Table 3.

Criteria used for the classification of cognitive impairment, considering the number of tests administered to assess each cognitive domain

Cognitive domain	Test	Criteria for impairment
Verbal memory	WMS III-Logical memory I and II	2 scores <1.5 SD or 3 scores <1 SD
Visual memory	WMS III-Visual reproduction I and II	2 scores <1.5 SD or 3 score <1 SD
Attention/information processing speed	WAIS III-Digit-Symbol-Coding and Symbol search	2 scores <1.5 SD or 3 scores <1 SD
	Trail making test, part A
	Stroop test-word reading
Executive functions	Stroop test (colour naming and word colour naming)	At least three scores <1.5 SD or 2 scores <2 SD
	Trail making test, part B and B-A
	Phonemic fluency-letters M, R and P
	Phonemic fluency-categories of animals
	WMS III-digit span
Language	Token test-short-form	Score <2 SD

Verbal memory and visual memory are assessed with two tasks each, and three independent scores are retrieved for each cognitive domain.

WAIS III, Wechsler Adult Intelligence Scale Third Edition; WMS III, Wechsler Memory Scale Third Edition.