" Youths aged 12 to 17 were asked several questions related to the extent of support, oversight, and control that they perceived their parents provided or exercised over them in the year prior to the survey interview. In 2012, among youths aged 12 to 17 who were enrolled in school in the past year, 70.3 percent reported that their parents limited the amount of time that they spent out with friends on school nights. This rate in 2012 was similar to the rate reported in 2011 (69.9 percent) and also in 2002 (70.7 percent). In 2012, 81.3 percent reported that in the past year their parents always or sometimes checked on whether or not they had completed their homework, and 80.6 percent reported that their parents always or sometimes provided help with their homework. Both of these rates reported in 2012 were similar to the rates in 2011 (81.1 and 80.4 percent, respectively). The rate in 2012 for parents checking on whether youths had completed their homework was higher than in 2002 (78.4 percent). However, the rate for parents providing help with homework in 2012 was similar to the rate in 2002 (81.4 percent)."
Substance Abuse and Mental Health Services Administration, Results from the 2012 National Survey on Drug Use and Health: Summary of National Findings, NSDUH Series H-46, HHS Publication No. (SMA) 13-4795. Rockville, MD: Substance Abuse and Mental Health Services Administration, 2013.