1.The prevalence of PMS was measured according to the Diagnostic criteria adopted by the ACOG (2005). ACOG recommends using the PMS diagnostic criteria developed by the University of California at San Diego. The criteria includes the appearance of at least one of the following affective and somatic symptoms during the 5 days before menses in each of the three previous cycles, which began to disappear with the onset of the menses: depression, angry outburst, irritability, anxiety, confusion, social withdrawal, breast tenderness, abdominal bloating, headache and swelling of extremities. Women were asked to indicate if they experience any one of these symptoms during the last three previous cycles. Those who met the diagnostic criteria were considered as having PMS.