Table 3.

Factor loadings for each variable included in the confirmatory PCA.

Factor 1: Working and short-term memory		Factor 2: Selective and divided Attention		Factor 3: Executive functioning		Factor 4: Lexical and semantic abilities
Test variable	Loading	Test variable	Loading	Test variable	Loading	Test variable	Loading
Digit span forward	0.740	Ruff 2&7 (speed)	0.375	TMT-A (duration)	0.410	TRT	0.808
Digit span backward	0.522	Ruff 2&7 (accuracy)	0.351	TMT-B (duration)	0.202	Vocabulary test	0.890
Digit span sequential	0.652	TAP (auditive reaction time)	0.537	STROOP (reading interference)	0.682	LDT (reaction time difference)	0.678
2-back task (reaction time)	0.451	TAP (visual reaction time)	0.710	STROOP (naming interference)	0.804
2-back task (errors)	0.700	TAP (errors)	0.401
Reading span (% correct)	0.378	WAF-S (reaction time)	0.720
		WAF-S (errors)	0.490

Factor loadings higher than 0.5 are highlighted with bold font.