Patterns of autism spectrum symptomatology in individuals with Down syndrome without comorbid autism spectrum disorder

Table 1 Sample descriptive characteristics and scores on primary measures

	Mean (SD)	Range
Chronological age (years)	14.83 (3.27)	10.25–21.92
Nonverbal age equivalent^a (years)	5.16 (1.15)	3.42–8.42
SRS total T-score	60.57 (11.64)	42–90
SCQ raw score	6.48 (3.63)	1–14
Leiter-R Brief IQ standard score^b	43.33 (8.41)	36–71
Leiter-R Brief IQ composite growth score	465.07 (10.98)	443–492
PPVT-4 standard score^c	49.96 (16.77)	20–85
PPVT-4 growth score	140.67 (21.14)	89–179
TROG-2 raw score	27.36 (13.31)	7–72

Leiter-R growth scores are scaled from 372 to 548. PPVT-4 growth scores are scaled from 12 to 271. Sample size was n = 46 for Leiter-R, SRS, and SCQ; n = 45 for PPVT-4; and n = 44 for TROG-2.
^aLeiter-R Brief IQ age equivalence scores.
^b11 participants scored at the floor standard score of 36 on the Leiter-R.
^c3 participants scored at the floor standard score of 20 on the PPVT-4.

ISSN: 1866-1955