“…Furthermore, 4.8% in the first-trimester screening group compared with 13% in the second-trimester ultrasound group had labor induced for a postterm pregnancy (RR 0.37, 95% CI 0.14-0.96), which is a 63% reduction in the induction rate for postterm pregnancy (11,12). Compared with no routine early ultrasound, routine early pregnancy (<20 weeks) ultrasound reduces by 32% to 39% the incidence of postterm pregnancy and of induction for postterm pregnancy (3,11,12) (see also chap.…”