National Longitudinal Study of Adolescent Health (Add Health), 1994-2008: Core Files [Restricted Use] (ICPSR 27021)
Principal Investigator(s): Harris, Kathleen Mullan, University of North Carolina-Chapel Hill; Udry, J. Richard, University of North Carolina-Chapel Hill
The National Longitudinal Study of Adolescent Health (Add Health) is a longitudinal study of a nationally representative sample of adolescents in grades 7-12 in the United States during the 1994-1995 school year. The Add Health cohort has been followed into young adulthood with four in-home interviews, the most recent in 2008, when the sample was aged 24-32. Add Health combines longitudinal survey data on respondents' social, economic, psychological, and physical well-being with contextual data on the family, neighborhood, community, school, friendships, peer groups, and romantic relationships, providing unique opportunities to study how social environments and behaviors in adolescence are linked to health and achievement outcomes in young adulthood. The fourth wave of interviews expanded biological linkages in health trajectories as the Add Health cohort ages through adulthood. The Add Health core data files are comprised of the Waves I-IV In-Home Interview data and corresponding In-Home Interview section detail data; Wave I In-School Questionnaire data, Wave I and II School Administrator data; School Information data; and six Add Health Weights file data. For more information, please see the study website.
One or more files in this study are not available for download due to special restrictions ; consult the restrictions note to learn more. You can apply online for access to the data. A login is required to apply for access.
All data in this study are restricted and are available under Restricted Data Use Agreement.
This study is maintained and distributed by Data Sharing and Demographic Research, a project funded by the Eunice Kennedy Shriver National Institute of Child Health and Human Development (NICHD).
WARNING: Because this study has many datasets, the download all files option has been suppressed, and you will need to download one dataset at a time.
Harris, Kathleen Mullan, and J. Richard Udry. National Longitudinal Study of Adolescent Health (Add Health), 1994-2008: Core Files [Restricted Use]. ICPSR27021-v11. Chapel Hill, NC: Carolina Population Center, University of North Carolina-Chapel Hill/Ann Arbor, MI: Inter-university Consortium for Political and Social Research [distributors], 2013-01-17. doi:10.3886/ICPSR27021.v11
Persistent URL: http://doi.org/10.3886/ICPSR27021.v11
This study was funded by:
- United States Department of Health and Human Services. National Institutes of Health. National Cancer Institute
- United States Department of Health and Human Services. National Institutes of Health. National Institute on Alcohol Abuse and Alcoholism
- United States Department of Health and Human Services. National Institutes of Health. National Institute on Deafness and Other Communication Disorders
- United States Department of Health and Human Services. National Institutes of Health. National Institute on Drug Abuse
- United States Department of Health and Human Services. National Institutes of Health. National Institute of General Medical Sciences
- United States Department of Health and Human Services. National Institutes of Health. National Institute of Mental Health
- United States Department of Health and Human Services. National Institutes of Health. National Institute of Nursing Research
- United States Department of Health and Human Services. National Institutes of Health. Office of AIDS Research
- United States Department of Health and Human Services. National Institutes of Health. Office of Behavioral and Social Sciences Research
- United States Department of Health and Human Services. National Institutes of Health. Office of Research on Women's Health
- United States Department of Health and Human Services. Office of Public Health and Science. Office of Population Affairs
- United States Department of Health and Human Services. Centers for Disease Control and Prevention. National Center for Health Statistics
- United States Department of Health and Human Services. National Institutes of Health. Eunice Kennedy Shriver National Institute of Child Health and Human Development (P01-HD31921)
- United States Department of Health and Human Services. Centers for Disease Control and Prevention. Office of Minority Health and Health Disparities
- United States Department of Health and Human Services. Office of Public Health and Science. Office of Minority Health
- United States Department of Health and Human Services. Office of the Assistant Secretary for Planning and Evaluation
- National Science Foundation
Scope of Study
Subject Terms: academic achievement, adolescents, alcohol consumption, birth control, classroom environment, dating (social), drinking behavior, drug use, eating habits, educational environment, families, family planning, family relationships, family structure, friendships, health, health behavior, health care access, health status, household composition, interpersonal relations, living arrangements, marriage, neighborhood characteristics, neighborhoods, parent child relationship, parental attitudes, parental influence, physical characteristics, physical condition, physical fitness, physical limitations, public assistance programs, religious behavior, religious beliefs, reproductive history, school attendance, self concept, self esteem, sexual attitudes, sexual behavior, smoking, social environment, social networks, tobacco use, violence, welfare services
Geographic Coverage: United States
Date of Collection:
Unit of Observation: individual
Universe: Adolescents in grades 7-12 and their families.
