Table 2.

3-factor latent cognitive structure of the two age groups as indicated by exploratory factor analysis. Columns 2 and 3 for the older adults’ group were swapped for easier comparison between the groups. vpa_imm_tot: Verbal Paired associates Immediate Recall, vpa_delay: Verbal Paired associates delayed Recall, vpa_fr_delay: Verbal Paired associates delayed Free Recall, associative_recall: Associative Recall, nihcog_rey: NIH Cognition Rey Auditory Verbal Learning: Immediate Recall, nihcog_psm: NIH Cognition Picture Sequence Memory, shipley_vocab: Shipley Vocabulary, nihcog_orr: NIH Cognition Oral Reading Recognition, nihcog_pva: NIH Cognition Picture Vocabulary, nihcog_lswm: NIH Cognition List Sorting Working Memory, nihcog_dccs: NIH Cognition Dimensional Change Card Sort, nihcog_flanker: NIH Cognition Flanker Inhibitory Control and attention, trails_b.A: trail making Task: B-A, sdmt_oral: symbol digits modality test.

	Young Adults Group			Older Adults Group
	Factor1	Factor2	Factor3	Factor1	Factor2	Factor3
vpa_imm_tot	0.79	-0.102	-0.107	0.998	0.006	-0.239
vpa_delay	0.741	-0.191	-0.04	0.935	-0.019	-0.206
vpa_fr_delay	0.446	-0.041	-0.079	0.771	0.056	-0.050
associative_recall	0.551	0.228	0	0.759	0.075	0.030
nihcog_rey	0.599	-0.035	0.096	0.505	-0.054	0.267
nihcog_psm	0.515	0.034	-0.009	0.362	-0.064	0.252
shipley_vocab	-0.099	0.837	-0.034	0.068	0.867	-0.091
nihcog_orr	-0.096	0.562	0.067	-0.018	0.622	0.178
nihcog_pva	-0.103	0.863	-0.093	0.001	0.731	-0.075
nihcog_lswm	0.152	0.498	0.088	0.084	0.032	0.307
nihcog_dccs	-0.008	-0.114	0.722	-0.090	-0.037	0.690
nihcog_flanker	-0.091	-0.006	0.768	-0.155	-0.001	0.685
trails_b_a	0.015	0.239	-0.068	-0.023	0.049	0.296
sdmt_oral	0.363	0.181	0.185	0.008	-0.069	0.589
Eigenvalues	2.494	2.214	1.201	3.471	1.698	1.758
Proportional variance	0.178	0.158	0.086	0.248	0.121	0.126
Cumulative variances	0.178	0.336	0.422	0.248	0.369	0.495
Cronbach alpha	0.77	0.73	0.7	0.86	0.78	0.62