Figure 1.

Growth during pre-adult life history stages. The 50th percentile of first derivatives for both boys (solid line) and girls (dashed line) were calculated from the US CDC (2000) data. The upper part indicates the four pre-adult life history stages: infancy (I), childhood (C), juvenility (J), and adolescence (A). The three transition points are marked by a circle, and designated as ICT, infancy–childhood transition; CJT, childhood–juvenility transition; JAT, juvenility–adolescence transition.