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Results from the 2013 national YRBS also indicate many high school students are engaged in behaviors associated with chronic diseases, such as cardiovascular disease, cancer, and diabetes.

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Nearly half (46.8%) of students had ever had sexual intercourse, 34.0% had had sexual intercourse during the 3 months before the survey (i.e., currently sexually active), and 15.0% had had sexual intercourse with four or more persons during their life.

Among currently sexually active students, 59.1% had used a condom during their last sexual intercourse.

Reporting Period Covered: September 2012–December 2013. Description of the System: The Youth Risk Behavior Surveillance System (YRBSS) monitors six categories of priority health-risk behaviors among youth and young adults: 1) behaviors that contribute to unintentional injuries and violence; 2) tobacco use; 3) alcohol and other drug use; 4) sexual behaviors that contribute to unintended pregnancy and sexually transmitted infections (STIs), including human immunodeficiency virus (HIV) infection; 5) unhealthy dietary behaviors; and 6) physical inactivity.

In addition, YRBSS monitors the prevalence of obesity and asthma.

To monitor priority health-risk behaviors in each of these six categories and obesity and asthma among youth and young adults, CDC developed the Youth Risk Behavior Surveillance System (YRBSS) (5).

In the United States, 70% of all deaths among youth and young adults aged 10–24 years result from four causes: motor vehicle crashes (23%), other unintentional injuries (18%), homicide (15%), and suicide (15%) (1).Data from five states and one large urban school district survey with unweighted data are not included.Among those with weighted data for 2013, one state and two large urban school district surveys were conducted during fall 2012; the national survey, 38 states, and 18 large urban school district surveys were conducted during spring 2013; and three states and one large urban school district survey were conducted during fall 2013.Interpretation: Many high school students engage in behaviors that place them at risk for the leading causes of morbidity and mortality.The prevalence of most health-risk behaviors varies by sex, race/ethnicity, and grade and across states and large urban school districts. Since the earliest year of data collection, the prevalence of most health-risk behaviors has decreased (e.g., physical fighting, current cigarette use, and current sexual activity), but the prevalence of other health-risk behaviors has not changed (e.g., suicide attempts treated by a doctor or nurse, having ever used marijuana, and having drunk alcohol or used drugs before last sexual intercourse) or has increased (e.g., having not gone to school because of safety concern and obesity and overweight).A three-stage cluster sample design produced a nationally representative sample of students in grades 9–12 who attend public and private schools.