Table 2. Factors and factor loadings^a from principal components factor analysis using 17 raw scores^b.

Factor Variable	Factor1: Attention/ Processing Speed	Factor2: Fluency/ Visuospatial	Factor3: Contextual Declarative Memory	Factor4: Working Memory/ Executive	Factor5: List-Learning Declarative Memory	Factor6: Construction	Factor7: Language
HVLT-R (total recall)	0.19	0.19	0.25	0.13	0.73	−0.14	−0.07
HVLT-R (delayed)	−0.05	0.13	0.08	−0.07	0.77	−0.09	0.32
Logical Memory I	−0.06	0.00	0.94	−0.01	0.06	0.08	0.05
Logical Memory II	0.04	0.02	0.95	−0.06	0.10	−0.06	−0.03
Digit Span forward	0.11	−0.08	−0.16	0.78	0.19	0.00	−0.14
Digit Span backward	−0.11	−0.06	0.03	0.78	−0.26	−0.08	0.23
Digit Symbol	0.77	0.12	−0.13	−0.04	−0.32	−0.03	0.16
Letter Number Sequencing	0.15	0.11	0.05	0.56	0.16	0.11	0.34
Trailmaking Part A	− 0.78	0.00	−0.05	0.01	−0.17	−0.12	−0.32
Trailmaking Part B	− 0.80	−0.08	−0.04	−0.15	−0.19	−0.07	0.16
Phonemic verbal fluency	0.24	0.45	−0.10	0.47	0.17	0.02	−0.16
Clock Drawing Test	0.01	−0.06	0.05	−0.02	−0.16	0.84	0.00
Semantic verbal fluency (animals)	0.06	0.83	0.06	−0.04	0.19	−0.02	0.12
Semantic verbal fluency (vegetables)	0.04	0.81	−0.02	−0.11	0.10	−0.05	−0.14
Boston Naming Test	0.15	0.01	0.00	0.08	0.13	0.06	0.85
Judgment of Line Orientation	0.11	0.56	0.00	0.31	−0.31	0.13	0.34
Cube copy	0.13	0.04	−0.03	0.00	0.01	0.79	0.09
% Total variance	12.02	11.51	11.27	11.22	9.72	8.39	7.97
% Cumulative variance	12.02	23.53	34.80	46.02	55.74	64.13	72.10

^aFactor loadings represent the correlation between the individual variable and each factor (after rotation); bold font and gray highlights indicate magnitude of factor loadings ≥ 0.40

^bPCFA was implemented on the standardized residuals from the linear regression of the raw score adjusted for age at visit, education, disease duration, and gender.