NEXT GENERATION STUDY, COHORT MAINTENANCE

NEXT是一项为期7年的纵向评估，以美国青少年和年轻人为样本，从10年级开始。NEXT纵向研究的目的包括：确定青少年健康状况和健康行为的轨迹，从青春期中期到高中毕业；检查这一时期发生主要青少年危险行为和危险指标的个体预测因素；识别促进或维持积极健康行为的遗传、个人、家庭、学校和社会/环境因素；确定健康风险和风险行为的转变点，以及这些转变的家庭、学校和社会/环境前兆的变化，并检查潜在的基因-环境相互作用在健康状况和健康行为发展中的作用。

NEXT is a 7-year longitudinal assessment of a representative sample of U.S. adolescent and young adults starting at grade 10. The goals of the NEXT longitudinal study include: to identify the trajectory of adolescent health status and health behaviors from mid-adolescence through the post high school years; to examine individual predictors of the onset of key adolescent risk behaviors and risk indicators during this period; to identify genetic, personal, family, school, and social/environmental factors that promote or sustain positive health behaviors; to identify transition points in health risk and risk behaviors and changes in family, school, and social/environmental precursors to these transitions, and to examine the role of potential gene-environment interactions in the development of health status and health behaviors. Assessments are conducted annually for seven years beginning in the 2009-2010 school year. African American youth are oversampled to provide a better population estimate and to provide an adequate sample to examine racial/ethnic differences in longitudinal predictors of health, health behaviors, and health behavior change. Self-reports of health status, health behaviors, and health attitudes are collected by in-school and online surveys. Anthropometric data, genetic information, and neighborhood characteristics are gathered on all participants as well. The study also incorporates a School Administrator Survey and other data files to obtain related information on school-level health programs and community-level contextual data Complete a comprehensive assessment of the data collection completeness in the NEXT, and NEXT Plus, studies also include peers of novice youth driver to determine their behavior, samples as of the WaveS Survey.