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.
Dugi niz godina, zbog  nepostojanja standardizacije kod definiranja PMS-a kada su psiholozi pokušali izvijestiti o stopi rasprostranjenosti njihove procjene su se protezale od 5 posto žena do 97 posto žena, tako da u isto vrijeme skoro  nitko nije imao PMS, ali i skoro svi.