Growth spurt
As indicated in Figure 4.3, the growth spurt associated with puberty occurs approximately two years
earlier for girls than for boys.
x̄ of USA - 9 yrs for girls and 11 yrs for boys.
Pubertal change peaks at an avg. of 11.5 years for girls and 13.5 years for boys.
Girls ↑ height 3.5 inches /year, boys about 4 inches.
Boys and girls who are shorter or taller than their peers before adolescence.
At the beginning of adolescence, girls taller than boys but by the end of the middle school years most boys have caught up, or, even surpassed girls in height.
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