Table 1.

Means (SD) and Ns for mild, moderate, and severe impairment across cognitive, adaptive, and autism symptom groups

	Mean (SD)
Impairment group	IQ	Vineland ABC	CS	SA	RRB
Mild-to-no	102.95 (13.13)	90.55 (5.88)	3.67 (0.73)	2.57 (0.68)	1.00 (0.00)
	n = 243	n = 65	n = 27	n = 21	n = 15
Moderate	78.76 (3.81)	76.9 (4.03)	6.35 (0.68)	4.70 (0.46)	5.00 (0.00)
	n = 103	n = 310	n = 298	n = 83	n = 44
Severe	53.75 (6.68)	62.98 (6.25)	9.13 (0.82)	7.89 (1.41)	8.53 (1.30)
	n = 380	n = 351	n = 401	n = 622	n = 667

IQ intelligence quotient, Vineland ABC vineland adaptive behavior composite, CS ADOS-2 comparison score, SA ADOS-2 social affect severity score, RRB ADOS-2 restricted and repetitive behavior severity score