.1 (6.1, 8.6)

0.594

 Predicted volume, mL^a

55.6 (32.6, 83.1)

48.3 (31.4, 75.8)

0.216

 Predicted volume, mL/kg

0.9 (0.5, 1.3)

0.8 (0.5, 1.1)

0.197

Grade 2

n = 70

n = 11

 CSA in supine, cm²

6.3 (4.6, 8.9)

5.3 (4.3, 6.5)

0.247

 CSA in RLD, cm²

10.5 (7.8, 14.5)

9.4 (8.1, 12.2)

0.370

 Predicted volume, mL^a

106.5 (59.5, 166.6)

85.7 (76.9, 118.8)

0.385

 Predicted volume, mL/kg

1.7 (0.9, 2.6)

1.3 (1.1, 1.9)

0.356