Study on Global Ageing and Adult Health 2014
Wave 2

Mexico, 2014

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Reference ID

MEX_2014_SAGE-W2_v01_M

Producer(s)

Mr. A. Salinas Rodriguez, Dr. B. Soledad Manrique Espinoza

Collection(s)

WHO’s Multi-Country Studies Programmes

Metadata

Documentation in PDF DDI/XML JSON

Study website

Created on

May 19, 2023

Last modified

May 19, 2023

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42394

Identification

Survey ID number

MEX_2014_SAGE-W2_v01_M

Title

Study on Global Ageing and Adult Health 2014

Subtitle

Wave 2

Country/Economy

Name	Country code
Mexico	MEX

Study type

World Health Survey [hh/whs]

Series Information

The Study on Global Ageing and Adult Health is the third round of the World Health Survey which was conducted in 2003.
SAGE surveys are designed by the World Health Organization and implemented by national agencies in participating countries.

Abstract

The multi-country Study on Global Ageing and Adult Health (SAGE) is run by the World Health Organization's Multi-Country Studies unit in the Health Systems and Innovation Cluster. SAGE is part of the unit's Longitudinal Study Programme which is compiling longitudinal data on the health and well-being of adult populations, and the ageing process, through primary data collection and secondary data analysis. SAGE baseline data (Wave 0, 2002/3) was collected as part of WHO's World Health Survey http://www.who.int/healthinfo/survey/en/index.html (WHS). SAGE Wave 2 (2014/15) provides a comprehensive data set on the health and well-being of adults in six low and middle-income countries: China, Ghana, India, Mexico, Russian Federation and South Africa.

Objectives:
To obtain reliable, valid and comparable health, health-related and well-being data over a range of key domains for adult and older adult populations in nationally representative samples
To examine patterns and dynamics of age-related changes in health and well-being using longitudinal follow-up of a cohort as they age, and to investigate socio-economic consequences of these health changes
To supplement and cross-validate self-reported measures of health and the anchoring vignette approach to improving comparability of self-reported measures, through measured performance tests for selected health domains
To collect health examination and biomarker data that improves reliability of morbidity and risk factor data and to objectively monitor the effect of interventions

Additional Objectives:
To generate large cohorts of older adult populations and comparison cohorts of younger populations for following-up intermediate outcomes, monitoring trends, examining transitions and life events, and addressing relationships between determinants and health, well-being and health-related outcomes
To develop a mechanism to link survey data to demographic surveillance site data
To build linkages with other national and multi-country ageing studies
To improve the methodologies to enhance the reliability and validity of health outcomes and determinants data
To provide a public-access information base to engage all stakeholders, including national policy makers and health systems planners, in planning and decision-making processes about the health and well-being of older adults

Methods:
SAGE's first full round of data collection included both follow-up and new respondents in most participating countries. The goal of the sampling design was to obtain a nationally representative cohort of persons aged 50 years and older, with a smaller cohort of persons aged 18 to 49 for comparison purposes. In the older households, all persons aged 50+ years (for example, spouses and siblings) were invited to participate. Proxy respondents were identified for respondents who were unable to respond for themselves. Standardized SAGE survey instruments were used in all countries consisting of five main parts: 1) household questionnaire; 2) individual questionnaire; 3) proxy questionnaire; 4) verbal autopsy questionnaire; and, 5) appendices including showcards. A VAQ was completed for deaths in the household over the last 24 months. The procedures for including country-specific adaptations to the standardized questionnaire and translations into local languages from English follow those developed by and used for the World Health Survey.

