Strengths and limitations
Our study has several limitations. The main drawback of this model is
the comparatively high cost of MRI examination. Generally, the current
cost of MR imaging is approximately 3- to 4-fold the cost of
ultrasonography. However, we simplified the acquisition parameters of
the MRI examination for this model, which should reduce the cost of MRI
for this specific population with suspected CPD. Hopefully, with the
simplification of the MRI examination, the benefit of this method would
outweigh the cost arguments. In addition, our study population included
only Chinese women, and our results might not be representative of other
ethnic populations. Furthermore, we only performed internal validation
using bootstrap resampling, and further external validation should be
required from other populations. Despite these limitations, we
constructed a nomogram model to predict the risk of cesarean delivery
with good accuracy; to our knowledge, it potentially was the first time.