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Downloads of Add Health require submission of the following information, which is shared with the original producer of Add Health: supervisor name, supervisor email, and reason for download. A Data Guide for this study is available as a web page and for download.

The National Longitudinal Study of Adolescent to Adult Health (Add Health), 1994-2018 [Public Use] is a longitudinal study of a nationally representative sample of U.S. adolescents in grades 7 through 12 during the 1994-1995 school year. The Add Health cohort was followed into young adulthood with four in-home interviews, the most recent conducted 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.

Add Health Wave I data collection took place between September 1994 and December 1995, and included both an in-school questionnaire and in-home interview. The in-school questionnaire was administered to more than 90,000 students in grades 7 through 12, and gathered information on social and demographic characteristics of adolescent respondents, education and occupation of parents, household structure, expectations for the future, self-esteem, health status, risk behaviors, friendships, and school-year extracurricular activities. All students listed on a sample school's roster were eligible for selection into the core in-home interview sample. In-home interviews included topics such as health status, health-facility utilization, nutrition, peer networks, decision-making processes, family composition and dynamics, educational aspirations and expectations, employment experience, romantic and sexual partnerships, substance use, and criminal activities. A parent, preferably the resident mother, of each adolescent respondent interviewed in Wave I was also asked to complete an interviewer-assisted questionnaire covering topics such as inheritable health conditions, marriages and marriage-like relationships, neighborhood characteristics, involvement in volunteer, civic, and school activities, health-affecting behaviors, education and employment, household income and economic assistance, parent-adolescent communication and interaction, parent's familiarity with the adolescent's friends and friends' parents.

Add Health data collection recommenced for Wave II from April to August 1996, and included almost 15,000 follow-up in-home interviews with adolescents from Wave I. Interview questions were generally similar to Wave I, but also included questions about sun exposure and more detailed nutrition questions. Respondents were asked to report their height and weight during the course of the interview, and were also weighed and measured by the interviewer.

From August 2001 to April 2002, Wave III data were collected through in-home interviews with 15,170 Wave I respondents (now 18 to 26 years old), as well as interviews with their partners. Respondents were administered survey questions designed to obtain information about family, relationships, sexual experiences, childbearing, and educational histories, labor force involvement, civic participation, religion and spirituality, mental health, health insurance, illness, delinquency and violence, gambling, substance abuse, and involvement with the criminal justice system. High School Transcript Release Forms were also collected at Wave III, and these data comprise the Education Data component of the Add Health study.

Wave IV in-home interviews were conducted in 2008 and 2009 when the original Wave I respondents were 24 to 32 years old. Longitudinal survey data were collected on the social, economic, psychological, and health circumstances of respondents, as well as longitudinal geographic data. Survey questions were expanded on educational transitions, economic status and financial resources and strains, sleep patterns and sleep quality, eating habits and nutrition, illnesses and medications, physical activities, emotional content and quality of current or most recent romantic/cohabiting/marriage relationships, and maltreatment during childhood by caregivers. Dates and circumstances of key life events occurring in young adulthood were also recorded, including a complete marriage and cohabitation history, full pregnancy and fertility histories from both men and women, an educational history of dates of degrees and school attendance, contact with the criminal justice system, military service, and various employment events, including the date of first and current jobs, with respective information on occupation, industry, wages, hours, and benefits. Finally, physical measurements and biospecimens were also collected at Wave IV, and included anthropometric measures of weight, height and waist circumference, cardiovascular measures such as systolic blood pressure, diastolic blood pressure, and pulse, metabolic measures from dried blood spots assayed for lipids, glucose, and glycosylated hemoglobin (HbA1c), measures of inflammation and immune function, including High sensitivity C-reactive protein (hsCRP) and Epstein-Barr virus (EBV).

Wave V data collection took place from 2016 to 2018, when the original Wave I respondents were 33 to 43 years old. For the first time, a mixed mode survey design was used. In addition, several experiments were embedded in early phases of the data collection to test response to various treatments. A similar range of data was collected on social, environmental, economic, behavioral, and health circumstances of respondents, with the addition of retrospective child health and socio-economic status questions. Physical measurements and biospecimens were again collected at Wave V, and included most of the same measures as at Wave IV.

The overall goal of Wave VI was to better understand life course trajectories, determinants, and consequences of critical dimensions of aging, health, and health disparities among U.S. early midlife adults. Data collection took place from 2022 to 2025, with participants between the ages of 39 and 51, with an average age of 44. Beyond longitudinal survey measures, newly added questions included those on cumulative stress, discrimination, despair, work-life balance, memory, physical limitations, and caregiving. Continuing from previous waves, home exams collected physical measurements and biospecimens with most of the same measures as Wave V.