Content:
- Household questionnaire
0000 Coversheet
0100 Sampling Information
0200 Geocoding and GPS Information
0300 Recontact Information
0350 Contact Record
0400 Household Roster
0450 Kish Tables and Household Consent
0500 Housing
0600 Household and Family Support Networks and Transfers
0700 Assets and Household Income
0800 Household Expenditures
0900 Interviewer Observations

- Verbal Autopsy questionnaire
Section 1: Information on the Deceased and Date/Place of Death
Section 1A7: Vital Registration and Certification
Section 2: Information on the Respondent
Section 3A: Medical History Associated with Final Illness
Section 3B: General Signs and Symptoms Associated with Final Illness
Section 3E: History of Injuries/Accidents
Section 3G: Health Service Utilization
Section 4: Background
Section 5A: Interviewer Observations

- Individual questionnaire
1000 Socio-Demographic Characteristics
1500 Work History and Benefits
2000 Health State Descriptions
2500 Anthropometrics, Performance Tests and Biomarkers
3000 Risk Factors and Preventive Health Behaviours
4000 Chronic Conditions and Health Services Coverage
5000 Health Care Utilisation
6000 Social Networks
7000 Subjective Well-Being and Quality of Life (WHOQoL-8 and Day Reconstruction Method)
8000 Impact of Caregiving
9000 Interviewer Assessment

- Proxy Questionnaire
Section1 Respondent Characteristics and IQ CODE
Section2 Health State Descriptions
Section4 Chronic Conditions and Health Services Coverage
Section5 Health Care Utilisation

Kind of Data

Sample survey data [ssd]

Unit of Analysis

households and individuals

Version

Version Description

Version 01: Edited, anonymous dataset for public distribution.

Version Date

2015-07-01

Scope

Notes

The scope of the Study on Global Ageing and Adult Health includes:

Household: household characteristics, housing, household and family support, assets and household income, household expenditure.
Individual: socio demographic characteristics, work history, health state, anthropometrics, performance tests and biomarkers, risk factors, chronic conditions and health service coverage, health care utilisation, socialnetworks, subjective well-being and quality of life, caregiving.

Topics

Topic	Vocabulary
Study on Global Ageing and Adult Health (SAGE)	Survey

Keywords

Ageing, Alcohol, Asthma, Blindness, Cancer, Cataract, Cervical cancer, Chronic diseases, COPD, Depression, Diabetes, Diet, Disabilities, Epidemiology, Health financing, Health services, Health surveys, Health systems, Heart disease, Indoor air pollution, Injuries traffic, Mapping, Noncommunicable diseases, Nutrition, Obesity, Oral Health, Passive smoking, Physical activity, Poverty, Primary health care, Risk factors, Sanitation, Social determinants of health, Statistics, Stroke, Suicide, Tobacco, Visual impairment, Water

Coverage

Geographic Coverage

National coverage

Universe

The household section of the survey covered all households in 31 of the 32 federal states in Mexico. Colima was excluded. Institutionalised populations are excluded.
The individual section covered all persons aged 18 years and older residing within individual households. As the focus of SAGE is older adults, a much larger sample of respondents aged 50 years and older was selected with a smaller comparative sample of respondents aged 18-49 years.

Producers and sponsors

Primary investigators

Name	Affiliation
Mr. A. Salinas Rodriguez	Instituto Nacional de Salud Pública
Dr. B. Soledad Manrique Espinoza	Instituto Nacional de Salud Pública

Producers

Name	Affiliation	Role
Dr. M. Romero Martinez	Instituto Nacional de Salud Pública	Data collection manager
Mrs. A. Frank Nuñez	Instituto Nacional de Salud Pública	Field work manager

Funding Agency/Sponsor

Name	Role
US National Institute on Aging	Financial support through Interagency Agreements (OGHA 04034785; YA1323-08-CN-0020; Y1-AG-1005-01) and Grants (R01-AG034479; IR21-AG034263-0182)

Other Identifications/Acknowledgments

Name	Affiliation	Role
Dr. Richard Suzman	The National Institute on Aging's Division of Behavioral and Social Research	Dr Suzman was Instrumental in providing continuous intellectual and other technical support to SAGE and has made the entire endeavour possible

