The survey included more than 1, 000 youths from around thenationaged 12 to 17 and about half of their parents.
这项研究在全国范围内调查了1000多名12岁到17岁之间的青少年和一半他们的父母。
2
The study gathered data from 360 middle-aged African American, Caucasian, and Chinese women drawn from the Study of Women's Health Across the Nation, with a mean age of 51 years.