Preventive physiotherapy interventions for back care in children and adolescents: a meta-analysis

Table 2 Mean effect size and heterogeneity analysis for the two outcome measures in the posttest and follow-up.

Time point / Outcome measure	k	d ₊	95% C. I		Q	df	p	I ²
			d _l	d _u
Posttest: Behaviours	14	1.328	0.756	1.901	402.12	13	< .001	97%
Posttest: Knowledge	16	1.288	0.898	1.679	387.23	15	< .001	96%
Follow-up: Behaviours	6	1.795	0.672	2.919	236.48	5	< .001	98%
Follow-up: Knowledge	9	0.762	0.473	1.050	41.97	8	< .001	81%

k: number of studies. d ₊: mean effect size. d _l and d _u: lower and upper confidence limits of the 95% confidence interval around the mean effect size. Q: heterogeneity statistic. df: degrees of freedom. I ²: heterogeneity index.

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