National Longitudinal Study of Adolescent Health ICPSR

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National Longitudinal Study of Adolescent Health
_at_ ICPSR

• Felicia LeClere
• Russ Hathaway
• With help from the faculty and staff at Carolina
  Population Center, University of North Carolina

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National Longitudinal Study of Adolescent Health

• On-going study of the developmental and health
  trajectories of a nationally-representative
  sample of 20,000 adolescents
• Initiated in 1994 in response to a congressional
  mandate to fund a study of adolescent health
• Funded by the National Institute of Child Health
  and Human Development (NICHD) with co-funding
  from multiple other federal agencies

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National Longitudinal Study of Adolescent Health

• Developed and coordinated by researchers at UNCs
  Carolina Population Center
• PrincipaI Investigator/Director
• Waves IIII J. Richard Udry
• Wave IV Kathleen Mullan Harris

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Sampling Structure of Add Health
School Sampling Frame QED
HS
HS
HS
HS
HS
H
Feeder
Feeder
Feeder
Feeder
Feeder
Sampling Frame of Adolescents and Parents N
100,000 (100 to 4,000 per pair of schools)
Ethnic Samples
High Educ Black
Disabled Sample
Puerto Rican
Saturation Samples from 16 Schools
Chinese
Main Sample 200/Community
Cuban
Genetic Samples
Identical Twins
Full Sibs
Fraternal Twins
Half Sibs
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Longitudinal Design of Add Health
In-School Administration
In-Home Administration
School Admin 144
Adolescents in grades 7-12 20,745
Wave I 1994-1995 (78.9)
Parent 17,670
Students 90,118
School Admin 128
Wave II 1996 (88.2)
Adolescents in grades 8-12 14,738
Wave III 2001-2002 (77.4)
Young Adults Aged 18-26 15,197
Partners 1,507
Wave IV 2007-08 (80.0)
Adults Aged 24-32 15,500
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Questionnaire Content Across Waves

• Waves I, II
• Demographic
• Family, siblings, friends
• Education, work
• Physical and mental health
• Daily activities and sleep
• Relationships
• Sexual, fertility histories
• Substance use
• Delinquency and violence
• Attitudes, religion
• Economics, expectations
• Psychological, personality

• Wave III
• Demographic
• Family, siblings, friends
• Education, work, military
• Physical and mental health
• Daily activities and sleep
• Relationships
• Sexual, fertility histories
• Substance use
• Involvmt w/criminal justice sys
• Attitudes, religion
• Economics, expectations
• Psychological, personality
• Children and parenting
• Civic participation
• Gambling
• Mentoring

• Wave IV
• Demographic
• Family, siblings, friends
• Educ, work, military (records)
• Physical and mental health
• Daily activities and sleep
• Relationships
• Sexual, fertility histories
• Substance use and abuse
• Involvmt w/criminal justice sys
• religWork attitudes and chars,
• Economics, expectations
• Big 5 Personality, stressors
• Children and parenting
• Civic participation
• Psychosocial factors
• Cognitive function

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Biological Data Collection Across Waves
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Wave IV Locate and Interview Rates

• Data collection ended in January 2009
• Located 92 of sample members
• Interviewed 80 of eligible cases
• Wave IV sample size approximately 15,600

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Wave IV Biospecimen Participate Rates

• 96 of respondents consented to provide saliva
  for DNA
• 94 consented to provide blood spots
• For each specimen, 81 of those consenting to
  collection also consented to archiving
• Approximately 12,200 DNA samples available for
  further testing

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Accessing Add Health Data

• Add Health data are available in two formsa
  public-use data set and a restricted-use
  contractual data set
• Public-use data available from
• Inter-University Consortium for Political and
  Social Research (ICPSR)
• Sociometrics
• Instructions available on the Add Health Web Page

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Accessing Add Health Data

• Restricted-use contractual data set
• Currently available from Carolina Population
  Center
• Researchers must have an IRB-approved security
  plan
• In 2010, ICPSR will disseminate both data forms
• Changes in dissemination procedures
• Posted on Add Health web page
• Emailed to Add Health listserv

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Dissemination Accomplishments

• Data made available to more than 3,500
  investigators for analyses
• 300 grants awarded to analyze data
• 1,000 peer-reviewed publications
• Over 200 dissertations and masters theses using
  Add Health

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Add Health Web Page

• Online code books
• Manuscripts to inform data analysis
• Bibliography of Add Health publications
• Information about the bi-annual Add Health Users
  Conference in Washington DC
• Downloadable application/contract and
  instructions for data requests

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Add Health _at_ICPSR

• Distributed through Data Sharing for Demographic
  Research (cooperative agreement funded by NICHD)
• Free to the public with a MyData account
• Download public use directly from website
• Free user support at netmail_at_icpsr.umich.edu or
  dsdr_at_icpsr.umich.edu

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DSDR Add Health Data

• Current holdings include Waves I-III Public Use
  Files in SAS, STATA, SPSS format
• On-line analysis capability for all Public Use
  Files
• Original questionnaires and searchable PDF
  documentation
• Updated bibliographic citations with full text
  where available

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Data available

• Waves I and II
• Public Use Respondent files
• Sample Weight files
• Contextual files

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Data Available

• Wave III
• Public Use Data by Sections
• Peabody Picture Vocabulary Test Data
• Education Data
• Graduation Data
• Network Variables Data
• Grand Sample, Education, School, and Graduation
  Weights

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Add Health Documentation

• DSDR Codebooks
• Value and Variable Labels
• Question Text
• Add Health Documentation
• Add Health Codebooks
• Questionnaires
• User Guides
• Related Literature and Literature Search

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Add Health Online Data Analysis

• Wave I Public Use Data
• Wave II Public Use Data
• Wave III
• Peabody Picture Vocabulary Test Data
• Public Use Data (and by Section)
• Public Use Education Data
• Public Use Graduation Data
• Unweighted

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Add Health Online Analysis

• Powered by SDA
• Allow users to conduct searches and on-line
  analysis as well as generate extracts
• Extracts available in SAS, SPSS, STATA with
  custom codebooks
• Cannot link across datasets

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Coming in January 2010

• Wave IV public use data
• Restricted use data from all waves through
  on-line contracting system
• New Add health page _at_ DSDR