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Demographic characteristic of each age group.
| Fifth-graders | Seventh-graders | ||
|---|---|---|---|
| N | 16 | 15 | |
| Age | 10;8 (7.66 months) | 12;8 (5.89 months) | p < 0.001 |
| Age range | 9;11–11;9 | 11;9–13;5 | |
| KTEA-II Math Concepts and Applications standard score | 114.06 (17.48) | 120.73 (9.71) | p > 0.2 |
| Integer Knowledge Test (out of 62) | 36.81 (7.34) | 51 (7.55) | p < 0.001 |
| Stroop interference standard score | 52 (6.53) (14 participants) | 50.47 (9.01) | p > 0.6 |
