Table 1 Factor analysis and total explained variance

Initial eigenvalues

Total

17.941

2.539

1.948

1.684

1.498

1.07

% variance

57.873

8.189

6.284

5.432

4.831

3.45

% accumulated

57.873

66.062

72.346

77.778

82.609

86.059

Extraction sums of squared loadings

Total

17.941

2.539

1.948

1.684

1.498

1.070

% variance

57.873

8.189

6.284

5.432

4.831

3.450

% accumulated

57.873

66.062

72.346

77.778

82.609

86.059

Rotation sums of squared loadings

Total

11.601

4.046

3.402

3.303

3.123

1.203

% variance

37.422

13.053

10.974

10.655

10.076

3.880

% accumulated

37.422

50.475

61.449

72.103

82.179

86.059

Cronbach’s alpha

0.881

0.880

0.860

0.797

0.868

0.886

0.850