Table 1.

Descriptive statistics for developmental variables for the autism and typical groups.

Group	Background variables M (SD) range
	Chronological age years; months	Verbal abilitya	Nonverbal abilityb	SCQ score (out of 39)c
Autism	11; 2 (1; 5)	102.08 (12.00)	38.96 (7.10)	27.33 (4.87)
	9; 0–14; 4	80–126	26–50	18–35
Typical	10; 10 (1; 8)	104.42 (10.30)	37.08 (6.39)	4.75 (3.44)
	8; 2–14; 4	82–120	24–54	0–11

Note:

^aBritish Picture Vocabulary Scale (2nd ed.) (Dunn et al., 1997).

^bRaven's Standard Progressive Matrices (Raven, Court, and Raven, 1992).

^cElevated scores reflect increased symptomatology.