Table 5.

Results of the multiple meta-regression model applied on the retention success rates, taking as predictors the sample size, the type of material (dichotomized), the cavity form, and the assessor blinding (k = 27).

Predictor variable	bj	t	p	Model fit
Intercept	−1.942	−0.89	0.384	F(4, 22) = 6.62, p  =  0.001
Sample size	−0.0002	−0.06	0.956	R2  =  0.45
Type of material	0.831	1.51	0.146	QE(22) = 114.86, p  < 0.0001
Cavity form	1.558	1.68	0.108
Assessor blinding	−0.11	0.19	0.845

b_j = regression coefficient of each predictor. t = statistic for testing the significance of the predictor (with 22 degrees of freedom). p = probability level for the t statistic. F = Knapp-Hartung’s statistic for testing the significance of the full model. Q_E = statistic for testing the model misspecification.