Table 2.
Description of the neuropsychological variables used in the present study
| Test variable | Variable description | Function |
| CERAD-NAB word list-encoding | Total number of correctly learned words across three learning trials (number of words per trial = 10). | Verbal episodic learning |
| CERAD-NAB word list-delayed free recall | Total number of correctly remembered words after a delay following encoding. | Verbal episodic memory |
| CERAD-NAB word list-savings | Proportion of correctly recalled words during delayed free recall relative to words learned in learning trial 3. | Verbal episodic memory |
| CERAD-NAB word list-discriminability | Percent of correctly recognized words from encoding. | Verbal episodic memory |
| CERAD-NAB word list-intrusion errors | Total number of intrusions committed during word list-encoding and delayed free recall. | Executive functions |
| CERAD-NAB figures-copy | Copy of four figures (circle, diamond, overlapping rectangles, cube). | Visuospatial ability |
| CERAD-NAB figures-delayed recall | Number of correctly reproduced figures from figures-copy following a delay. | Visual memory |
| CERAD-NAB figures-savings | Proportion correctly reproduced figures at figures-delayed recall relative to figures-copy. | Visual memory |
| Semantic fluency-animals | Number of animals produced within 1 minute. | Semantic memory |
| Trail making test A | Time required to connect circles numbered from 1 to 25 in ascending order. | Psychomotor speed |
| Boston naming test (15-items) | Number of spontaneously correctly named black and white line drawings (maximum = 15). | Language |
| Phonemic fluency | Number of words produced starting with the letter S within 1 minute. | Executive functions |
| Trail making test B | Time required to connect circles containing numbers (1– 13) and letters (A-L) in ascending and alternating order. | Executive functions |
| Mean IQCODE | Mean rating on the 16-item informant questionnaire on perceived changes in cognitive abilities in daily living during the preceding 2-years. | Informant report |