The National Congregations Study (NCS) is a national survey effort to gather information about America's congregations. The first wave of the NCS took place in 1998, and the study was repeated in 2006-07, 2012, and 2018-19. The NCS tracks continuity and change among American congregations, and each NCS wave also explores new subjects.

With information from 5,333 congregations collected over a span of more than 20 years, the NCS helps us better understand many aspects of congregational life in the United States, and how congregations are changing in the 21st century. The NCS contributes to knowledge about American religion by collecting information about a wide range of congregations' characteristics and activities at different points in time.

In all four waves, the NCS was conducted in conjunction with the General Social Survey (GSS). The 1998, 2006, 2012, and 2018 waves of the GSS asked respondents who attend religious services to name their congregation, thus generating a nationally representative sample of religious congregations. Researchers then located these congregations. In 2006, the sample included re-interviews of a subset of congregations that participated in 1998, and in 2018-19, the sample included re-interviews of a subset of congregations that participated in 2012.

A key informant at each congregation - a minister, priest, rabbi, or other staff person or leader - provided each congregation's information via a one-hour interview conducted either over the phone or in-person. The survey gathered information on many topics, including the congregation's leadership, social composition, structure, activities, and programming. The NCS gathers information about worship, programs, staffing, community activities, demographics, funding, and many other characteristics of American congregations. Respondents of the NCS survey were asked to describe the worship service and programs sponsored by the congregation other than the main worship services, including religious education classes, musical groups, and recreational programs. Informants described the type of building in which the congregation met, whether it belonged to the congregation, and whether visitors came just to view the building's architecture or artwork. Congregations were geocoded, and selected census variables are included in this study.

The American Time Use Survey (ATUS) is the Nation's first federally administered, continuous survey on time use in the United States. This multi-year data collection contains information on the amount of time (in minutes) that people spent doing various activities on a given day, including the arts activities, in the years 2003 through 2023.

Data collection for the ATUS began in January 2003. Sample cases for the survey are selected monthly, and interviews are conducted continuously throughout the year. In 2023, approximately 9,000 individuals were interviewed. Estimates are released annually. ATUS sample households are chosen from the households that completed their eighth (final) interview for the Current Population Survey (CPS), the nation's monthly household labor force survey. ATUS sample households are selected to ensure that estimates will be nationally representative. One individual age 15 or over is randomly chosen from each sampled household. This "designated person" is interviewed by telephone once about his or her activities on the day before the interview--the "diary day."

The ATUS Activity Coding Lexicon is a 3-tiered classification system with 17 first-tier categories. Each of the first-tier categories has two additional levels of detail. Respondents' reported activities are assigned 6-digit activity codes based on this classification system.

Additionally, the study provides demographic information--including sex, age, ethnicity, race, education, employment, and children in the household.

IMPORTANT: The 2020 ATUS was greatly affected by the coronavirus (COVID-19) pandemic. Data collection was suspended in 2020 from mid-March to mid-May. ATUS data files for 2020 contain all ATUS data collected in 2020--both before and after data collection was suspended. For more information, please visit BLS's ATUS page.

The weighting method was changed for 2020 to account for the suspension of data collection in early 2020 due to the COVID-19 pandemic. Respondents from 2020 will have missing values for the replicate weights on this data file. The Pandemic Replicate weights file for 2019-20 contains 160 replicate final weights for each ATUS final weight created using the 2020 weighting method. Chapter 7 of the ATUS User's Guide provides more information about the 2020 weighting method.

The Youth Development Study (YDS) was initiated as a school-based study of adolescent children and their parents to examine the consequences of formative experiences in adolescence for mental health, value formation, educational achievement, and multiple facets of behavioral adjustment. Particular attention was directed to the impacts of early work experience. Data were also obtained about parent-child and peer relationships and experiences in school. As the study continued, the focus shifted to adult development and attainment and, most recently, mid-life adjustment and health. This comprehensive longitudinal study now encompasses three generations: the initial cohort studied from adolescence to mid-life (G2), their parents (G1), and their adolescent children (G3). Data from three generations in the same families enable study of intergenerational relationships and differences in the experience of adolescence and transition to adulthood across parent and child cohorts. The YDS covers a wide range of topics of interest to sociologists, social psychologists, developmental psychologists, and life course scholars, including the development and impacts of agentic resources, socioeconomic attainment, processes of inter- and intra-generational mobility, objective and subjective work conditions, family relationships, intergenerational relationships, mental and physical health, and well-being.

