A school nurse is teaching a group of preadolescent girls about puberty. Which is the mean age of menarche for girls in the United States?
a. 11 1/2 years
b. 12 3/4 years
c. 13 1/2 years
d. 14 years
ANS: B
The average age of menarche is 12 years 9.5 months in North American girls, with a normal range of 10 1/2 to 15 years. Ages 11 1/2, 13 1/2, and 14 are within the normal range for menarche, but these are not the average ages.
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