TABLE 1.

Median Age of Menarche, the Proportion of Girls Who Underwent Menarche by Age 11 Years, and Mean Levels of BMI and Triceps Skinfold Thickness, by Race and Examination Among Girls in the Cross-Sectional Sample*

Examination YearsNMedian Age of MenarcheMenarche (%) Before Age 11.0 YearsBMI (kg/m2)Height (cm)
Whites§Blacks§WhitesBlacksWhitesBlacksWhitesBlacks
Overall915812.7 (12.6–12.8)12.5 (12.4–12.6)7%11%17.517.5132135
1973–1974139812.7 (12.6–12.9)12.9 (12.7–13.1)7%5%16.816.7132134
1976–1977156112.9 (12.7–13.1)12.6 (12.4–12.8)5%7%16.917.3132135
1978–1979131912.9 (12.8–13.1)12.8 (12.6–13.0)6%6%17.117.6131135
1981–1982119712.9 (12.7–13.0)12.4 (12.4–12.6)6%11%17.417.5133135
1984–1985123912.6 (12.4–12.7)12.1 (11.8–12.3)8%21%17.617.3133135
1987–1988121412.6 (12.4–12.8)12.2 (11.9–12.4)11%14%18.117.6133135
1992–1994123012.5 (12.4–12.8)12.1 (11.9–12.3)10%17%18.718.7134137
  • * Analyses were restricted to 9158 girls between the ages of 7.0 and 16.9 years.

  • Median age (and % of girls who experienced menarche by age 11 years) was estimated in cross-sectional analyses using logistic regression.

  • Estimates of mean BMI and height are restricted to girls between the ages of 7.0 and 10.9 years and have been adjusted for the effects of age.

  • § 95% confidence interval is shown in parentheses.