Fig 1.
Research review diagram.
Fig 2.
Hedges’s g Formula.
Table 1.
Studies on enrichment interventions.
Fig 3.
Funnel plot of standard error by Hedges’s g.
Table 2.
Overall effect sizes and the heterogeneity tests of enrichment studies (random-effects model).
Fig 4.
Forest plot of effect sizes using the random effects model.
Table 3.
Effectiveness of enrichment on cognitive skills.
Table 4.
Effectiveness of enrichment on affective personal skills.
Table 5.
Effectiveness of enrichment on affective social skills.
Table 6.
Moderators of Effect Sizes for Studies of Enrichment Programs for Thinking Skills.
Table 7.
Moderators of Effect sizes for studies of enrichment programs for affective personal skills.
Table 8.
Moderators of effect sizes for studies of enrichment programs for affective social skills.