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MHAS: Study Overview
The MHAS is a longitudinal study of people aged 50 and older and their partners, living in private households in Mexico. Its main goal is to use a wide socioeconomic perspective to examine the aging process and the disease and disability burden in older adults. The survey elicits information about demographics, health, migration, family structure, health care use and costs, income, assets, housing, and cognition.
The MHAS includes a nationally representative sample of the population aged 50 years and older living in private households in Mexico. The sample has national and urban/rural representation. The initial sample was recruited in 2001 from households that had participated in the National Employment Survey (Encuesta Nacional de Empleo, ENE) in 2000.
|Age Eligibility||Age 50 and older|
|People Interviewed per Household||One selected person per household (plus spouse if any)|
|Spouse Inclusion||Spouse of any age|
|Representativeness||Nationally and urban/rural representative|
|Oversampling||Households in the six states which account for 40% of all migrants to the USA|
The MHAS core interview was carried out in 2001 with follow-up interviews in 2003, 2012, 2015, 2018 and 2021 through face-to-face interviews, using computer-assisted personal interviewing (CAPI) since 2012.
In addition to the core interview, MHAS also collects a number of other types of data.
|End of Life Interview||Conducted starting at Wave 2 with next-of-kin knowledgeable about deceased respondents.|
|Anthopometric and Performance Measures||Conducted at Waves 1, 2, and 3 among a sub-sample of respondents.|
|Blood-Based Biomarkers||Venous blood was drawn at Waves 3 and 4 among a sub-sample of respondents. Capillary blood was collected at Wave 3 among a sub-sample of respondents.|
|Salivary Biomarkers||Saliva was collected at Wave 5 among respondents aged 60 and older.|
|Noninvasive Biomarkers||Hair was collected at Wave 5 among a sub-sample of respondents.|
|Cognitive Assessment||Conducted in every wave. In addition, an in-depth cognitive sub-study of MHAS called the Cognitive Aging Ancillary Study (Mex-Cog) used the Harmonzied Cognitive Assessment Protocol (HCAP) on a sub-sample of respondents. Wave 1 of the Mex-Cog included those age 55 and older in 2016. Wave 2 of the Mex-Cog included those age 58 and older in 2021.|
The MHAS Wave 1 sample included 11,000 selected households containing 16,540 individuals and their spouses. Since then, the MHAS sample has been refreshed at waves 3 and 5. When the Wave 3 refreshment sample was drawn, households from the National Employment and Occupation Survey (Encuesta Nacional de Ocupacion y Empleo, ENOE) were selected if they had a respondent between the ages of 50 and 60. When the Wave 5 refreshment sample was drawn, households from the National Household Sampling Frame (Marco Nacional de Viviendas) were selected if they had a respondent between the ages of 50 and 55.
The MHAS included linkages to administrative data. The MHAS team has created linked datasets to answer specific research questions. Access to these datasets requires approval from the MHAS team.
|Community-level characteristics||National Institute of Statistics and Geography (INEGI), Mexican Ministry of Health|
|Mortality data||Mexican Ministry of Health, INEGI|
|Seguro Popular enrollment||Mexican Ministry of Health, National Population Council (CONAPO)|
|Historical data on air pollution||National Institute of Ecology and Climate Change (INECC)|
|Literacy rates||Historical Census 1910-1990|
|Social programs enrollment including Progresa/Oportunidades, 70+/Pension, and Seguro Popular||CONAPO, INEGI, Progresa/Oportunidades, 70+/Pension, Seguro Popular|
Public access MHAS data can be downloaded from the study website. Unlinked data are anonymized and only require registration with the MHAS. Access to linked data requires additional approval.
End of life interview
Seguro Popular enrollment
Historical data on air pollution
Social programs enrollment, including Progresa/Oportunidades, 70+/Pension, and Seguro Popular
Available via request though:
The Gateway to Global Aging Data has created several user-friendly datasets based on MHAS data designed to allow researchers to conduct cross-wave and cross-study analysis.
|Harmonized MHAS||A dataset of research-ready variables derived from the core interviews and health assessments of Waves 1-5.||Download via MHAS website|
|Harmonized MHAS End of Life||A dataset of research-ready variables derived from the end of life interviews of Waves 2-4.||Download via MHAS website|
|Harmonized Mex-Cog||A dataset of research-ready variables derived from the Cognitive Aging Ancillary Study (Mex-Cog).||Coming soon|
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