Table 2.

Exploratory factor analysis on measures of executive functioning from the AGN and VF tasks.

Measure	Descriptive data (N=186)		Factor Loadings
	Mean (SD)	Range	Attention	Inhibitory control errors	Mental Generativity	Shifting costs
AGN: omissions (shift blocks)	8.40 (6.78)	33	.99	−.07	.06	−.05
AGN: Total omissions	16.56 (13.02)	66	.99	−.05	.05	−.05
AGN: commissions (shift blocks)	10.30 (6.75)	36	−.04	.98	.04	−.05
AGN: Total commissions	19.62 (13.23)	66	−.06	.98	.04	−.04
VF: repetitions	.42 (1.12)	11	.14	.11	.95	.10
VF: correct responses	27.06 (8.37)	42	−.39	−.28	.47	−.20
AGN: shifting costs (msecs)	-11.65 (44.04)	320.72	−.09	.03	.06	.75
VF: disallowed responses	.99 (1.78)	12	−.03	.10	.01	−.69
Factor			Correlations among factors
Attention
Inhibitory control errors			.05
Mental generativity			−.14	−.09
Shifting costs			.06	−.05	−.07

The Kaiser-Meyer-Olkin measure verified the sampling adequacy for the analysis, KMO=.50. Bartlett's test of sphericity χ² (28)=1070.45, p<.001 indicated that correlations between measures were sufficiently large for exploratory factor analysis; Loadings of .4 or more were considered informative.

Descriptive data is presented for subjects with data on all measures of AGN and VF tasks. Minor variations in the descriptive data presented in Table 1, Table 2 are due to the use of pairwise deletion in Table 1 and listwise deletion in Table 2.