Sequence of puberty in females

Sequence of events in females with average timing of pubertal development in the United States. The median age for achieving each milestone is younger for Black females (dashed vertical line) compared with White females (dotted vertical line). The median length of time between the onset of puberty (breast Tanner stage 2) and menarche is 2.6 years, and the 95^th percentile is 4.5 years.