Table 2.

Descriptives and pre to post intervention comparison of the outcome variables.

Outcomes	N	Baseline (mean ± SD)	Post intervention (mean ± SD)	t-test	p	Cohen d
Children’s social and emotional skills
Self-Management/compliance	505	20.35 ± 3.69	21.45 ± 3.08	−10.81	<0.001	0.32
Peer-relations/empathy	508	13.49 ± 2.58	14.30 ± 2.16	−10.84	<0.001	0.33
Behavior problems
SDQ total difficulties score	517	11.62 ± 6.47	10.45 ± 6.30	7.124	<0.001	0.18
Social problem-solving strategies
Proportion of positive solutions	276	85.08 ± 17.88	88.81 ± 13.32	−3.76	<0.001	0.25
Proportion of aggressive solutions	276	3.59 ± 7.40	2.25 ± 5.67	−2.91	0.004	0.20
Persistence of positive solutions	276	81.62 ± 19.89	85.17 ± 14.42	−2.95	0.003	0.19