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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.