Dimensionality, psychometric properties, and population-based norms of the Turkish version of the Chalder Fatigue Scale among adults

Table 5 Factor loadings for the items of the Chalder Fatigue Scale following principal component analysis with varimax rotation

The items of the CFS	Factor loadings (bifactor model of the CFS)		Factor loadings (unidimensional model of the subscales)
The items of the CFS	Factor 1 (physical fatigue)	Factor 2 (mental fatigue)	Factor 1^a (physical fatigue)	Factor 2^b (mental fatigue)
Item 1	0.752	0.086	0.738
Item 2	0.690	0.011	0.646
Item 3	0.680	0.268	0.735
Item 4	0.560	0.432	0.668
Item 5	0.785	0.216	0.821
Item 6	0.737	0.159	0.767
Item 7	0.748	0.237	0.791
Item 8	0.477	0.534		0.667
Item 9	0.005	0.863		0.819
Item 10	0.091	0.867		0.857
Item 11	0.264	0.430		0.544
Eigenvalues	3.842	2.362	3.837	2.145
Explained variance	34.927	21.468
Explained total variance	56.396		54.813	53.635

Bold indicates items loaded to factor 1 and factor 2, italic indicates items loaded on both factors
^aKaiser–Meyer–Olkin measure of sampling adequacy: 0.83, Bartlett’s test of sphericity: χ² = 1507.28, p < 0.001
^bKaiser–Meyer–Olkin measure of sampling adequacy: 0.66, Bartlett’s test of sphericity: χ² = 439.85, p < 0.001

ISSN: 1477-7525