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It seems clear, from the counter-balanced shape of the series of arrows in Figure 5 that there was about an equal number of early and late Onsets and Completions for the 34 girls.

Accordingly, if epiphyseal-diaphyseal fusion occurs in this phalanx near menarche, early and late menarches might have been forecast rather precisely at the time of Onset of ossification for the 18 girls with `` same schedule ''.

As an example of the interpretation of an arrow in the figure which exceeds four months in shaft length in conjunction with its position in the figure: girl 2 had a delayed Onset and further delayed Completion.

It is of interest that her menarche was somewhat later than the average for the girls in this group.