The cesarean delivery rate more than doubles when passing the 42nd week compared with 40 weeks because of cephalopelvic disproportion resulting from larger infants and by fetal intolerance of labor.

• 妊娠超过42周的患者，其剖宫产率是妊娠超过40周的患者的两倍，原因多为胎儿产程耐受不良，出现宫内窘迫或胎儿巨大造成头盆不称。