Table 3.

Results of Pearson correlation coefficients.

Factor	Mechanical Property	Pearson Coefficients	Significance
Particle size	Tensile strength	0.116	0.447
	Tensile modulus	0.155	0.309
	Elongation at break	−0.143	0.349
	Fracture work	−0.111	0.468
Filling content	Tensile strength *	−0.962	0.000
	Tensile modulus *	0.904	0.000
	Elongation at break *	−0.784	0.000
	Fracture work *	−0.815	0.000

Note: * means significant at the 0.01 level (two-tailed).