The effects of intergroup competition on prosocial behaviors in young children: a comparison of 2.5-3.5 year-olds with 5.5-6.5 year-olds.

In the envy game, we found that the frequency (44%) of altruistic choices (1, 2) was below the chance level (50%), although it did not reach statistical significance (Binomial test, p = 0.342, n = 71).

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Similarly, with respect to altruists (those who chose (1, 1) in the sharing game and (1, 2) in the envy game), we found that there was a decreasing trend for children to be altruists as age increased (34% of children at 2.5–3.5 years of age and 31% of children at 5.5–6.5 years of age) (Figure 3 ).

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