Table 3.

Mathematical ability scores in the three groups (Experiment 2)

Group	Pretest	Posttest	Adjusted mean
Chess	2.13 (1.26)	2.50 (1.41)	2.30
Go	1.81 (1.08)	1.62 (1.20)	1.63
Control	1.53 (1.13)	2.40 (1.55)	2.60

Note. Standard deviations are shown in brackets