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The Toledo Adolescent Relationships Study (TARS) explores the relationship qualities and the subjective meanings that motivate adolescent behavior. More specifically, this study seeks to examine the nature and meaning of adolescent relationship experiences (e.g. with family, peers, and dating partners) in an effort to discover how experiences associated with age, gender, race, and ethnicity influence the meaning of dating relationships. The study further investigates the relative impact of dating partners and peers on sexual behavior and contraceptive practices, as well as involvement in other problem behaviors that can contribute independently to sexual risk-taking. The longitudinal design of the Toledo Adolescent Relationships Study (TARS) includes a schedule of follow-up interviews occurring one, three, five, ten, and about eighteen years after the initial interview. Additional waves have since been conducted.

Wave 2 of TARS includes data from follow-up surveys of adolescent respondents conducted approximately one year after the initial TARS survey. These data are accompanied by a series of weights for use in secondary analysis.

The Toledo Adolescent Relationships Study (TARS) explores the relationship qualities and the subjective meanings that motivate adolescent behavior. More specifically, this study seeks to examine the nature and meaning of adolescent relationship experiences (e.g. with family, peers, and dating partners) in an effort to discover how experiences associated with age, gender, race, and ethnicity influence the meaning of dating relationships. The study further investigates the relative impact of dating partners and peers on sexual behavior and contraceptive practices, as well as involvement in other problem behaviors that can contribute independently to sexual risk-taking. The longitudinal design of the Toledo Adolescent Relationships Study (TARS) includes a schedule of follow-up interviews occurring one, three, five, ten, and about eighteen years after the initial interview. Additional waves have since been conducted.

Wave 1 of TARS includes detailed data collected from both parents and adolescent respondents about their relationship experiences, including self-reported data from parents, parent-reported data about adolescent respondents, and self-reported data from adolescent respondents. These data are available as a combined dataset organized by adolescent respondent.

The Toledo Adolescent Relationships Study (TARS) includes several waves of data collection available through ICPSR. Please see the ICPSR Series page for available studies.

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 original Oregon Youth Study began in 1983. The goal is to examine the etiology of antisocial behaviors in boys, with a view to designing preventive interventions within the context of the family and the school. This longitudinal study has expanded over the past few decades into an intergenerational study, retaining the original young men and including their partners and children.

This study evaluates a comprehensive model for couples from at-risk backgrounds on the basis of a dynamic developmental systems approach and stress and support processes to examine the risk and protective impacts of romantic relationships on health in adulthood. It was posited that both general and specific developmental and relationship risks have significant implications for health outcomes in mid-adulthood. In addition, the course of intimate partner violence in early mid-adulthood is examined.

The original Oregon Youth Study began in 1983. The goal is to examine the etiology of antisocial behaviors in boys, with a view to designing preventive interventions within the context of the family and the school. This longitudinal study has expanded over the past few decades into an intergenerational study, retaining the original young men and including their partners and children.

This study evaluates a comprehensive model for couples from at-risk backgrounds on the basis of a dynamic developmental systems approach and stress and support processes to examine the risk and protective impacts of romantic relationships on health in adulthood. It was posited that both general and specific developmental and relationship risks have significant implications for health outcomes in mid-adulthood. In addition, the course of intimate partner violence in early mid-adulthood is examined.

The NCS-2 was a re-interview of 5,001 individuals who participated in the Baseline (NCS-1). The study was conducted a decade after the initial baseline survey. The aim was to collect information about changes in mental disorders, substance use disorders, and the predictors and consequences of these changes over the ten years between the two surveys. The collection contains four major sections: the main survey, demographic data, diagnostic data, and state, county, and tract FIPS data.

In the main survey, respondents were asked about general physical and mental health. Questions focused on a variety of health issues, including limitations caused by respondents' health issues, substance use, childhood health, life-threatening illnesses, chronic conditions, medications taken in the past 12 months, level of functioning and symptoms experienced in the past 30 days, and any services used by the respondents since the (NCS-1). Additional questions focused on mental disorders including depression, bipolar disorder, specific and social phobias, generalized anxiety, intermittent explosive disorder, suicidality, post-traumatic stress disorder, neurasthenia, pre-menstrual dysphoric disorder, attention deficit/hyperactivity disorder, oppositional defiant disorder, conduct disorder, and separation anxiety. Respondents were also asked about their lives in general, with topics including employment, finances, marriage, children, their social lives, and stressful life events experienced in the past 12 months. Additionally, two personality assessments were included consisting of respondents' opinions on whether various true/false statements accurately described their personalities. Another focus of the main survey dealt with substance use and abuse, nonmedical use of prescription drugs, and polysubstance use. Interview questions in the NCS-2 Main Survey were customized to each respondent based on previous responses in the Baseline (NCS-1).

