Indicators of Child, Family, and Community Connections. National Longitudinal Study of Adolescent Health (Add Health)


National Longitudinal Study of Adolescent Health (Add Health)
Name: National Longitudinal Study of Adolescent Health
Funder(s): National Institute of Child Health and Human Development (NICHD) and 17 other federal agencies
General Description: Add Health focuses on the causes of health-related behaviors of adolescents, collecting data from surveys of students, parents, and school administrators.
Design (cross-sectional vs. longitudinal; periodicity; mode of administration): Longitudinal. Four surveys were conducted during Wave I (1994 through 1995): in-school, in-home, school administrator, and parent surveys. Wave II (1996) consisted of in-home and school administrator surveys. Wave III (August 2001 through April 2002) consisted of an in-home survey. Already existing databases provided information about neighborhoods and communities. Questionnaires were administered directly to students using Computer-Assisted Personal Interview (CAPI) and Computer-Assisted Self-Interview (CASI) systems.
Population: Add Health is representative of students in the U.S. in grades 7 through 12 in 1997.
Sample Selection and Description: The Wave I In-School Survey collected information from 90,188 students in 80 pairs of schools (each pair consisted of one high school and one of its feeder middle schools, or a single school if it included grades 7 to 12). Approximately 200 adolescents from each school pair were selected for in-home interviews at Wave I; however, in 16 schools, in-home interviews were conducted with all students in order to collect information about adolescent social networks. The sample size for the Wave I In-home Survey was 20,745. The Wave II In-Home Survey sample consisted of 14,738 adolescents who participated in the Wave I survey. The Wave III In-Home Survey sample consisted of 15,197 young adults who participated in the Wave I survey. The study over-sampled African Americans with college-educated parents, Chinese, Cuban, Puerto Rican, and physically-disabled adolescents as well as genetic samples of pairs of siblings who resided in the same household (twins, full and half-siblings, and unrelated teens in the same household).
Age of Respondent: Wave I (1995) was made up of subjects in grades 7-12. Wave II (1996) was made up of these subjects one year later (grades 8-12), but did not include those who were 12th graders at Wave I. In Wave III, the respondents were 18 to 26 years old.
Age of Child: See "Age of Respondent"
Indicators: Youth connection to
School peersSchool supportiveness

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