Beckmann M, Dame W R, Beller F K
Geburtshilfe Frauenheilkd. 1978 Aug;38(8):640-2.
For the evaluation of the effectiveness of contraceptives the Life Table method is at present the best method. It is a disadvantage that the original method of Tietze & Potter was restricted to the evaluation of intra-uterine contraception devices. A Belgian team is now in the process of developing a modified life table method for the evaluation of the effectiveness and the side effects of oral contraceptives. The reference to the Pearl-index for the effectiveness of contraceptives is unclear and in the way in which it is at present used scientifically untenable.
就避孕药有效性的评估而言，生命表法目前是最佳方法。蒂策和波特的原始方法局限于宫内避孕器具的评估，这是一个缺点。一个比利时团队目前正在开发一种改良的生命表法，用于评估口服避孕药的有效性和副作用。关于避孕药有效性的皮尔指数的参考并不明确，而且就其目前的使用方式而言，在科学上是站不住脚的。