The second part contains demographic and other background information including age, education, employment, household composition, household income, marital status, and region.

The third part focuses on whether respondents met diagnostic criteria for psychological disorders asked about in the main survey.

The fourth part contains respondents' state, county, and tract FIPS data.

The Michigan Longitudinal Study (MLS) is a long-term multi-project collaboration to describe the interaction of behavior, social influence, brain vulnerability, and genetic risk, as they create the development of risk for, or resilience against the abuse of substances, and as they continue to have impact on health throughout the lifespan. The project's special focus is to archive the real-time observational data collected initially on VHS videotapes and converted to MP4 video format. A total of 2238 social interactional videotapes were recorded involving the Eyberg Parent-Child interaction task carried out separately with each parent, a standardized marital interaction problem solving task, a standardized family interaction task, and undetermined interaction tasks. The current digital video data is a small portion of the overall project database that permits analysis of microlevel social interaction with facial and emotional display characteristics and the examination of its long-term predictive power from childhood to adulthood.

This collection contains data from the Multi-site Family Study on Incarceration, Parenting and Partnering [MSF-IP]. The MSF-IP is an evaluation of a grant program funded by the Office of Family Assistance (OFA) within the U.S. Department of Health and Human Services (HHS), Administration for Children and Families (ACF) to promote or sustain healthy relationships and to strengthen families in which a father was incarcerated or otherwise involved with the criminal justice system (e.g., recently released or on parole or probation). From 2006-2011, grantees were required to serve justice-involved fathers and their committed partners with services to promote healthy marriage; they were also permitted to provide activities to support parenting and foster economic stability.

The MFS-IP evaluation was funded to document program implementation and the impact of programming on outcomes such as relationship quality and stability, parenting and co-parenting, family financial well-being, and recidivism. This collection includes data from the impact study, conducted across five grantees: the Indiana Department of Correction, the RIDGE Project (Ohio), the New Jersey Department of Corrections, the Osborne Association (New York), and the Minnesota Council on Crime and Justice. The collection includes de-identified interview data for 1,991 men and 1,482 intimate and co-parenting partners.

The interviews took place from December 2008 through August 2014. Couples were first interviewed during the male partner's incarceration (with the timing of baseline interviews not related to the man's admission or release date in most sites) and then interviewed again nine and 18 months after baseline. In the two largest sites (Indiana and Ohio), an additional 34-month follow-up interview was conducted. The interviews were similar in content at each interview wave and for the male and female interviews, but differed based on male partner's trajectory of incarceration and release over the follow-up period.

Topics within this collection include demographics, personal characteristics and attitudes, criminal history and behavior, incarceration experiences (including family contact during incarceration), program and service receipt, expectations for release, family structure and functioning, intimate relationship quality, parenting and co-parenting quality, child well-being, employment, housing, substance use, and experiences with reentry.

Tsogolo la Thanzi (TLT) is a longitudinal study in Balaka, Malawi designed to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. This data was collected to develop better understandings of the reproductive goals and behavior of young adults in Malawi -- the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every four months at TLT's centralized research center. Data collection began in May of 2009 and was completed in June of 2012. To assess changes on a longer time horizon, a follow-up survey we refer to as Tsogolo la Thanzi 2 (TLT-2) was fielded between June and August of 2016.

This study contains data collected from the second wave of the multi-wave study.

Each wave is comprised of three data files. The Women dataset (dataset 1) is a random sample of women aged 15-25 in 2009 (N=1,505 at wave 1), drawn from a census of the area. Likewise, the Random Men dataset (dataset 3) is a random-sample of men aged 15-25 in 2009 (N=574 at wave 1) drawn from a census of the area. The Male Partners dataset (dataset 2) contains survey data from sexual and romantic partners who were referred into the study by respondents in the women's file; this is a non-random sample of male partners, so analysts should be especially cautious with inferences.

Topics covered across all waves include relationships, religion, HIV/AIDS, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, future expectations, school enrollment status, goods purchased/received, and diet.

Modules specific to wave 2 include: two-year future expectations. Additionally, the child roster, household roster, and travel for interview sections begin at wave 2.

