The average score of the country on the science assessment. Across the 30 OECD countries the scores are statistically standardised to have an average of 500 points.
The rank of the country compared to other OECD countries.
The rank of the country compared to all the countries which participated in PISA 2006.
Year 2000 the survey concentrated on literacy, 2003 on problem solving and 2006 on science.