In-school administration of paper surveys during the first four years of the study was supplemented by mailed surveys. Subsequent data collection took place entirely by mail, with 19 surveys conducted between 1988 and 2011. A final survey was conducted on-line in 2019. Survey data was obtained from the parents (G1) of this cohort during the first and fourth waves of the study (1988 and 1991). Surveys of the children (G3) began in 2009, continued in 2010 and 2011 (by mail) and in 2019-2020 (online).

The Youth Development Study measures a wide range of formative experiences and both psychological and behavioral variables, using survey methodology.

The G1 surveys obtained information about socioeconomic background as well as attitudes toward teenage employment, the parents' own employment as teenagers, their current work experiences, and educational expectations for their children.

The G2 surveys during the high school years included detailed questions about students' work and volunteer experiences, as well as experiences in their family, school, and peer groups, with an emphasis on the ways that working affected other life domains, mental health, and well-being. Shorter surveys containing many of the same topics were administered to students in 1992, 1993, and 1994, and included questions about current family and living arrangements. In 1995, a full survey was administered covering the wide range of topics included in previous surveys as well as information about career plans and life events that had occurred in the past five years. G2 Waves 9 through 19 (1997-2011) included many of the same questions contained in earlier surveys and additional sections that focused on the respondents' educational experiences, family relationships, sources of living expenses, and health and well-being. The most recent G2 survey (2019), administered on-line, included questions about support of aging parents. The YDS is unique in its coverage of both objective and subjective work experiences from adolescence to mid-life.

The topics covered by the G3 surveys are very similar to the G2 variables described above. Variables in each G2 and G3 wave are included in cross-wave codebooks, available at the Data Archive Codebook website.

For an overview of the Youth Development Study, see Mortimer, Jeylan T. (2012) "The Evolution, Contributions, and Prospects of the Youth Development Study: An Investigation in Life Course Social Psychology." Social Psychology Quarterly 75(1, March):5-27.

The Flint [Michigan] Adolescent Study (FAS): A Longitudinal Follow-Up Study of Substance Use on Adult Transitional Events, 2000-2003 collection includes data collected as part of four follow-up waves conducted for the Flint Adolescent Study (FAS). These data are waves five through eight, the original four waves can be found in ICPSR study 34598 (Flint [Michigan] Adolescent Study (FAS): A Longitudinal Study of School Dropout and Substance Use, 1994-1997.)

The Flint Adolescent Study (FAS) originally interviewed 850 ninth graders in the four public high schools of Flint, MI, between 1994 and 1997. Follow-up wave interviews were conducted four years after high school, between 2000 and 2003, as participants transitioned to young adulthood. The study was conducted in collaboration with the projects of Urban and Regional Affairs and Flint Community Schools. The goal of the study was to explore the protective factors associated with school dropout and alcohol and substance use. The study followed the youths for four years beginning in the Fall of 1994 to gather the first four waves of the study. The sample reflected the overall student body in the Flint high schools. In order to study those students most at risk for leaving school before graduation, individuals with grade point averages of 3.0 and below were selected.

Interviews were conducted face-to-face with each participant in a community location. Each interview took about one hour to complete. At the end of the interview students were asked to complete the last section of the questionnaire containing questions about their drug use and sexual behavior by themselves.

Information obtained from the participants include: participation in church and community organizations; social support and influence of family and friends; self-esteem and psychological wellbeing; delinquent and violent behaviors; alcohol and substance use; sexual behavior and child bearing; school attitudes and performance; and family structure and relationships. Many items included in the follow-up waves repeat those present in the original surveys. Questions were also asked about driving behavior, stress, and racial identity. Data was also collected about participant education and occupation.

Demographic variables in this collection include age, sex, race, education, occupation, employment history, residence type, household composition, height and weight, marital status, and number of children.

The Afrobarometer is a comparative series of public attitude surveys that collects and disseminates data regarding Africans' views on democracy, governance, the economy, civil society, and related issues. The data are collected from nationally representative samples in face-to-face interviews in the language of the respondent's choice. Standard topics for the Afrobarometer include attitudes toward and evaluations of democracy, governance and economic conditions, political participation, and national identity. In addition, Round 6 surveys included special modules on taxation; tolerance; crime, conflict and insecurity; political corruption; interregional relations; perceptions of China; use of technology; and social service delivery.

This particular data collection was concerned with the attitudes and opinions of the citizens of Gabon, and also includes a number of "country-specific questions" designed specifically for respondents of the Gabon survey. These "country-specific questions" solicited respondents' opinions on topics such as citizens' contact with their parliamentary senator, performance of senators, level of aid from Central African aid organizations, how oil revenues should be used, who has the right to citizenship in Gabon and solutions to youth unemployment.

