Prospective thinking and decision making in primary school age children.

This was confirmed by paired-group Mann-Whitney U comparisons revealing significant differences in the frequency of children who passed between 6 and 10 years ( U (1) = 216, Z = 4.65, p < .0001), between 8 and 10 years ( U (1) = 300, Z = 2.9, p < .005), and a difference between age groups 6 and 8 years that just failed to reach significance ( U (1) = 386, Z = 1.94, p = .052; Fig. 2 ).

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