Fig. 4

Differences of the LUS in relation to factors associated with intrauterine pressure such as gestational age (a), estimated fetal weight (b) and estimated amounts of amniotic fluid between fetus and LUS (c) in controls without cesarean section (broken lines) and patients (continuous lines). Error bars represent the 95% confidence interval of each group. a: *p < 0.05 compared to group <24 + 0 gw, **p < 0.05 compared to group 24 + 0–27 + 6 gw (b): *p < 0.05 compared to group <1000 g, **p < 0.05 in comparison to the group 1000 < 2000 g (c): *p < 0.05