Table 1 Factor Retention and Composition Criteria

 Eigenvalue

2

Variance explained by F

≥ 1.0

 Scree Test

2

F Strength/relevance

Elbow location [52]

 Parallel Test

2

F Strength/relevance

Line intersection

 Factor Correlation

2–3

F Distinctiveness

<  0.85 [44, 53]

 Correlation

1

Sufficient association

≥ 0.3 [50]

 Loadings

2–3

Item determinacy

≥ 0.4¹ [50]

 Crossloading

2–3

Item distinctiveness

Diff. >  0.5 [46, 50, 51]

 # Items per factor

2–3

Model identification

>  2 [44, 50, 51]

 Uniqueness

2–3

Proportion unexplained by F

≤ 0.6 [44, 50]