Table 1.

The Means (M), Standard Deviations (SD), and Range of Ages, Tests, and other Measures for the Typically Developing (TD) and Specific Language Impairment (SLI) Groups

	Significant differences									Non-significant differences
Group	Age	1 TEGI EGC	2 TEGI 3S	3 TEGI PT	4 TEGI BE	5 TEGI DO	6 Spont. 3S	7 PPVT SS	8 GFTA	9 RIAS	10 PPVT RS	11 MLU
TD
M	3;3	61	53	50	79	61	63	114	104	118	65	3.65
SD	0;4	9	15	18	17	32	20	10	12	14	12	.74
Range	2;11 – 3;11	49 – 83	20 – 78	11 – 75	44 – 100	0 – 100	33 – 100	100 – 138	85 – 124	92 – 140	52 – 93	2.21 – 5.83
SLI
M	4;9	30	32	23	51	15	35	96	90	111	74	3.72
SD	0;8	15	22	20	26	24	24	11	13	16	20	.67
Range	4;0 – 6;1	12 – 59	0 – 70	0 – 61	0 – 100	0 – 80	0 – 81	76 – 118	64 – 110	89 – 142	45 – 105	1.84 – 4.77

Note. TEGI = Test of Early Grammatical Impairment. All TEGI scores represent percent correct.

¹TEGI EGC = TEGI Elicited Grammar Composite;

²TEGI 3S = TEGI Third Person Singular Probe;

³TEGI PT = Regular and Irregular Past Tense Probe;

⁴TEGI BE = Copula and Auxiliary Be probe;

⁵TEGI DO = Auxiliary Do probe.

⁶Spont. 3S = Percent accuracy third person singular during a spontaneous language sample.

⁷PPVT SS = Peabody Picture Vocabulary Test-4^th Edition Standard Score (M = 100; SD = 15).

⁸GFTA = Goldman Fristoe Test of Articulation – 2^nd Edition Standard Score (M = 100, SD = 15).

⁹RIAS = Reynold’s Intellectual Assessment Scale Standard Score (M = 100, SD = 15).

¹⁰PPVT RS = Peabody Picture Vocabulary Test Raw Score Raw Score.

¹¹MLU = Mean Length of Utterance in words based on a 30-minute spontaneous language sample of complete and intelligible utterances.