Table 1.
Group characteristics and performance on language measures.
| Group | Age (years;months) |
Maternal education (years) |
K–BIT | EVT | PPVT–III | SPELT | NWRT | TNL |
|---|---|---|---|---|---|---|---|---|
| SLI | ||||||||
| M | 7;2 | 14.36 | 95.36 | 86.43 | 97.36 | .71 | 7.00 | 83.07 |
| SD | 0;10 | 2.10 | 13.67 | 11.06 | 9.36 | .14 | 1.66 | 18.44 |
| AM | ||||||||
| M | 7;3 | 16.50 | 108.93 | 112.21 | 116.29 | .95 | 12.71 | 113.50 |
| SD | 0;10 | 2.10 | 16.41 | 11.38 | 9.29 | .05 | 2.49 | 15.31 |
| VM | ||||||||
| M | 5;7 | 16.79 | 102.29 | 106.50 | 114.07 | .83 | 11.57 | 106.55 |
| SD | 0;7 | 2.01 | 6.45 | 10.55 | 10.51 | .08 | 1.95 | 10.55 |
Note. K–BIT = standard scores on the Matrices section of the Kaufman Brief Intelligence Test; EVT = standard scores on the Expressive Vocabulary Test; PPVT–III = standard scores on the Peabody Picture Vocabulary Test—III (Dunn & Dunn, 1997); SPELT = proportion correct on the Structured Photographic Expressive Language Test—Second Edition or Preschool Edition (proportion correct was used because standard scores lower than 66 were not provided in the manual, rendering standard scores unavailable for 7 children in the specific language impairment [SLI] group); NWRT = standard scores on the Repetition of Nonsense Words subtest of the Developmental Neuropsychological Assessment (M = 10, SD = 3); TNL = standard scores on the Test of Narrative Language. Four children in the age-matched (AM) group and 3 children in the vocabulary-matched (VM) group did not take this test; however, they passed all the other tests, and there were no concerns about their language development.