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Table 4 Probability of repeating a year, PISA scores, and mean differences by age of entry

From: Early school entrance and middle-run academic performance in Mexico: evidence for 15-year-old students from the PISA test

  All Regulars Prematures Difference Std. Err. t
Mathematics 413 415 407 8.3 2.43 3.396***
Science 422 426 414 11.6 2.38 4.858***
Reading 425 429 417 11.7 2.47 4.739***
  1. Difference: ***.-99% significance, **.-95% significance, *.-90% significance