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.
Pirma, dauguma tyrimų prašė moterų įvertinti savo simptomus retrospektyviai, žvelgiant į praeitį ir kliaujantis atmintimi, kuri, kiek žinoma, PMS vertinimus padidina, lyginant su vadinamu prospektyviu vertinimu, kai reikia kasdien bent du mėnesius registruoti simptomus.