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. Author manuscript; available in PMC: 2015 Jul 8.
Published in final edited form as: Lang Speech Hear Serv Sch. 2011 Aug 15;42(4):520–535. doi: 10.1044/0161-1461(2011/10-0078)

Table 1.

Participant characteristics: Group means, standard deviations, and ranges.

SLI
 ADHD
 TD
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 SLI, ADHD,TD
Maternal educationa 3.35 0.90 2–5 3.55 0.90 2–5 3.85 1.20 1–5 1.20 SLI, ADHD, TD
Nonverbal abilitiesb 97.75 8.2 88–120 101.15 10.34 83–120 110.35 10.4 91–126 9.92*** SLI, ADHD < TD
Verbal abilitiesc 12.50 2.72 8–17 20.90 2.71 17–25 22.60 2.82 17–27 77.24*** SLI < ADHD, TD
ADHD symptomsd 56.80 7.70 50–73 72.75 5.24 67–80 53.30 4.56 50–63 61.81*** SLI, TD < ADHD

Note. SLI = specific language impairment, ADHD = attention-deficit/hyperactivity disorder, and TD = typically developing.

a

Five-point scale where 1 = some high school, 3 = some college and 5 = some graduate school/advanced degree.

b

Naglieri Nonverbal Ability Test (Naglieri, 2003) standard score (M = 100, SD =15).

c

Clinical Evaluation of Language Fundamentals—Fourth Edition Screening Test (Semel, Wiig, & Secord, 2004) total score (range for 5- to 8-year-olds = 0 to 28; criterion scores: 7 years = 16; 8 years = 18).

d

Child Behavior Checklist, DSM–ADHD subscale (CBCL; Achenbach & Rescorla, 2001), T score (higher values indicate elevated levels of inattention/ hyperactivity-impulsivity difficulties; scores > 65 usually indicate clinically significant problems).

*

p < .05

**

p < .01

***

p < .001.