Table 1.

Cognitive tests used to form cognitive domain scores

Cognitive domain	Cognitive tests
Perceptual speed	Symbol Digit Modalities test; Number Comparison
Episodic memory	Word List Memory, Word List Recall and Word List Recognition from the procedures established by the Consortium to Establish a Registry for Alzheimer’s Disease (CERAD); immediate and delayed recall of Story A from the Logical Memory subtest of the Wechsler Memory Scale-Revised; immediate and delayed recall of the East Boston Story
Semantic memory	Verbal Fluency; an abbreviated version of the Boston Naming Test; an abbreviated version of the National Adult Reading Test
Working memory	Digit Span Forward and Backward of the Wechsler Memory Scale-Revised; Digit Ordering; two indices from a modified version of the Stroop Neuropsychological Test
Visuospatial ability	Items from Judgment of Line Orientation and Standard Progressive Matrices