Table 3. Descriptive statistics for ABIS scales in factor analysis samples.

	Total				Females				Males
Sample 1	M	SD	Alpha	N	M	SD	Alpha	N	M	SD	Alpha	N
ABIS Attention	2.05	0.47	0.72	1549	2.07	0.47	0.74	939	2.04	0.46	0.68	608
ABIS Motor	2.06	0.51	0.75	1549	2.03*	0.50	0.75	939	2.10*	0.52	0.75	608
ABIS Non-planning	2.11	0.62	0.75	1549	2.06*	0.61	0.75	939	2.19*	0.62	0.75	608
Sample 2
ABIS Attention	2.08	0.53	0.77	657	2.08	0.55	0.80	377	2.08	0.51	0.74	278
ABIS Motor	1.94	0.56	0.81	657	1.89*	0.55	0.82	377	2.00*	0.56	0.80	278
ABIS Non-planning	2.14	0.63	0.71	657	2.06*	0.62	0.71	377	2.25*	0.63	0.71	278
Sample 3
ABIS Attention	2.25	0.70	0.77	285	2.15*	0.62	0.73	145	2.35*	0.76	0.79	140
ABIS Motor	2.38	0.99	0.88	285	2.36	1.04	0.90	145	2.40	0.94	0.86	140
ABIS Non-planning	2.35	0.77	0.70	285	2.27	0.76	0.72	145	2.44	0.78	0.66	140

Note. Sample 3 items were measured from 1-5, rendering comparisons to samples 1 and 2 uninformative. Summary statistics are shown for scale scores, which reflect the average of relevant scale items Two individuals from sample 2 reported neither male nor female gender.

^*Gender difference p < .05.