Table 1.

Descriptive and inferential statistics of child and family characteristics by group

	Typical Development (N = 20; F = 10)			Down syndrome (N = 20; F = 7)			Autism Spectrum Disorders (N = 20; F = 4)
	M	SD	range	M	SD	range	M	SD	range	F(2, 58)	p	η2p
Child
Chronological age	24.70a	3.91	19.00–31.00	41.15b	6.71	28.00–48.00	52.95c	16.83	30.00–88.00	35.18	.01	.55
Developmental age	24.70	3.91	19.00–31.00	22.55	3.24	16.00–26.00	26.55	13.42	13.00–28.00	1.17	.32	.04
MLU	1.33a	.22	1.00–1.69	1.09ab	.13	1.00–1.47	.93b	.75	.00–2.43	3.08	.03	.12
n of utterances	32.00a	20.92	3.00–82.00	21.45a	17.90	1.00–64.00	6.95b	9.78	.00–35.00	11.11	.01	.28
Mother/family
Ge	35.05	4.70	27.00–45.00	36.85	6.28	27.00–50.00	35.95	3.39	30.00–43.00	.66	.52	.02
education level	4.65a	1.87	1.00–7.00	2.85b	1.39	1.00–6.00	4.35a	1.32	2.00–6.00	7.57	.01	.22
SES	42.05a	14.37	22.00–66.00	27.10b	12.91	.00–47.00	38.00ab	14.52	19.00–63.50	6.10	.01	.20

Notes: Means with different subscripts represent significant mean differences at Tukey HSD post-hoc tests for p < .05. TD children’s developmental age was assumed to correspond to their chronological age.