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.
Selama bertahun-tahun, karena tidak ada ketetapan tentang definisi PMS, ketika psikolog hendak melaporkan rata-rata terjadinya PMS, perkiraan mereka berkisar dari lima persen hingga 97 persen wanita, jadi, hampir semua wanita mengalami dan tidak mengalami PMS.