Sampling

Sampling Procedure

In Mexico strata were defined by locality (metropolitan, urban, rural). All 211 PSUs selected for wave 1 were included in the wave 2 sample. A sub-sample of 211 PSUs was selected from the 797 WHS PSUs for the wave 1 sample.
The Basic Geo-Statistical Areas (AGEB) defined by the National Institute of Statistics (INEGI) constitutes a PSU. PSUs were selected probability proportional to three factors:
a) (WHS/SAGE Wave 0 50plus): number of WHS/SAGE Wave 0 50-plus interviewed at the PSU,
b) (State Population): population of the state to which the PSU belongs,
c) (WHS/SAGE Wave 0 PSU at county): number of PSUs selected from the county to which the PSU belongs for the WHS/SAGE Wave 0
The first and third factors were included to reduce geographic dispersion. Factor two affords states with larger populations a greater chance of selection.

All WHS/SAGE Wave 0 individuals aged 50 years or older in the selected rural or urban PSUs and a random sample 90% of individuals aged 50 years or older in metropolitan PSUs who had been interviewed for the WHS/SAGE Wave 0 were included in the SAGE Wave 1 ''primary'' sample. The remaining 10% of WHS/SAGE Wave 0 individuals aged 50 years or older in metropolitan areas were then allocated as a ''replacement'' sample for individuals who could not be contacted or did not consent to participate in SAGE Wave 1. A systematic sample of 1000 WHS/SAGE Wave 0 individuals aged 18-49 across all selected PSUs was selected as the ''primary'' sample and 500 as a ''replacement'' sample.

This selection process resulted in a sample which had an over-representation of individuals from metropolitan strata; therefore, it was decided to increase the number of individuals aged 50 years or older from rural and urban strata. This was achieved by including individuals who had not been part of WHS/SAGE Wave 0 (which became a ''supplementary'' sample), although the household in which they lived included an individual from WHS/SAGE Wave 0. All individuals aged 50 or over were included from rural and urban ''18-49 households'' (that is, where an individual aged 18-49 was included in WHS/SAGE Wave 0) as part of the ''primary supplementary'' sample. A systematic random sample of individuals aged 50 years or older was then obtained from urban and rural households where an individual had already been selected as part of the 50 years and older or 18-49 samples. These individuals then formed part of the ''primary supplementary'' sample and the remainder (that is, those not systematically selected) were allocated to the ''replacement supplementary'' sample. Thus, all individuals aged 50 years or older who lived in households in urban and rural PSUs obtained for SAGE Wave 1 were selected as either a primary or replacement participant. A final ''replacement'' sample for the 50 and over age group was obtained from a systematic sample of all individuals aged 50 or over from households which included the individuals already selected for either the 50 and over or 18-49. This sampling strategy also provided participants who had not been included in WHS/SAGE Wave 0, but lived in a household where an individual had been part of WHS/SAGE Wave 0 (that is, the ''supplementary'' sample), in addition to follow-up of individuals who had been included in the WHS/SAGE Wave 0 sample.

Strata: Locality = 3
PSU: AGEBs = 211
SSU: Households = 6549 surveyed
TSU: Individual = 6342 surveyed

Response Rate

Household response rate was 83%.
Main reason for non-response was the inability to locate the household.

Individual response rate was 81%.

Weighting

Household weights(variable hhweight) for analysis at household level and individual weights(variable pweight) for analysis at person level were calculated. These were based on the selection probability at each stage of selection. Household weights were post-stratified by locality according to the 2009 population census projections.
Individual weights were post-stratified by sex and age-groups (18-34, 35-49, 50-59, 60-105) according to the 2009 population census projections.
Weights are divided by 1000 and are not normalized.

