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Table 1 Demographic data and IQ profiles of probands, unaffected siblings (US), and typically developing controls (TD)

From: ADHD-related symptoms and attention profiles in the unaffected siblings of probands with autism spectrum disorder: focus on the subtypes of autism and Asperger’s disorder

Group Autism(n = 122) AS(n = 77) US of autism(n = 122) US of AS(n = 77) TD(n = 196)  
x 2, F P
Male (%) 108 (88.5%) 70 (90.9%) 61 (50.0%) 38 (49.4%) 129 (65.8%) 73.49 <.001
Age: mean ± SD (age range) 10.4 ± 2.5
(6.0–16.0)
11.5 ± 2.9
(6.0–18.0)
10.6 ± 3.2
(6.0–18.0)
10.7 ± 3.0
(6.0–17.0)
11.1 ± 2.9
(7.0–18.0)
2.25 0.063
IQ profiles
Verbal IQ 88.18 ± 23.82 109.04 ± 12.78 105.36 ± 14.38 111.03 ± 9.70 112.13 ± 11.18 44.77 <.001
Performance IQ 95.63 ± 20.62 105.68 ± 15.17 107.39 ± 15.26 106.76 ± 12.81 110.89 ± 13.04 17.48 <.001
Full-scale IQ 91.11 ± 21.83 107.97 ± 12.86 106.61 ± 14.44 109.57 ± 10.41 112.44 ± 11.37 36.85 <.001