“…Beside descriptive analyses, collected data have been mostly subjected to independent samples t-test (see, e.g., [25]), analysis of variance (see, e.g., [21,31,37,43]), correlation techniques (see, e.g., [22,27,28,33,45]), or to regression (linear, multiple) analyses (see e.g., [2,3,32,34]). Studies which applied factor analysis (see, e.g., [23,30]), principal component analysis (see, e.g., [36]), discriminant analysis (see, e.g., [2,44]), or mixed-effects models [40] are relatively rare.…”