Ultrasound finding

Per-labour CS (SD)

Labour CS (SD)

Significance

Presence of niche

110

84

X² = 18.2. p < 0.01

RMT (mm)

5.06 (1.2)

4.99 (1.3)

t = 0.38, p = 0.71

RMT as proportion of anterior wall

0.60 (0.06)

0.60 (0.08)

t = 0.17, p = 0.87

CS scar defect dimensions (mm)

Defect length

4.35 (1.21)

4.58 (1.18)

t = −1.36, p = 0.18

Defect depth

3.24 (0.74)

3.36 (1.02)

t = −0.97, p = 0.34

Length from internal os (cm)

To CS scar

0.85 (0.22)

0.89 (0.24)

t = −1.09, p = 0.28

To external os

3.24 (0.39)

3.21 (0.24)

t = 0.56, p = 0.57