TABLE 2.

Cross-validation of results with non-parametric tests.

	AD below norm (N = 35)	AD within norm (N = 23)	Wilcoxon test
Switches	M = 4.9; SD = 2.29	M = 10.12; SD = 3.19	W = 68.5, p = 0.0001
Age of acquisition	M = 4.23; SD = 0.6	M = 4.6; SD = 0.53	W = 257; p = 0.0211

AD, Alzheimer’s disease; m, mean; sd, standard deviation; W, Wilcoxon test value.