. Author manuscript; available in PMC: 2010 Oct 1.

Published in final edited form as: Alzheimer Dis Assoc Disord. 2009 Oct–Dec;23(4):384–388. doi: 10.1097/WAD.0b013e31819e0bfc

Table 2.

Psychometric Information on the Cognitive Domain Measures

Cognitive domain	M	SD	Range
Global cognition score	0.084	0.644	−1.449 to 1.410
Episodic memory	0.107	0.733	−1.648 to 1.896
Semantic memory	0.110	0.759	−1.777 to 1.363
Working memory	0.052	0.807	−1.543 to 2.208
Perceptual speed	0.115	0.747	−1.426 to 1.698
Visuospatial ability	0.026	0.923	−2.395 to 1.599

Note Each cognitive domain measure is the mean of the z scores on individual tests grouped in the domain.