Study on Global Ageing and Adult Health

The Study on global AGEing and adult health (SAGE) is run by the World Health Organization. An objective for SAGE is to compile comprehensive longitudinal data on the health and well-being of adult populations and the ageing process across different countries, through primary data collection, secondary data analysis and cross-study collaborations.

SAGE baseline data (Wave 0, 2002–04) was collected as part of WHO's World Health Survey (WHS). A second round of data collection (Wave 1, 2007–10) is completed, expanding the sample sizes in each participating country (China, Ghana, India, Mexico, the Russian Federation and South Africa). Wave 2 (2015) data collection will be completed in 2015. Wave 3 is planned for 2017.

A baseline cohort for the six participating countries was created as part of the larger World Health Survey effort and contains data on the situation of 65,964 adults aged 18 years and older, including over 20,000 persons aged 50 years and older. Samples of these respondents were followed-up as a part of SAGE Wave 1 (2007–10) data collection in four of the six SAGE countries (Ghana, India, Mexico and the Russian Federation). Meta- and micro-data are in the public domain through WHO at http://apps.who.int/healthinfo/systems/surveydata/index.php/catalog/whs.

Weighted data for China, Ghana, India, Mexico, Russian Federation and South Africa are in the public domain (see Study on global AGEing and Adult Health). SAGE's first full round of data collection included both follow-up and new respondents in four 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. The target sample size was 5000 households with at least one person aged 50+ years and 1000 households with an 18- to 49-year-old respondent. 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. The pooled data set will include over 43,000 respondents (see table below).

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 question by question guide (Survey Manual) is available. 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.

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