Data Types: survey data
Data Collection Notes:
Wave I and Wave II field work was conducted by the National Opinion Research Center of the University of Chicago. Wave III field work was conducted by the Research Triangle Institute.
Sample: Wave I, Stage 1 School sample: stratified, random sample of all high schools in the United States. A school was eligible for the sample if it included an 11th grade and had a minimum enrollment of 30 students. A feeder school, a school that sent graduates to the high school and that included a 7th grade, was also recruited from the community. Wave I, Stage 2: An in-home sample of 27,000 adolescents was drawn consisting of a core sample from each community plus selected special over samples. Eligibility for over samples was determined by an adolescent's responses on the In-School Questionnaire. Adolescents could qualify for more than one sample. In addition, parents were asked to complete a questionnaire about family and relationships. The Wave II in-home interview sample is the same as the Wave I in-home interview sample, with a few exceptions. Information about neighborhoods/communities was gathered from a variety of previously published databases. Wave III: The in-home Wave III sample consists of Wave I respondents who could be located and re-interviewed six years later. Wave III also collected High School Transcript Release Forms as well as samples of urine and saliva.
Weight: Weight variables for Wave I (21600-0001) are in a separate data file: 21600-0002. Weights for Wave II are included in the Wave I weight data file: 21600-0002. Wave III weights are in a separate data file: 21600-0013. Education data weights are in 21600-0016 and 21600-0017.
Mode of Data Collection: audio computer-assisted self interview (ACASI), record abstracts, computer-assisted personal interview (CAPI), computer-assisted self interview (CASI), computer-assisted telephone interview (CATI), coded on-site observation, cognitive assessment test, face-to-face interview, paper and pencil interview (PAPI), self-enumerated questionnaire, on-site questionnaire, telephone interview
Extent of Processing: ICPSR data undergo a confidentiality review and are altered when necessary to limit the risk of disclosure. ICPSR also routinely creates ready-to-go data files along with setups in the major statistical software formats as well as standard codebooks to accompany the data. In addition to these procedures, ICPSR performed the following processing steps for this data collection:
- Performed consistency checks.
- Standardized missing values.
- Checked for undocumented or out-of-range codes.
Original ICPSR Release: 2010-01-26
- 2013-07-24 The Codebook for Wave IV In-Home Interview section 16A has been updated. On the variables H4TR7 and H4TR8, the asterisk has been removed from the Questions and placed next to the value label "Missing."
- 2013-01-17 Per Add Health's request, the data and documentation related to Part 29 (Wave IV Weights Data for Previous Users) have been removed from this study. Further, a minor edit was made to the codebooks for parts 1, 2, 3, and 12.
- 2012-09-12 Two documentation files, namely the Wave III In-Home Interview Data Codebook, along with the Original Add Health Wave III In-Home Interview Data Codebook, have been updated for part 3.
- 2012-05-09 The updated Part 12 file has been released.
- 2012-05-02 Updated part 12 of the study with a new corrected file. Variable H4BPCLS has been corrected in this new data file for part 12. The documentation for part 12 has been updated to reflect the corrected variable H4BPCLS. Part 29: Variable AID in part 29 originally was 8 digits and had been truncated to 7 digits during ICPSR processing. The AID variable has been fixed back to the original 8 digits. Only the data have been updated.
- 2012-03-02 Updated pt28 to include a variable that was accidentally removed at the last update.
- 2012-02-14 Updated pt28 to correct a truncation of the AID variable.
- 2012-02-06 An error was discovered in a few variables for part 12, so the data and documentation was updated.
- 2011-12-19 Added another weight file for users who already have the rest of the data. Updated a variable in pt12.
- 2011-12-01 Updated weight dataset and added/updated weight documentation.
- 2011-07-05 Part 12 was updated to correct an error in the value labels for a variable, and another small error was corrected in the rp27021-00028.pdf file.
- 2011-04-22 A small error in the question text was discovered.
- 2011-04-11 At PI's request, the original Parent and Adolescent codebooks were added to part 1 as separate documents
- 2011-02-18 Title, summary, and collection dates were updated to reflect an additional data collection wave in 2008.
- 2010-09-02 The Weight file for Wave IV was revised to include updated information on five participants.
- 2010-06-23 A minor change was made for two variable labels for Part 12.
- 2010-06-02 A minor revision was made to the codebooks for parts 1, 2, 3, and 12.
- 2010-05-11 A variable width had to be changed so the ASCII version of the data file would work correctly.
- 2010-04-22 A change was made to two variables labels in Part 12. Value labels and question text were added to Parts 2, 6, 12, 15, and 21.
- 2010-02-03 Codebooks and documentation were made available for public download.
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DS1: Wave I In-Home Interview Data
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DS3: Wave III In-Home Interview Data
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