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TableĀ 1 Numbers of countries and students participating in the three PISA assessments, of which the major domains and numbers of items were included in the current study

From: Predictors of individual performance changes related to item positions in PISA assessments

PISA Countries Students Major domain Items included
2006 57 397,920 Science 103
2009 65 479,616 Reading 131
2012 68 485,490 Mathematics 109