Cates W, Grimes D A, Smith J C, Tyler C W
Int J Gynaecol Obstet. 1977;15(2):172-6. doi: 10.1002/j.1879-3479.1977.tb00671.x.
Data gathered by the Center for Disease Control (CDC) through epidemiologic surveillance of deaths associated with legal abortions performed from 1972 through 1975 are analyzed by the type of procedure and the gestational age of the patients. Analysis shows that deaths increase at higher gestational ages and that the risk of death from abortion is highest with hysterotomy and hysterectomy and lowest with suction curettage. Second trimester instillation procedures are associated with higher rates of mortality than first trimester curettage procedures, even when dilatation and evacuation at 13-15 weeks' gestation is included as a curettage procedure. A case history of a patient who died as a result of legal abortion demonstrates that while legal abortion is a safe surgical procedure, some of the deaths that still occur can be prevented.
美国疾病控制中心（CDC）通过对1972年至1975年期间合法堕胎相关死亡病例的流行病学监测收集的数据，按手术类型和患者孕周进行了分析。分析表明，随着孕周增加，死亡人数增多，且堕胎死亡风险在子宫切开术和子宫切除术时最高，在负压吸引刮宫术时最低。即使将妊娠13 - 15周时的扩张和排空也算作刮宫术，孕中期羊膜腔内注射引产术的死亡率也高于孕早期刮宫术。一名因合法堕胎死亡的患者的病史表明，虽然合法堕胎是一种安全的外科手术，但仍有一些死亡是可以预防的。
