http://www.cnn.com/2010/HEALTH/08/09/girls.starting.puberty.early/index.html?iref=allsearchBut the trend toward earlier puberty is
not as pronounced among blacks as it is among whites, the researchers say. Although the rate of early puberty among black girls in the study (23 percent) was higher than that observed in the early 1990s (15 percent), the increase was
not statistically significant.