Main Findings
In the present study, we performed intrapartum ultrasonographic
assessments of fetal head station and position, which differed
significantly at various times during the labor. We developed a binary
logistic regression model based on maternal height and angle of
progression to predict 73.8% of vaginal deliveries at the latent labor
phase. Moreover, a simple prediction model combining middle angel and
maternal height for estimating the spontaneous fetal head rotation was
also obtained. Because these two models both require only two parameters
(one clinical variable and one intrapartum ultrasound parameter) that
can be easily acquired, we suppose both models can be applied in any
delivery unit.