marginally significantp < 0.016
Post hoc analysis of the two-way interactions showed a significant pre-to-post increase in peer-rated cooperation in the enriched PE group ( t (90) = −3.21, p = 0.002, Cohen’s d = 0.26) but a non-significant decrement in the traditional PE group ( p = 0.166), leading to a large, though marginally significant (for adjusted p < 0.016) group difference at post-test ( t (179) = 2.38, p = 0.018, Cohen’s d = 0.62) ( Figure 5 ).