Pb. Kaplowitz et Se. Oberfield, Reexamination of the age limit for defining when puberty is precocious in girls in the United States: Implications for evaluation and treatment, PEDIATRICS, 104(4), 1999, pp. 936-941
In 1997 a study from the Pediatric Research in Office Settings network, bas
ed on pubertal staging of >17 000 girls between 3 and 12 years of age, indi
cated that breast and pubic hair development are occurring significantly ea
rlier than suggested by our current guidelines, especially in African-Ameri
can girls. In response to this article, the Lawson Wilkins Pediatric Endocr
ine Society undertook a comprehensive review of this topic. The primary con
clusions of this review are:
1. The current recommendation that breast development before age 8 is preco
cious is based on outdated studies. Until 1997, no data were available on p
ubertal staging in US girls that could have documented a trend to earlier m
aturation.
2. The 1997 study indicates that stage 2 of breast and pubic hair developme
nt is being achieved similar to 1 year earlier in white girls and 2 years e
arlier in African-American girls than previous studies have shown.
3. Concerns that girls with moderately precocious puberty will be significa
ntly short adults are overstated; most have adult height within the normal
range.
4. Therapy with gonadotropin-releasing hormone agonists has not been proven
to have a substantial effect on adult height in most girls whose puberty s
tarts between 6 and 8 years of age.
5. New guidelines propose that girls with either breast development or pubi
c hair should be evaluated if this occurs before age 7 in white girls and b
efore age 6 in African-American girls. No changes in the current guidelines
for evaluating boys (signs of puberty at younger than 9 years) can be made
at this time.