Risk behaviors were also assessed by ACASI using questions derived from the CDC’s Youth Risk Behavior Survey (YRBS),(Centers for Disease Control and Prevention, 2003) and NIDA’s Monitoring the Future study (MTF) (Johnston, Bachman, & O’Malley, 2006; Johnston, O’Malley, & Bachman, 2003; Schulenberg, O’Malley, Bachman, Wadsworth, & Johnston, 1996). The YRBS and MTF have been used in national surveys of students (Kolbe, Kann, & Collins, 1993), and all questions were selected to be appropriate for participants in our cohort. Questions were screened to ensure that they were easily understood and used current slang terms for drugs and behaviors. The following categories of behaviors were surveyed: tobacco, alcohol, and other drug use; gambling for money; fighting; and, sexual behaviors that contribute to unintended pregnancy and sexually transmitted diseases. For substance use and gambling, questions asked about ever and recent use (past 30 days). For those who reported fighting, we asked about frequency of fighting in the past 12 months.