Additional demographic variables in each dataset include age and education.

Tsogolo la Thanzi (TLT) is a longitudinal study in Balaka, Malawi designed by Jenny Trinitapoli and Sara Yeatman to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. The TLT research team has collected data to better understand the reproductive goals and behavior of young adults in Malawi. This is the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every fourth month at TLT's centralized research center. Data collection began in May of 2009 and was completed in December 2011 (waves 1-8).

In addition, a Refresher Sample (wave 9) was fielded in early 2012 as a form of addressing study attrition but also to create the ability to compare the "treatment" effect of survey participation on respondents who participated in waves 1-8.

The Refresher Sample includes 315 women who were sampled but not enrolled at wave 1 (baseline), and thus only entered the study in 2012. Furthermore, to assess changes on a longer time-horizon, a follow-up survey referred to as TLT-2 was fielded between June and August of 2016 which includes all baseline and comparison sample women, plus all men ever-interviewed for the study.

Each of waves 1-8 are comprised of three data files: women, random men, and male partners. However, wave 9 includes only a sample of women who did not enroll in baseline (N=315).

Topics covered across all waves include relationships, religion, HIV/AIDS, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, future expectations, school enrollment status, goods purchased/received, and diet. Of the occasional modules, those included at wave 9 [Refresher Sample] are: background, residency and migration, travel and parent information. Otherwise, the comparison sample is more similar to the baseline wave, relative to other rounds of data collection.

Tsogolo la Thanzi (TLT) is a longitudinal study in Balaka, Malawi designed to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. New data is being collected to develop better understandings of the reproductive goals and behavior of young adults in Malawi -- the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every four months at TLT's centralized research center. Data collection began in May of 2009 and was completed in June of 2012. To assess changes on a longer time-horizon, a follow-up survey referred to as Tsogolo la Thanzi 2 (TLT-2) was fielded between June and August of 2016.

This study contains data collected from the eighth wave of the multi-wave study.

Each of waves 1-8 is comprised of three data files. The Women dataset (dataset 1) is a random sample of women aged 15-25 in 2009 (N=1,505 at wave 1) drawn from a census of the area. Likewise, the Random Men dataset (dataset 3) is a random sample of men aged 15-25 in 2009 (N=574 at wave 1) drawn from a census of the area. The Male Partners dataset (dataset 2) contains survey data from sexual and romantic partners who were referred into the study by respondents in the women's file; this is a non-random sample of male partners, so analysts should be especially cautious with inferences.

Topics covered across all waves include relationships, religion, HIV/AIDS, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, future expectations, school enrollment status, goods purchased/received, and diet.

Modules specific to wave 8 include: health services, travel, treatment optimism, and parent information.

Additional demographic variables in each dataset include age and education.

Tsogolo la Thanzi (TLT) is a longitudinal study in Balaka, Malawi designed to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. New data is being collected to develop better understandings of the reproductive goals and behavior of young adults in Malawi -- the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every four months at TLT's centralized research center. Data collection began in May of 2009 and was completed in June of 2012. To assess changes on a longer time-horizon, a follow-up survey referred to as Tsogolo la Thanzi 2 (TLT-2) was fielded between June and August of 2016.

This study contains data collected from the fifth wave of the multi-wave study.

Each wave is comprised of three data files. The Women dataset (dataset 1) is a random sample of women aged 15-25 in 2009 (N=1,505 at wave 1) drawn from a census of the area. Likewise, the Random Men dataset (dataset 3) is a random sample of men aged 15-25 in 2009 (N=574 at wave 1) drawn from a census of the area. The Male Partners dataset (dataset 2) contains survey data from sexual and romantic partners who were referred into the study by respondents in the women's file; this is a non-random sample of male partners, so analysts should be especially cautious with inferences.

Topics covered across all waves include relationships, religion, HIV/AIDS, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, future expectations, school enrollment status, goods purchased/received, and diet.

Modules specific to wave 5 include: best friend characteristics, health services, relationship power, relationship scripts, treatment optimism and travel.

Additional demographic variables in each dataset include age and education.

Tsogolo la Thanzi (TLT) is a longitudinal study in Balaka, Malawi designed to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. New data is being collected to develop better understandings of the reproductive goals and behavior of young adults in Malawi -- the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every four months at TLT's centralized research center. Data collection began in May of 2009 and was completed in June of 2012. To assess changes on a longer time-horizon, a follow-up survey referred to as Tsogolo la Thanzi 2 (TLT-2) was fielded between June and August of 2016.

