Wonderful study done in the UK. I know the results apply just as well in the U.S.
“Conducted by the Institute for Social and Economic Research’s Understanding Society, the study asked more than 2,000 10- to 15-year-olds in the United Kingdom how frequently they stayed out past 9 p.m. without their parents knowing where they were. According to the data, among 15-year-olds, 36 percent of boys and nearly a quarter of girls said their parents — at least once a month — do not know where they are. Moreover, 64 percent of 15-year-old girls who stay out frequently past 9 p.m. without their parents’ knowledge said they had consumed alcohol more than once in the last month, compared with only 25 percent of girls who had not stayed out in the past month. In addition, 18 percent of girls who said they had not stayed out past 9 p.m. reported smoking, and the number climbed to 51 percent among girls who stay out frequently.” (from an article by Teddi Dineley Johnson in The Nation’s Health.