RT Book, Section A1 Irwin Jr., Charles E. A2 Rudolph, Colin D. A2 Rudolph, Abraham M. A2 Lister, George E. A2 First, Lewis R. A2 Gershon, Anne A. SR Print(0) ID 6737026 T1 Chapter 69. Morbidity T2 Rudolph's Pediatrics, 22e YR 2011 FD 2011 PB The McGraw-Hill Companies PP New York, NY SN 978-0-07-149723-7 LK accesspediatrics.mhmedical.com/content.aspx?aid=6737026 RD 2024/04/19 AB Risky health behaviors, rather than infectious or chronic diseases, are the leading causes of morbidity among adolescents.1-7 Most morbidity results from 3 risky behaviors initiated in early to middle adolescence: substance use, sexual activity, and motor/recreational vehicle use. These 3 behaviors tend to covary. For example, substance use plays a major role in motor vehicle crashes. Use of substances is associated with sexual behavior, often placing adolescents at risk for acquisition of sexually transmitted infections and unintended pregnancy.1