english: First, many studies asked women to report their symptoms retrospectively, looking to the past and relying on memory, which is known to inflate reporting of PMS compared to what's called prospective reporting, which involves keeping a daily log of symptoms for at least two months in a row.
non_english: Po prvé, ženy často mali udávať svoje symptómy až spätne, spoliehajúc sa na pamäť, čo preukázateľne zvyšuje  nahlásený výskyt PMS oproti metóde  prospektívneho hlásenia, ktorá obnáša denné zapisovanie symptómov počas minimálne dvoch mesiacov.