For many years, because there was no standardization in the definition of PMS, when psychologists tried to report prevalence rates, their estimates ranged from five percent of women to 97 percent of women, so at the same time almost no one and almost everyone had PMS.
多年来，因为没有一个 对经前综合征的标准定义， 所以当心理学家尝试去报告患病率时， 他们的估算从5% 到97%的女性不等， 也就是说在同时，要么几乎没人有经前综合征， 要么几乎人人都有。