Study Search Results Your query returned 4 results. Series results are grouped under the most relevant study. You can ungroup series results. Results per page: 25 50 100 Sort by: Study Relevance Title A-Z Released/Updated Time Period Most Cited in ICPSR Bib. Variable Relevance (?) Study Title/Investigator 1. National Longitudinal Study of Adolescent to Adult Health (Add Health), 1994-2008 [Public Use] (ICPSR 21600) Harris, Kathleen Mullan; Udry, J. Richard 2. Drug Abuse Treatment Outcome Study--Adolescent (DATOS-A), 1993-1995: [United States] (ICPSR 3404) United States Department of Health and Human Services. National Institutes of Health. National Institute on Drug Abuse 3. Project on Human Development in Chicago Neighborhoods (PHDCN): Substance Use, Wave 1, 1994-1997 (ICPSR 13602) Earls, Felton J.; Brooks-Gunn, Jeanne; Raudenbush, Stephen W.; et al. 4 more results in Project on Human Development in Chicago Neighborhoods (PHDCN) Series 4. Iowa Youth and Families Project, 1989-1992 (ICPSR 26721) Conger, Rand D.; Lasley, Paul; Lorenz, Frederick O.; et al.