Table 4

Factor loadings of cognitive tests

	First unrotated principal component	Obliquely rotated components
	General cognitive factor	Visuospatial factor	Verbal memory factor
Raven’s Standard Progressive Matrices	0.80	0.83	0.41
Benton Visual Retention Test	0.73	0.81	0.29
Visual reproduction	0.79	0.80	0.47
Logical memory	0.66	0.43	0.89
Rey Auditory-Verbal Learning Test	0.62	0.39	0.88
Verbal fluency	0.58	0.64	0.22
Digit-Symbol Substitution Test	0.75	0.74	0.47
Eigenvalues	3.53	3.27	2.30