Table 3.

Social skills group training effect sizes (Hedges’ g) from baseline to post-test

Meta-analysis	k	Total N	Q	Hedges’ g	z	Ʈb	Ib (%)
All outcomes from T1 to T2	13	967	144.49***	a0.96*** b0.60***	0.52	0.88	92.38
Social outcomes from T1 to T2	9	412	156.81***	1.91**	2.56	4.87	87.66
Behavioural/emotional challenges from T1 to T2	8	790	18.14**	− 0.14	− 1.16	0.07	65.96
Autism characteristics from T1 to T2	8	782	49.5***	− 0.10	− 0.38	0.51	89.16
All outcomes from T1 to T3	6	711	122.24***	1.43	1.54	4.98	99.31

ASD autism spectrum disorder, CI confidence interval, T1 baseline, T2 posttest, T3 follow-up

^aUnadjusted

^bAdjusted

**p < 0.01; ***p < 0.001