Individual Study / SAGE

WHO Study on Global Ageing and Adult Health

WHO Study on Global Ageing and Adult Health

SAGE logo
Initiatives -
WHO's SAGE is a longitudinal study collecting data on adults aged 50 years and older, plus a smaller comparison sample of adults aged 18–49 years, from nationally representative samples in China, Ghana, India, Mexico, Russian Federation and South Africa. This study was created to improve the empirical understanding of the health and well-being of older adults and ageing in less developed countries, as part of a survey programme at WHO designed to develop a reliable data collection platform and data collection methods that improve comparability of data across countries.
Start Year
2002
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Members

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Investigators Contacts
  • Somnath Chatterji
    World Health Organization

Design

Study design
Population cohort
Follow Up
Participants were assessed in 2002-2004 (wave 0), 2007–2010 (wave 1), 2014/15 (wave 2), and wave 3 will be implemented in 2017.
Supplementary Information
All six countries implemented a multistage cluster sampling design resulting in nationally representative cohorts. Household-level analysis weights and person-level analysis weights, which included sample selection and a post-stratification factor, were calculated for each country. Post stratification used the most recent estimates provided by the national statistical offices of the respective countries.

Marker Paper

Kowal, P. et al. Data Resource Profile: The World Health Organization Study On Global Ageing And Adult Health (SAGE). International Journal of Epidemiology 41.6 (2012): 1639-1649.

PUBMED 23283715

Recruitment

Sources of Recruitment
  • Individuals

Number of participants

Number of participants
63,437
Number of participants with biosamples
63,437

Access

Availability of data and biosamples

Data
Biosamples
Other

Availability of access information

On the study website : http://www.who.int/healthinfo/sage/en/

Timeline

Populations

The household section of the survey covered all households in all nine provinces in South Africa. 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 were selected with a smaller comparative sample of respondents aged 18-49 years.
Selection Criteria
Minimum age
18
Newborns
Twins
Countries
  • South Africa
Ethnic Origin
Health Status

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample

Number of participants

Number of participants
4,223
Number of participants with biosamples
Data Collection Event
Data was collected for the World Health Survey (WHS/SAGE Wave 0) in 2003 but none of these respondents were followed up. It 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, social cohesion, subjective well-being and quality of life, caregiving. The response rates at the household and individual levels were: 80.1 percent and 90 percent. More information: http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/5/study-description
Start Date
2007-01
End Date
2008-11
Data sources
  • Questionnaires
  • Physical measures
  • Biosamples
The household section of the survey covered all households in all ten administrative regions in Ghana. 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 were selected with a smaller comparative sample of respondents aged 18-49 years.
Selection Criteria
Minimum age
18
Newborns
Twins
Countries
  • Ghana
Ethnic Origin
Health Status

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample

Number of participants

Number of participants
5,110
Number of participants with biosamples
Data Collection Event
This wave was the second round of the World Health Survey which was conducted in 2003. It 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, social cohesion, subjective well-being and quality of life, caregiving. The response rates at the household and individual levels were: 86 percent and 80 percent. More information: http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/6/study-description
Start Date
2007-01
End Date
2008-12
Data sources
  • Questionnaires
  • Physical measures
  • Biosamples
The household section of the survey covered all households in the People's Republic of China. Two special administrative regions Hong Kong and Macau are excluded. Institutionalised populations are also 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 were selected with a smaller comparative sample of respondents aged 18-49 years.
Selection Criteria
Minimum age
18
Newborns
Twins
Countries
  • China
Ethnic Origin
Health Status
Supplementary Information
A large sample of persons aged 50 years and older, which is the focus of the study, and a smaller comparative sample of persons aged 18–49 years. In all countries, households were classified into one of these two mutually exclusive categories: one or more persons aged 50 years and older are selected from households classified as “50+ households” and one person aged 18–49 years from a household classified as an “18–49 household”. In the older households, all persons aged 50 years and older (for example, spouses and siblings) were invited to participate.

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample

Number of participants

Number of participants
14,813
Number of participants with biosamples
Data Collection Event
Data was collected for the World Health Survey (WHS/SAGE Wave 0) in 2002 but none of these households were followed up in Wave 1. Data collection took place in two phases. In the first phase data was collected from 5 provinces: Guangdong, Hubei, Jilin, Shaanxi, Zhejiang using paper and pencil face to face interviews. In the second phase data was collected from Shanghai, Shandong and Yunnan using computer-assisted face-to-face interviews. The response rates at the household and individual levels were: 92.8 percent and 100 percent. It 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, social cohesion, subjective well-being and quality of life. More information: http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/13/study-description
Start Date
2007-03
End Date
2010-07
Data sources
  • Questionnaires
  • Physical measures
  • Biosamples
The household section of the survey covered all households in 19 of the 28 states in India which covers 96% of the population. Institutionalised populations are excluded. The individual section covered all persons aged 18 years and older residing within individual households.
Selection Criteria
Minimum age
18
Newborns
Twins
Countries
  • India
Ethnic Origin
Health Status

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample

Number of participants

Number of participants
11,230
Number of participants with biosamples
Data Collection Event
This wave 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, social cohesion, subjective well-being and quality of life, caregiving. The response rates at the household and individual levels were: 88 percent and 68 percent. More information: http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/65/study-description
Start Date
2007-04
End Date
2007-08
Data sources
  • Questionnaires
  • Physical measures
  • Biosamples
The household section of the survey covered all households in all seven federal districts of the Russian Federation. Institutionalised populations are also 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 were selected with a smaller comparative sample of respondents aged 18-49 years.
Selection Criteria
Minimum age
18
Newborns
Twins
Countries
  • Russian
Ethnic Origin
Health Status

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample

Number of participants

Number of participants
4,355
Number of participants with biosamples
Data Collection Event
It 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, social cohesion, subjective well-being and quality of life. Response rates at the household and individual levels were: 79 percent and 83 percent. More information: http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/68/study-description
Start Date
2007-09
End Date
2010-08
Data sources
  • Questionnaires
  • Physical measures
  • Biosamples
The household section of the survey covered all households in all 32 federal states in Mexico. 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 were selected with a smaller comparative sample of respondents aged 18-49 years.
Selection Criteria
Minimum age
18
Newborns
Twins
Countries
  • Mexico
Ethnic Origin
Health Status

Recruitment

Sources of recruitment
  • General population
General Population
  • Selected sample

Number of participants

Number of participants
2,756
Number of participants with biosamples
Data Collection Event
It 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, social cohesion, subjective well-being and quality of life, caregiving. The response rates at the household and individual levels were: 59 percent and 51 percent. More information: http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/67/study-description
Start Date
2009-11
End Date
2010-01
Data sources
  • Questionnaires
  • Physical measures
  • Biosamples