The 2003 cohort of the Longitudinal Surveys of Australian Youth (LSAY) was drawn from the sample of 15 year-olds in Australian schools who participated in the Programme for International Student Assessment (PISA), conducted by the Organisation for Economic Cooperation and Development (OECD) in 2003. Australia was one of 41 countries that participated in PISA in 2003.
Rothman, S. (2007). Sampling and Weighting of the 2003 LSAY Cohort: Technical Report No. 43. https://research.acer.edu.au/lsay_technical/8