This study contains data collected from the sixth wave of the multi-wave study.

Each wave is comprised of three data files. The Women dataset (dataset 1) is a random sample of women aged 15-25 in 2009 (N=1,505 at wave 1) drawn from a census of the area. Likewise, the Random Men dataset (dataset 3) is a random sample of men aged 15-25 in 2009 (N=574 at wave 1) drawn from a census of the area. The Male Partners dataset (dataset 2) contains survey data from sexual and romantic partners who were referred into the study by respondents in the women's file; this is a non-random sample of male partners, so analysts should be especially cautious with inferences.

Topics covered across all waves include relationships, religion, HIV/AIDS, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, future expectations, school enrollment status, goods purchased/received, and diet.

Modules specific to wave 6 include: best friend characteristics, treatment optimism, travel, and health services.

Additional demographic variables in each dataset include age and education.

Tsogolo la Thanzi (TLT) is a longitudinal study in Balaka, Malawi designed to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. New data is being collected to develop better understandings of the reproductive goals and behavior of young adults in Malawi -- the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every four months at TLT's centralized research center. Data collection began in May of 2009 and was completed in June of 2012. To assess changes on a longer time-horizon, a follow-up survey referred to as Tsogolo la Thanzi 2 (TLT-2) was fielded between June and August of 2016.

This study contains data collected from the fourth wave of the multi-wave study.

Each wave is comprised of three data files. The Women dataset (dataset 1) is a random sample of women aged 15-25 in 2009 (N=1,505 at wave 1), drawn from a census of the area. Likewise, the Random Men dataset (dataset 3) is a random-sample of men aged 15-25 in 2009 (N=574 at wave 1) drawn from a census of the area. The Male Partners dataset (dataset 2) contains survey data from sexual and romantic partners who were referred into the study by respondents in the women's file; this is a non-random sample of male partners, so analysts should be especially cautious with inferences.

Topics covered across all waves include relationships, religion, HIV/AIDS, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, future expectations, school enrollment status, goods purchased/received, and diet.

Additional demographic variables in each dataset include age and education.

Tsogolo la Thanzi (TLT) is a longitudinal study in Balaka, Malawi designed to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. New data is being collected to develop better understandings of the reproductive goals and behavior of young adults in Malawi -- the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every four months at TLT's centralized research center. Data collection began in May of 2009 and was completed in June of 2012. To assess changes on a longer time-horizon, a follow-up survey referred to as Tsogolo la Thanzi 2 (TLT-2) was fielded between June and August of 2016.

This study contains data collected from the third wave of the multi-wave study.

Each wave is comprised of three data files. The Women dataset (dataset 1) is a random sample of women aged 15-25 in 2009 (N=1,505 at wave 1), drawn from a census of the area. Likewise, the Random Men dataset (dataset 3) is a random-sample of men aged 15-25 in 2009 (N=574 at wave 1) drawn from a census of the area. The Male Partners dataset (dataset 2) contains survey data from sexual and romantic partners who were referred into the study by respondents in the women's file; this is a non-random sample of male partners, so analysts should be especially cautious with inferences.

Topics covered across all waves include relationships, religion, HIV/AIDS, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, future expectations, school enrollment status, goods purchased/received, and diet.

Modules specific to wave 3 include: relationship power.

Additional demographic variables in each dataset include age and education.

The Tsogolo La Thanzi (TLT): Baseline Wave collection contains data collected as part of the Tsogolo la Thanzi (TLT) Study. TLT is a longitudinal study in Balaka, Malawi designed to examine how young people navigate reproduction in an AIDS epidemic. Tsogolo la Thanzi means "Healthy Futures" in Chichewa, Malawi's most widely spoken language. New data is being collected to develop better understandings of the reproductive goals and behavior of young adults in Malawi -- the first cohort to never have experienced life without AIDS. To understand these patterns of family formation in a rapidly changing setting, TLT used the following approach: an intensive longitudinal design where respondents are interviewed every fourth months at TLT's centralized research center. Data collection began in May of 2009 and was completed in June of 2012. To assess changes on a longer time-horizon, a follow-up survey we refer to as Tsogolo la Thanzi 2 (TLT-2) was fielded between July and October of 2015.

