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

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

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%
  1. 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.