Porter J F
J Reprod Fertil Suppl. 1975 Apr(22):91-105.
The rhythm method (safe period) is the only contraceptive method which is approved and actively promoted by the Roman Catholic Church. It therefore holds and attraction to a large number of followers. This paper reviews the historical development of the method from the initial efforts in the nineteenth century to the work of Ogino and Knaus, and covers the variations which are based on alteration of the basal body temperature and changes in cervical mucus. Although this method should be devoid of side effects, certain risks have been reported due to the possible fertilization of an overripe ovum. There may also be a higher risk of ectopic pregnancy than normal to users of this method and these reports are reviewed. The results of field trials concerning the use effectiveness of the method are also examined.
安全期避孕法是唯一得到罗马天主教会认可并积极推广的避孕方法。因此，它吸引了大量追随者。本文回顾了该方法从19世纪的初步尝试到荻野和瑙斯的研究工作的历史发展，并涵盖了基于基础体温变化和宫颈黏液变化的不同方法。尽管这种方法应该没有副作用，但有报告称，由于过熟卵子可能受精，存在一定风险。使用这种方法的人发生宫外孕的风险可能也高于正常情况，本文对这些报告进行了综述。同时还研究了关于该方法使用效果的现场试验结果。
