Table 5.

Mean Age of Transition to Sexual Maturity Stages 2 and 3 and Menarche

Mean (yr)*SDSE
BreastTanner Stage 2
BreastTanner Stage 3
Pubic HairTanner Stage 2
Pubic HairTanner Stage 3
Any developmentTanner Stage 2
Any developmentTanner Stage 3
  • Abbreviations: SD, standard deviation; SE, standard error.

  • * P < 0.001 for the comparisons between African-American and white girls for each stage of development of breast, pubic hair, and menses.

  • Denotes the appearance of either breast or pubic hair or both.