The Global Ageing Survey was the world's largest single survey of later life with 44,000 individuals from 24 countries at the time of its summarising. [1][2]
^"Research Conducted at University of Oxford Has Updated Our Knowledge about Quality of Life Research (Self-Reported Health Status of Older Adults in Malaysia and Singapore: Evidence from the 2007 Global Ageing Survey)", Health & Medicine Week, NewsRX LLC: 323, 2016-10-14, ISSN1531-6459