Table 2.

Effect sizes according to outcome cluster.

Construct	k	Mean ES, dc	CI	SE	p	Q	p	I2 %
Quality of life	20	0.67***	0.41–0.99	0.133	<0.001	89.30	<0.001	78.72
Affect	23	0.56***	0.34–0.79	0.115	<0.001	88.65	<0.001	75.18
Interpersonal skills	9	0.85***	0.41–1.28	0.222	<0.001	38.61	<0.001	78.15
Cognitive skills	10	0.53**	0.13–0.93	0.204	0.009	28.51	0.001	68.43
(Psycho-)motor skills	10	0.65***	0.36–0.96	0.152	<0.001	14.61	0.102	38.39
Residual	6	0.47*	0.06–0.88	0.208	0.025	20.04	0.001	75.05

k, number of studies; ES, effect size; CI, confidence interval; SE, sampling error;

^*p < 0.05;

^**p < 0.01;

^***p < 0.001; Q, parameter of heterogeneity. The first p-value on the left refers to the mean effect size, whereas the p-value on the right side refers to Q.