Human Nature 17 (4):433-447 (2006)

It is widely believed that women who live together or who are close friends synchronize their menstrual cycles. We reexamined this phenomenon in two ways. First, we collected data on menstrual cycles from 186 Chinese women living in dorms for over a year. We found that women living in groups did not synchronize their cycles. Second, we reviewed the first study reporting menstrual synchrony. We found that group synchrony in that study was at the level of chance. We then show that cycle variability produces convergences and subsequent divergences of cycle onsets and may explain perceptions of synchrony
Keywords Estrous synchrony  Human pheromones  Menstrual cycles  Menstrual synchrony  Reproductive synchrony
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DOI 10.1007/s12110-006-1005-z
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