Table 1 Patient characteristics and clinical parameters

Number of pregnancy

2.3 ± 1.0

2.4 ± 0.8

0.429

Parity

0.9 ± 0.5

0.9 ± 0.6

0.861

Age (years)

33.2 ± 3.9

32.7 ± 4.9

0.584

Weight (kg)

63.7 ± 8.0

72.7 ± 6.8

<  0.001

Height (cm)

153.1 ± 3.5

169.5 ± 2.1

<  0.001

Body mass index (kg/m²)

27.2 ± 3.1

25.3 ± 2.3

0.002

Vertebral column length (cm)

60.7 ± 3.0

68.0 ± 3.4

<  0.001

Gestation (wk)

38.4 ± 0.8

38.5 ± 0.8

0.793

Abdominal girth (cm)

96.1 ± 5.1

98.0 ± 5.0

0.09

Amniotic fluid index (mm)

150.4 ± 44.2

137.3 ± 25.2

0.09

Weight gain (kg)

12.6 ± 3.5

14.5 ± 3.8

0.017

Duration of surgery (min)

42.5 ± 13.4

41.8 ± 13.2

0.813

Apgar score at 1 min

9.5 ± 0.5

9.5 ± 0.5

0.701

Apgar score at 5 min

9.9 ± 0.3

9.9 ± 0.3

0.508

Neonatal weight (kg)

3.2 ± 0.5

3.3 ± 0.4

0.113

Dermatome level at incision

T5

T5

0.767

Highest level of block

T3

T4

0.002

Dermatome level at surgery completion

T7

T7

0.755