The final sample consisted of 254 participants whose age ranged between 18 and 45 years (mean 23.5, SD = 6.1). The majority of the sample were single (n = 202, 79.5%). Out of the total sample, 95 (37.4%) participants were employees and 159 (61.8%) were students. Most participants (88.6%) were non-smokers, and only 94 (37%) were regular coffee drinkers. More than half of the participants (64.1%) indicated that they sleep on average 7–9 h per day (mean = 7.6, SD = 1.6). Of the total sample, only 38 (15.5%) had been pregnant at least one time. Only nine women (3.7%) used oral contraceptives to relieve the symptoms of PMS. Approximately 36 (14.3%) of the sample had a sick leave or absent from work or school because of severity of premenstrual symptoms. Most of the participants (71.1%) had a regular menstrual cycle. Table 1 summarizes the characteristics of the study sample relating to socio-demographic and other gynaecological data.