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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

From: Comparison of the lower uterine segment in pregnant women with and without previous cesarean section in 3 T MRI

  Mean LUS-thickness (mm) p
Parity   0.320
- Nulliparous 2.7 ± 1.3  
- one previous delivery 2.2 ± 1.1  
- two previous deliveries 2.0 ± 0.9  
- > two previous deliveries 2.3 ± 1.0  
Previous cesarean section   < 0.001
- yes 1.9 ± 0.7  
- no 2.7 ± 1.3  
Number of previous cesarean section   0.763
- one 1.9 ± 0.7  
- two 2.1 ± 1.0  
- >two 1.8 ± 0.6  
  All patients Prior CS No CS P (prior/no CS)
Gestational age at MRI-examination
- < 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
Estimated fetal weight (g) at examination
- <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
Fetal position
- 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  
Amounts of amniotic fluid between fetus and LUS
- 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
Filling level of the urinary bladder
- 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