Major Surveys:

Six major projects associated with CDHA are the Wisconsin Longitudinal Survey (WLS), the Mexican Health and Aging Study (MHAS), the National Survey of Families and Households (NSFH), the Puerto Rican Elderly Health Conditions (PREHCO), Health, Wellbeing and Aging in Latin America and the Caribbean (SABE), and Wisconsin Assets and Income Studies (WAIS). CDHA also provides support for new faculty development and for faculty, staff, and research assistants engaged in innovative pilot projects that are likely to lead to major NIA support.

Wisconsin Longitudinal Study (WLS)

The Wisconsin Longitudinal Study is a long-term study of a random sample of 10,317 men and women who graduated from Wisconsin high schools in 1957 and of their randomly selected brothers and sisters. Survey data were collected from the original respondents or their parents in 1957, 1964, 1975, and 1992 and a selected sibling in 1977 and 1993. These data provide a full record of social background, youthful aspirations, schooling, military service, family formation, labor market experiences, and social participation of the original respondents. A major round of data collection started in the fall of 2002. For details concerning completed survey rounds, visit the WLS website,

The Mexican Health and Aging Study (MHAS)

The Mexican Health and Aging Study started as a prospective panel study of health and aging in Mexico. The baseline survey, with national and urban/rural representation of adults born in 1951 or earlier, was conducted in the summer of 2001 and a follow-up was fielded in the summer of 2003. The MHAS aimed to create a longitudinal prospective study of Mexican aging, using study protocols and survey instruments that were highly comparable to the U.S. Health and Retirement Study. The Mexican Health and Aging Study will design and field the 3rd and 4th waves of survey data collection in Mexico. The two waves will be fielded in 2012 and 2014, including follow-up to the study sample and innovations in study methodology. The study is funded by the National Institute on Aging (NIA/NIH R01 AG018016). More information about this study is available at

National Survey of Families and Households (NSFH)

In the initial wave in 1987-88 (NSFH-1), 13,007 respondents were interviewed. The national sample included a main cross-section of 9,637 households plus an oversampling of blacks, Puerto Ricans, Mexican Americans, single-parent families, families with stepchildren, cohabiting couples and recently married persons. One adult per household was randomly selected as the primary respondent. In addition, a shorter self-administered questionnaire was given to the spouse or cohabiting partner of the primary respondent. In the second round conducted in 1992-94 (NSFH-2), the spouse or cohabiting partner was given essentially the same interview as the main respondent. The third survey round (NSFH-3) was fielded in 2001-2003. For details, visit the NSFH website,

The Puerto Rican Elderly Health Conditions (PREHCO)

The Puerto Rican Elderly Health Conditions project investigates health conditions of older adults (aged 60+) in Puerto Rico through an island-wide, cross-sectional sample survey of target individuals and their surviving spouses. In the future, we hope to complement the survey with (i) a follow-up to take place four to five years after the baseline, (ii) a record linkage to Medicare/Medicaid records for the entire sample (iii) a record linkage to death certificates for decedent who die who die in the interwave period, and (iv) a sample of randomly selected siblings of target individuals. For a more detailed description of the PREHCO project please see this PREHCO methods report. This document is now in Spanish but is in the process of being translated into English. Data and documents for PREHCO1, 2002-2003 and PREHCO2, 2004-2006 are now available from BADGIR site, Please note PREHCO2 is a preliminary release. To learn more about PREHCO project, visit the PREHCO website,

Health, Wellbeing and Aging in Latin America and the Caribbean (SABE)

SABE (Salud, Bienestar y Envejecimiento en America Latina y el Caribe) is a cross-national survey on health and aging organized as a cooperative venture among researchers from 8 countries in the Americas with funding from a variety of national and international organizations. SABE is the first cross-national database for studying pension and retirement systems, the composition of the labor force, family living arrangements, inter-generational intra-family transfers, and the health of the elderly. For more information, contact

Wisconsin Assets & Income Studies (WAIS)

The Wisconsin Assets and Incomes Studies (WAIS) merges data on a random sample of individuals who filed taxes in the State of Wisconsin between 1959 and 1964 with data from a number of administrative sources including the Social Security Administration and probate data. The data describe the economic and demographic characteristics of sampled subjects making it possible to reconstruct career history, the life cycle of earnings, marital history, and investment portfolios. For more information, visit the WAIS website,