Table 3 Differences of the LUS (lower uterine segment) thickness related to possible influencing factors in the total study group with singleton pregnancies (n = 161). Significance levels (p), obtained from ANOVA analysis or Chi² tests are given. CS = cesarean section *p < 0.05 in comparison to the group < 24 + 0 gw, **p < 0.05 in comparison to the group 24 + 0–27 + 6 gw, ***p < 0.05 in comparison to the group 2000 < 3000 g

Parity

0.320

- Nulliparous

- one previous delivery

- two previous deliveries

- > two previous deliveries

Previous cesarean section

< 0.001

- yes

- no

Number of previous cesarean section

0.763

- one

- two

- >two

All patients

Prior CS

No CS

P (prior/no CS)

- < 24 + 0

3.1 ± 1.7

2.3 ± 1.0

4.1 ± 1.9

0.041

- 24 + 0–27 + 6

3.2 ± 1.9

2.0 ± 0.8

3.8 ± 2.1

0.018

- 28 + 0–31 + 6

2.5 ± 0.8

1.9 ± 0.6

2.8 ± 0.7

0.002

- 32 + 0–35 + 6

2.2 ± 0.8**

1.7 ± 0.6

2.5 ± 0.7

0.001

- 36 + 0–42 + 0

2.1 ± 0.8*,**

1.8 ± 0.8

2.2 ± 0.7

0.089

- <1000 g

3.0 ± 1.4***

2.0 ± 0.8

3.6 ± 1.3

0.001

- 1000 < 2000 g

2.8 ± 1.8***

1.7 ± 0.5

3.3 ± 2.0

0.023

- 2000 < 3000 g

1.9 ± 0.8

1.6 ± 0.5

2.3 ± 0.8

<0.001

- ≥3000 g

2.2 ± 0.9

2.0 ± 1.0

2.4 ± 0.7

0.309

- Head presentation

2.4 ± 1.4

1.8 ± 0.7

3.0 ± 1.6

<0.001

- Breech presentation

2.5 ± 0.9

2.2 ± 0.8

2.5 ± 0.8

0.240

- Transvers/oblique presentation

2.1 ± 1.1

1.3

2.9

- none-little amounts

2.3 ± 0.8

1.8 ± 0.6

2.5 ± 0.9

<0.001

- larger amounts

2.7 ± 1.6

1.9 ± 0.9

3.3 ± 1.7

<0.001

- sufficient

2.4 ± 1.2

1.9 ± 0.6

2.8 ± 1.4

<0.001

- insufficient

2.5 ± 1.2

1.9 ± 1.0

2.6 ± 1.0

0.003