Table 1. Distribution of data with regard to all the study parameters.

Parameter		Kolmogorov-Smirnov statistic	Df	P-value
Loading	Yield strength (MPa)	0.024	60	0.31
	Flexural modulus of elasticity (GPa)	0.068	60	0.2
	Spring back ratio	0.083	60	0.2
Unloading	Yield strength (MPa)	0.0246	60	0.31
	Modulus of elasticity (GPa)	0.065	60	0.2
	Spring back ratio	0.092	60	0.2