Table 1.

Sample characteristics in autistic, DD, and two typically developing groups

	Autistic children (n = 23)		DD (n = 23)		18–20 months typical (TD1) (n = 22)		13–15 months typical (TD2) (n = 22)
	M	SD	M	SD	M	SD	M	SD
CA (months)	32.79	5.18	33.61	6.89	19.34a	.96	14.28a	.89
Range	23.40–40.57		18.93–42.67		18.03–20.93		13.10–15.80
MA (months)	22.09	1.91	21.17	6.44	19.32	1.91	14.64a	1.14
Range	12–36		12–35		17–23		12–16
IQb	62.96	10.70	59.87	16.26	98.95a	8.71	102.90a	9.26
Range	45–81		33–87		85–122		87–122

Significantly different from autistic group,

^ap < .01,

^bTested with Bayley’s Scale