Survey instrument

Questionnaires

The questionnaires were based on the SAGE Wave 1 Questionnaires with some modification and new additions, except for verbal autopsy. SAGE Wave 2 used the 2012 version of the WHO Verbal Autopsy Questionnare. SAGE Wave 1 used an adapted version of the Sample Vital Registration iwth Verbal Autopsy (SAVVY) questionnaire.
A Household questionnaire was administered to all households eligible for the study.
A Verbal Autopsy questionnaire was administered to 50 plus households only. In follow-up 50 plus household if the death occured since the last wave of the study and in a new 50 plus household if the death occurred in the the past two years. Deceased had to be 50 years or more at the time of death.
An Individual questionniare was administered to eligible respondents identified from the household roster.
A Proxy questionnaire was administered to individual respondents who had cognitive limitations.
The questionnaires were developed in English. All documents were translated into Spanish. All SAGE generic English questionnaires are available as external resources.

Data collection

Dates of Data Collection

Start	End
2014-07-27	2014-10-14

Mode of data collection

Face-to-face [f2f], CAPI

Data Collectors

Name	Affiliation
Instituto Nacional de Salud Pública	Ministry of Health

Data Collection Notes

The pre-test for the study took place on 24 July 2014 in the municipality of Ocoyoacac in the state of Mexico. 14 household questionnaires were administed, 2 verbal autopsy, 16 individual, 1 proxy. Anthropometrics were obtained for 14 respondents.
No blood samples were taken.The pre-test data is not included in the final dataset.
There were 5 fieldwork teams. Each team was headed by a fieldwork coordinator who supervised one IT specialist and 2 supervisors. Each supervisor was responsible for 2 interviewers and one nurse.
A total of 5 coordinators, 10 supervisors, 5 IT specialists, 20 interviewers and 10 nurses comprised the fieldwork team.
Data collection took place over a period of about 12 weeks from 27 July until 14 October, 2014. Interviewing took place everyday throughout the fieldwork period.
Interviews were conducted in Spanish.

Data processing

Data Editing

Data editing took place at a number of stages including:
(1) office editing and coding
(2) during data entry
(3) structural checking of the FoxPro files
(4) range and consistency secondary edits in Stata

Data Access

Access authority

Name	Affiliation	URL	Email
Nirmala Naidoo	World Health Organization	http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/67	sagesurvey@who.int

Access conditions

The data is accessible under the following terms and conditions:

The data and other materials will not be redistributed or sold to other individuals, institutions, or organizations without the written agreement of The World Health Organization(WHO).
The data will be used for statistical and scientific research purposes only. And will be used solely for reporting of aggregated information, and not for investigation of specific individuals or organizations.
No attempt will be made to re-identify respondents, and no use will be made of the identity of any person or establishment discovered inadvertently. Any such discovery should be reported immediately to WHO.
No attempt will be made to produce links among datasets provided by the WHO Multi-Country Studies Data Archive, or among data from the WHO Multi-Country Studies Data Archive and other datasets that could identify individuals or organizations.
Any books, articles, conference papers, theses, dissertations, reports, or other publications that employ data obtained from the WHO Multi-Country Studies Data Archive will cite the source of data in accordance with the Citation Requirement provided with each dataset.
An electronic copy of all reports and publications based on the requested data will be sent to the The World Health Organization.

Instituto Nacional de Salud Pública(INSP), The World Health Organization(WHO) and the US National Institute on Aging(NIA) bear no responsibility for use of the data or for interpretations or inferences based upon such uses.

Citation requirements

Publications based on SAGE data should use the following acknowledgement: “This paper uses data from WHO's Study on Global Ageing and Adult Health (SAGE). SAGE is supported by the US National Institute on Aging through Interagency Agreements OGHA 04034785; YA1323-08-CN-0020; Y1-AG-1005-0) and through research grants R01-AG034479 and R21-AG034263 “.

Disclaimer and copyrights

Disclaimer

The data is being distributed without warranty of any kind.
The responsibility for the use of the data lies with the user.
In no event shall the World Health Organization be liable for damages arising from its use.

Contacts

Name	Affiliation	Email
Nirmala Naidoo	World Health Organization	sagesurvey@who.int

Metadata production

DDI Document ID

DDI_MEX_2014_SAGE-W2_v01_M