Objective To investigate the influential factors of primary dysmenorrhea( PD) in female college students and to help them have a clear understanding on PD,and offer effective strategies to relieve it. Methods The subjects were selected by cluster random sampling method and stratified by grade. A total of 1 272 female college students who from three university of Xinxiang city were surveyed by self-made questionnaire. Results A total of 1 272 questionnaire were send out and 1154 valid questionnaires were tak...