Table 1 Baseline and ultrasound characteristics in non-laboring and laboring women

Age (years)

30.0(3.7)

28.7(2.9)

0.060

BMI (kg·m⁻²)

26.1(3.1)

26.0(2.7)

0.883

Gestational age (weeks)

38.6(0.8)

39.0(1.3)

0.067

Gravidity, n (%)

< 0.001

 1

9 (18)

13 (74)

 2

19 (38)

9 (18)

 ≥3

22 (44)

10 (20)

Parity, n (%)

< 0.001

 0

13 (26)

37 (74)

 1

29 (58)

12 (24)

 ≥2

8 (16)

1 (2)

Fasting for solids (hours)

13.0 [11.7–15.0]

3.0 [0.8–4.0]

< 0.001

Fasting for liquids (hours)

11.5 [9.9–13.0]

1.0 [0.5–2.0]

< 0.001

Supine-CSA (mm²)

358 [328–437]

565 [450–843]

< 0.001

RLD-CSA (mm²)

557[462–646]

890 [661–1235]

< 0.001

Gastric volume (ml)

77.3 [59.5–98.6]

164.2 [108.9–251.1]

< 0.001

Gastric volume (ml· kg⁻¹)

1.2 [0.9–1.5]

2.4 [1.6–3.6]

< 0.001

Antral grade, n (%)

< 0.001

 Grade 0

33 (66)

8 (16)

 Grade 1

17 (34)

8 (16)

 Grade 2

0

7 (14)

 Grade 3

0

27 (54)