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Table 1 Sample descriptive characteristics and scores on primary measures

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

  Mean (SD) Range
Chronological age (years) 14.83 (3.27) 10.25–21.92
Nonverbal age equivalenta (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 scoreb 43.33 (8.41) 36–71
Leiter-R Brief IQ composite growth score 465.07 (10.98) 443–492
PPVT-4 standard scorec 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
  1. 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.
  2. aLeiter-R Brief IQ age equivalence scores.
  3. b11 participants scored at the floor standard score of 36 on the Leiter-R.
  4. c3 participants scored at the floor standard score of 20 on the PPVT-4.