PDLUS precludes accurate cervical length (CL) measurement as the location of the true internal os is obscured. PDLUS is protective against spontaneous preterm birth (sPTB) in women with a prior sPTB < ...

Except for the isometric force of the cervical extensor muscles measured at levels II and III, the differences between the other levels were significant (p<0.05). There was a significant correlation ...