The impact of social interaction factors on menstrual synchrony in the workplace.

The two objectives of this study were: (1) to examine the impact of social interaction variables (e.g., friendship, time working together, and activity) on the occurrence of menstrual synchrony; (2) to examine the menstrual synchrony of women who work together in an office. The sample consisted of 72 women soldiers in two army bases, and a civilian sample of 36 office workers. None of the samples showed significant synchrony. However, social interaction variables were found to be important factors contributing to the relative degree of synchrony. Friendship, mutual activity, and length of time working together were significantly related to the degree of synchrony.