Table 2 Meta regression random-effects model: test of the model

Simultabneous test that all coefiicients (excluding intercept) are zero

Q_model = 9.06, df = 1, p = 0.0026

Goodness of fit: Test that unexplained variance is zero

T² = 0.0208, Tau = 0.1442, I² = 38.56%, Q_resid = 30.766, df = 16, p = 0.0534

Proportion of total between-study variance explained by the model

R² = T²_explained/T²_total = 0.0352/0.0560 = 0.63