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TableĀ 4 Number of items and sample sizes for analysis

From: The TIMSS 2019 Item Equivalence Study: examining mode effects for computer-based assessment and implications for measuring trends

Grade Total cases Mathematics Science
Valid items Average responses per item Valid items Average responses per item
Fourth grade (21 countries) 16,894 77 4199 82 4200
Eighth grade (11 countries) 9164 97 2278 110 2270
  1. Counts reflect resulting sample sizes after deleting problematic data and expected non-invariant items