I didn't care for the start of this long article (telling of a mother trying out a quake alternative medicine guy to see why her daughter is undergoing very early puberty,) but apart from that, it's a good explanation of the phenomena.
I didn't realise this:
Now most researchers seem to agree on one thing: Breast budding in girls is starting earlier. The debate has shifted to what this means. Puberty, in girls, involves three events: the growth of breasts, the growth of pubic hair and a first period. Typically the changes unfold in that order, and the process takes about two years. But the data show a confounding pattern. While studies have shown that the average age of breast budding has fallen significantly since the 1970s, the average age of first period, or menarche, has remained fairly constant, dropping to only 12.5 from 12.8 years. Why would puberty be starting earlier yet ending more or less at the same time?
I also didn't know that the differences between racial groups was so distinct:
Then in August 2010, the conflict seemed to resolve. Well-respected researchers at three big institutions — Cincinnati Children’s Hospital, Kaiser Permanente of Northern California and Mount Sinai School of Medicine in New York — published another study in Pediatrics, finding that by age 7, 10 percent of white girls, 23 percent of black girls, 15 percent of Hispanic girls and 2 percent of Asian girls had started developing breasts.
Pretty remarkable, and it also seems very difficult to work out exactly what is going on.
Anyway, its good of the NYT to put such lengthy magazine articles up. It remains, to my mind, one of the most generous media sites around.
No comments:
Post a Comment