Figure 3. Comparison of the distribution density of the age at onset of adrenarche among Sylheti, first-generation, second-generation, and European girls determined by Weibull regression models for parametric survival analysis.

The curves plot the predicted density of adrenarche on the Y axis and by age on the X axis, with the peak of each curve corresponding to the median age at adrenarche. The median age at adrenarche for each migration group was: Sylheti = 7.2, first-generation = 5.3, second-generation = 7.4, Europeans = 7.1; p-trend = 0.7. First-generation girls reached adrenarche significantly earlier than all other groups (p<0.01).