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Table 8 Results of the mixed-effects ANOVA for the qualitative moderator variable “research team” on the effect sizes obtained from measures of knowledge 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) 6 0.901 0.541 1.261 Q B(5) = 26.49, p < .001
Gómez, Méndez et al. (Spain) 4 2.043 1.600 2.485 R 2 = 0.718
Spence et al. (USA) 2 1.450 0.681 2.219 Q W(10) = 71.28, p < .001
Vidal et al. (Spain) 1 0.469 −0.388 1.327  
Park & Kim (South Korea) 2 1.739 0.985 2.492  
Kovacs et al. (Spain) 1 0.289 −0.516 1.094  
  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.