The Year 15 follow-up wave of data collection took place from 2014 to 2017. Data collection rolled out in four waves, and includes: Primary Caregiver (PCG) Interviews (1-Hour Telephone Survey); Teen Interviews (1-Hour Telephone Survey); and In-Home Surveys. Data collected in the PCG survey includes information on the teen's health and behavior, education, family life and parenting, household structure and family relationships, non-residential biological parents, co-residential biological parent or partner, PCG health and behavior, social environment and informal support, housing and programs, parent’s education, employment and income. Teen surveys include information on education and school experiences, family relationships, health and health behavior, neighborhood, and risky behaviors including sexual activity and substance use. During Home Visits, interviewers also took physical measurements of the teen’s height, weight and waist circumference and saliva samples for genetic analysis as well as observations of the home and PCG-teen interactions.