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IMG_NEW_0045 - The standard deviation for age at peak...

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The standard deviation for age at peak height velocity is slightly less than one year. The peak height velocity is highest in early-maturing children and lowest in late-maturing children. Since the peak height velocity may occrr as much as two years earlier or later than the average within each sex, a six year difference in the event between an early maturing girl and a late maturing boy is quite possible. The conclusion of the growth spurt is followed by a rapid slowing of growth. In USA cross-sectional studies, boys with a mean takeoff age of 1 1 years reached their final heights by 17-18 years of age, and girls with a mean takeoff age of 9 years reached their final heights by 14-15 years of age. However, there is a wide variation around these means - plus or minus two years' irr.i; ,, ir^ ^ {1 r i r { l Boys end=up-b"-tqg.!g,11qf lhgn grtls b-gcau,s,e tlrgyhave two- -more years of growth before tnegowt6.sp"4. ou.itrg ttt"r- two extra y.ursof prepubert"r g"*irr U ft$, irraj.Z, "., growing relatively faster than the trunk.
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