Fig. 1From: Pubertal timing and breast density in young women: a prospective cohort studyPubertal and breast density risk factors for breast cancer across the life course. Thelarche and pubarche mark the onset of breast development and pubic hair growth, respectively. Menarche is the onset of menstruation. The age at onset determines the pubertal timing of these events, and the time between these events is known as pubertal tempoBack to article page