Methods The 213 cases of antepartum misdiagnosed abruptio placentae from Nov. 1982 to Dec. 1994 were analyzed retrospectively, and compared with 169 cases of antepartum diagnosed group.

• 方法用回顾性分析方法对10年间胎盘早剥产前未确诊的213例（观察组）进行分析，并与同期产前确诊为胎盘早剥的169例（对照组）比较。