Table 4 Univariate and multivariate regression analyses regarding possible influencing factors on lower uterine segment thickness in the total study group with singleton pregnancies (n = 161). The results are presented with p-value, Beta coefficient and its 95% confidence interval [95% CI]. *p < 0.05, **p < 0.001

Previous cesarean section

<0.001; − 0.362 [− 1.238-(− 0.526)]**

<0.001; − 0.444 [− 1.466-(− 0.760)]**

Gestational age (weeks)

<0.001; − 0.315 [−0.102-(−0.037)]**

<0.001; −0.670 [−0.227-(−0.080)]**

Estimated fetal weight

0.003; − 0.242 [− 0.001–0.000]*

0.036; 0.344 [0.00–0.001]*

Fluid between fetus and LUS

0.022; 0.180 [0.062–0.808]*

0.148; 0.107 [− 0.098–0.640]