The Women dataset (dataset 1) contains variables that pertain to pregnancy, family composition, partners and relationships, mental health, marriage, sex and protection, sexually transmitted diseases, goods purchases, and diet.

The Male Partners dataset (dataset 2) contains variables that pertain to relationships, religion, politics, family composition, mental health, sex and protection, pregnancy, marriage, sexually transmitted diseases, goods purchases, and diet.

The Random Men dataset (dataset 3) asked respondents about their mental health, partners and relationships, sexually transmitted diseases, sex and protection, family composition, goods purchases, and diet.

The Male Partners at Alternative Waves dataset (dataset 4) includes baseline data collected for male partners who began participating in the study between Wave 2 and Wave 8. If male partners entered the study at Wave 2 or later, their first interview was the baseline questionnaire (Wave 1), and at the next round of data collection they received the current wave's questionnaire. This dataset includes variables that pertain to relationships, religion, mental and physical health, family composition, sex and protection, fatherhood, marriage, sexually transmitted diseases, good purchases and diet.

Demographic variables in each dataset include age, tribe, language, and education.

The NCS-2 was a re-interview of 5,001 individuals who participated in the Baseline (NCS-1). The study was conducted a decade after the initial baseline survey. The aim was to collect information about changes in mental disorders, substance use disorders, and the predictors and consequences of these changes over the ten years between the two surveys. The collection contains three major sections: the main survey, demographic data, and diagnostic data.

In the main survey, respondents were asked about general physical and mental health. Questions focused on a variety of health issues, including limitations caused by respondents' health issues, substance use, childhood health, life-threatening illnesses, chronic conditions, medications taken in the past 12 months, level of functioning and symptoms experienced in the past 30 days, and any services used by the respondents since the (NCS-1). Additional questions focused on mental disorders including depression, bipolar disorder, specific and social phobias, generalized anxiety, intermittent explosive disorder, suicidality, post-traumatic stress disorder, neurasthenia, pre-menstrual dysphoric disorder, attention deficit/hyperactivity disorder, oppositional defiant disorder, conduct disorder, and separation anxiety. Respondents were also asked about their lives in general, with topics including employment, finances, marriage, children, their social lives, and stressful life events experienced in the past 12 months. Additionally, two personality assessments were included consisting of respondents' opinions on whether various true/false statements accurately described their personalities. Another focus of the main survey dealt with substance use and abuse, nonmedical use of prescription drugs, and polysubstance use. Interview questions in the NCS-2 Main Survey were customized to each respondent based on previous responses in the Baseline (NCS-1).

The middle section contains demographic and other background information including age, education, employment, household composition, household income, marital status, and region.

The last section of the collection focused on whether respondents met diagnostic criteria for psychological disorders asked about in the main survey.

This data collection contains the first four waves of the Iowa Youth and Families Project (IYFP), conducted in 1989, 1990, 1991, and 1992. The Iowa Youth and Families Project was developed from an initial sample of 451 7th graders from two-parent families in rural Iowa. The study was merged with the Iowa Single Parent Project (ISPP) to form the Iowa Family Transitions Project in 1994, when the target youth were seniors in high school. Survey data were collected from the target child (7th grader), a sibling within four years of age of the target child, and both parents. Field interviewers visited families at their homes on several occasions to administer questionnaires and videotape interaction tasks including family discussion tasks, family problem-solving tasks, sibling interaction tasks, and marital interaction tasks.

The Household Data files contain information about the family's financial situation, involvement in farming, and demographic information about household members.

The Parent and the Child Survey Data files contain responses to survey questions about the quality and stability of family relationships, emotional, physical, and behavioral problems of individual family members, parent-child conflict, family problem-solving skills, social and financial support from outside the home, traumatic life experiences, alcohol, drug, and tobacco use, and opinions on topics such as abortion, parenting, and gender roles. In addition, the Child Survey Data files include responses collected from the target child and his or her sibling in the study about experiences with puberty, dating, sexual activity, and risk-taking behavior.

The Problem-Solving Data files contain survey data collected from respondents about the family interactions tasks.

The Observational Data files contain the interviewers' observations collected during these tasks.

Demographic variables include sex, age, employment status, occupation, income, home ownership, religious preference, frequency of religious attendance, as well as the ages and sex of all household members and their relationship to the head of household. Demographic information collected on the parents also includes their birth order within their family, the ages and political philosophy of their parents, the sex, age, education level, and occupation of their siblings, and the country of origin of their ancestors.