. Author manuscript; available in PMC: 2015 Jul 7.

Published in final edited form as: J Speech Lang Hear Res. 2010 Aug 18;54(1):99–117. doi: 10.1044/1092-4388(2010/10-0010)

Table 1.

Participant characteristics.

Variable	SLI			ADHD			TD			F	Contrasts
Variable	M	SD	Range	M	SD	Range	M	SD	Range	F	Contrasts
Age (months)	94.20	7.9	84–107	94.30	7.4	85–107	93.95	6.4	85–107	0.10	1, 2, 3
Maternal education^a	3.35	0.90	2–5	3.55	0.90	2–5	3.85	1.20	1–5	1.20	1, 2, 3
Nonverbal^b	97.75	8.2	88–120	101.15	10.34	83–120	110.35	10.4	91–126	9.92^***	1, 2 < 3
Verbal^c	12.50	2.72	8–17	20.90	2.71	17–25	22.60	2.82	17–27	77.24^***	1 < 2, 3
Behavior^d	56.80	7.70	50–73	72.75	5.24	67–80	53.30	4.56	50–63	61.81^***	1, 3 < 2

1 = some high school; 3 = some college; 5 = some graduate school/advanced degree.

Naglieri Nonverbal Ability Test, standard score (M = 100, SD =15).

Clinical Evaluation of Language Fundamentals—Fourth Edition, Screening Test, total score (range for 5- to 8-year-olds = 0–28; criterion scores: 7-year-olds = 16; 8-year-olds = 18).

Child Behavior Checklist, DSM–ADHD syndrome scale, T score (higher values indicate elevated levels of attention/impulsivity difficulties; clinical cutoff = 65).

SLI = specific language impairment; TD = typically developing; DSM = Diagnostic and Statistical Manual of Mental Disorders; ADHD = attention-deficit/hyperactivity disorder.

^***

p < .001.