The surveys also collect a large set of socio-demographic indicators such as age, gender, education level, poverty level, language and ethnicity, and religious affiliation, as well as political party affiliation. Afrobarometer Round 6 surveys were implemented in 36 countries.

This study of 656 respondents in the Detroit metropolitan area provides information on their religious attitudes and activities, as well as their economic and political attitudes and behavior. Respondents were asked about their belief in God and in life after death, the effects of their religious beliefs on their political beliefs, and the kinds of issues religious leaders should take a public stand on. Several questions probed respondents' views of other religious groups, as well as their attitudes on such issues as gambling, birth control, and the use of alcohol. Other topics covered include: information about respondents' economic behaviors such as saving and purchases on installment plans, respondents' opinions of government take-over of large industries and greater involvement in education and housing, respondents' attitudes toward income-earning work, science, degree of free speech, and racial equity, inter-group images, family and child-rearing patterns, welfare legislation, civil liberties, international relations, legislation on moral issues, doctrinal orthodoxy, devotionalism, and the effects of religion on politics as well as on daily life. Demographic variables specify age, sex, race, education, place of birth, marital status, number of children, length of time at present residence, religion, political party affiliation, income, occupation, original nationality of husband's and wife's family, home ownership, social class identification, and length of residence in the Detroit area.

The study was conducted during the spring and summer of 1971. The aim of the 1971 Detroit Area Study was to gather information on social change in the Detroit area by replicating items from nine earlier Detroit Area Studies that were conducted in 1953-1959, 1968, and 1969. The criteria used for selecting the question items were that they: (1) not be dated by wording or subject matter, (2) be relevant to some problem of current public concern or a continuing issue of sociological theory, and (3) be of the type that would be manageable in a long interview on diverse subjects. The questions chosen to be included in the 1971 Detroit Area Study examined issues such as values in marriage, ideal number of children, satisfaction of wives with marriage, decision-making and division of labor within a marriage, attitudes toward women and work, child-rearing, social participation, religious participation and beliefs, moral and job values, political orientation and participation, evaluation of various institutions, and racial attitudes. In addition to the items replicated from the previous studies, respondents' attitudes toward the United States sending troops to Vietnam were explored. Background variables established respondents' age, sex, race, educational level, marital status, occupation, class identification, and relationship to head of household. Demographic information was also collected on the respondent's spouse and parents.

For this survey, respondents from three counties in the Detroit, Michigan, area were queried about their social attitudes, racial attitudes, religion, community participation, and personal interactions. With respect to social attitudes, respondents' views were elicited on education, taxes, community service, participating in surveys, and privacy issues. Other questions closely examined respondents' attitudes toward African Americans in the Detroit area. Those queried were also asked to name community organizations they belonged to, and to list where in the Detroit area they went for shopping, medical care, entertainment, and recreation. Additional questions asked for detailed educational background information, religious attitudes, and place of worship. Background information includes marital status, employment, political orientation, and income.

For this survey, respondents from three counties in the Detroit, Michigan, area were queried about their work, health, marriage and family, finances, political views, religion, and child rearing. With respect to finances, respondent views were elicited on credit card purchases, recording expenditures, and savings and investments. Regarding political views, respondents were questioned about political preferences, presidential values, freedom of speech, nuclear war, and the interest of public officials. Questions also addressed religious beliefs and experiences, including the religiosity of respondents' parents, belief in and relationship with God, the relationship between science and religion, school prayer, divorce, and homosexuality. Additional religious questions -- based on the respondents' religious preference (i.e., Protestant, Catholic, Jew, Other Religion, or No Preference/Agnostic/Atheist Only) -- also were asked, covering topics such as interfaith marriages, religion of friends, and observance of religious holy days. Questions were asked about the views of respondents' religious leaders on issues including drinking, abortion, and test-tube fertilization. Regarding child rearing, views were elicited on issues including religious preference of child(ren) raised, religious training given to child(ren), and frequency of prayer before meals. Background information includes marital status, employment, political orientation, and income.

The 1987 Detroit Area Study is a replication of Gerhard Lenski's 1958 study on religion titled DETROIT AREA STUDY, 1958: THE RELIGIOUS FACTOR (ICPSR 7279). In addition to providing standard personal and demographic information such as age, sex, race, religion, marital status, and occupation, the survey also gathered data on the economic and political behavior of respondents and their kinship institutions, as well as the commitment of individuals to socio-religious groups. Questions tapped areas such as inter-group images, class and ethnic distinctions, family and child-rearing patterns, and attitudes toward work, unions, spending, saving, welfare legislation, civil liberties, foreign affairs, minority group rights, and legislation on moral issues. Questions on religion covered doctrinal orthodoxy, the role of religious leaders in politics, and the effect of religion on politics as well as daily life.