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Correlations between accuracy and mean RT for correct answers.
| Grade | Correlation between accuracy and RT for correct answers |
| Cohort 1 | |
| Grade 1 | 0.53*** |
| Grade 2 | 0.45*** |
| Grade 3 | 0.32*** |
| Grade 4 | 0.52*** |
| Grade 5 | 0.42*** |
| Cohort 2 | |
| Grade 5 | 0.50*** |
| Grade 6 | 0.47*** |
| Grade 7 | 0.68*** |
| Grade 8 | 0.55*** |
| Grade 9 | 0.39*** |
***p < 0.001.
