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The 1,259 PSUs were categorized into 16 strata according to their metropolitan statistical area (MSA) status (e.g., urban city) and the percentages of black and Hispanic students in the PSUs.From the 1,259 PSUs, 54 were sampled with probability proportional to overall school enrollment size for the PSU.YRBSS includes school-based national, state, and large urban school district Youth Risk Behavior Surveys (YRBS) conducted among representative samples of students in grades 9–12.National, state, and large urban school distr ict surveys have been conducted biennially since 1991 ( Table 1).Additional information about YRBSS is available at

Data from 10 state and two large urban school district surveys with unweighted data are not included.To enable a separate analysis of data for black and Hispanic students, two classes per grade, rather than one, were sampled in schools with a high minority enrollment.Before the 2013 national YRBS, three strategies were used to oversample black and Hispanic students: 1) larger sampling rates were used to select PSUs that were in high-black and high-Hispanic strata; 2) a modified measure of size was used to increase the probability of sampling schools with a disproportionately high minority enrollment; and 3) two classes per grade, rather than one, were sampled in schools with a high minority enrollment.In the United States in 2014, 71% of all deaths among persons aged 10–24 years resulted from four causes: motor vehicle crashes (23%), other unintentional injuries (17%), homicide (14%), and suicide (17%) ().These leading causes of mortality, morbidity, and social problems among youth and adults in the United States are related to six categories of priority health behaviors: 1) behaviors that contribute to unintentional injuries and violence; 2) tobacco use; 3) alcohol and other drug use; 4) sexual behaviors that related to unintended pregnancy and sexually transmitted infections (STIs), including HIV infection; 5) unhealthy dietary behaviors; and 6) physical inactivity.

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