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Metacognitive ability scores in the three groups (Experiment 1)
| Group | Pretest | Posttest | Adjusted mean |
|---|---|---|---|
| Chess | 54.19 (9.76) | 52.92 (8.86) | 52.35 |
| Checkers | 54.51 (7.39) | 55.07 (8.81) | 53.86 |
| Control | 51.41 (9.09) | 52.22 (9.71) | 53.55 |
Note. Standard deviations are shown in brackets
