Table 1.

Descriptive statistics for the intelligence sub-tasks, executive function tasks, clinical measures, and disfluencies

Task	N	Mean	SD	Min	Max	Skew	Kurtosis
IQ tests
Matrix/Block	106	11.64	2.81	2.00	18.00	−.36	1.16
Vocabularya	106	3.44	.40	2.24	4.36	−.18	.26
Similaritiesa	106	3.44	.41	2.45	4.36	.15	−.38
EF tasks
Stop signal RTc	106	5.47	.24	4.55	6.13	.06	2.10
Stroop	106	9.64	8.36	−11.39	35.81	.24	.91
Trails B – A	106	28.39	14.73	−8.00	80.69	.61	1.78
Perseveration errorsb	106	.17	.06	.05	.33	.20	.09
Clinical measures
Hyperactiv/Impulsivc	106	3.88	.14	3.58	4.28	.44	.67
Disfluencies
Unfilled pausesd	106	10.31	14.27	−23	44.41	−.29	.20
Filled pausesd	106	−14.47	10.81	−23	12.64	.74	−.90
Repetitionsd	106	−14.97	9.55	−23	3.65	.50	−1.43
Repairsd	106	−5.90	13.18	−23	22.38	.12	−.81

Note.

^asquare root transformation,

^binverse transformation,

^clogarithm transformation, and

^drationalized arcsine transformation (Studebaker, 1985).