Page "learned" Paragraph 202

In the lower portion of each Chart, the Skeletal Age ( Hand ) of boy 34 and girl 2 may be similarly classified.

There the middle one of the three curves denotes `` mean Skeletal Age '' for the Maturity Series boys and girls.

The upper curve denotes the mean plus one standard deviation, and the lower curve represents the mean minus one standard deviation.

Thus, a child's Skeletal Age `` dots '' may be classified as `` advanced '' when they appear above the middle curve, `` moderate '' when they appear immediately above or below the middle curve, and `` delayed '' when they appear below the lower curve.