Table 1.

Selected pubertal parameters, by relative timing of puberty

Pubertal parameter		Early onset	On-time onset	Late onset
Age at onset of breast development	Black participants (N = 64)	<7.25	7.25–9.39	>9.39
	White participants (N = 119)	<7.67	7.67–9.94	>9.94
Peak height velocity (PHV), cm/year		7.18	6.96	6.60
Age of PHV, year		10.50	11.09	11.86
Duration pubertal growth, year		6.90	5.45	4.50