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Table 5 Results of the mixed-effects ANOVA for the qualitative moderator variable “research team” on the effect sizes obtained from measures of behaviours in the posttest

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

Research team k d + 95% C. I. ANOVA results
    d l d u  
Cardon, Geldhof et al. (Belgium) 7 1.504 0.706 2.302 Q B(3) = 14.36, p = .002
Gómez, Méndez et al. (Spain) 3 3.145 1.786 4.503 R 2 = 0.0
Spence et al. (USA) 2 −0.463 −2.001 1.074 Q W(10) = 366.01, p < .001
Park & Kim (South Korea) 2 0.205 −1.318 1.728  
Excluding the Méndez and Gómez’s (2001) study[20]:    
Cardon, Geldhof et al. (Belgium) 7 1.492 0.828 2.156 Q B(3) = 8.60, p = .035
Gómez, Méndez et al. (Spain) 2 0.642 −0.634 1.917 R 2 = 0.003
Spence et al. (USA) 2 −0.463 −1.759 0.832 Q W(9) = 249.56, p < .001
Park & Kim (South Korea) 2 0.205 −1.074 1.483  
  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 B: statistic for testing the significance of the moderator variable. Q W: statistic for testing the model misspecification. R 2: proportion of variance accounted for by the moderator variable.