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Table 1 LEAP twin sample characteristics (N = 106)

From: EU-AIMS Longitudinal European Autism Project (LEAP): the autism twin cohort

  Twin-pairs concordant for ASD n = 10 Twin-pairs discordant for ASD n = 28 Twin-pairs with typical development n = 15
Sex % males 80.0 62.5 46.7
Age (in years)
 Mean (SD) 15.3 (3.4) 15.8 (4.4) 16.8 (2.8)
Ethnicity % Caucasian = 100 Caucasian = 88.9 Black = 3.7% Mixed = 7.4% Caucasian = 100
Maternal education % > high school exam 30.0 48.1 53.8
Paternal education % > high school exam 44.4 41.2 46.2
Annual household income median € 34,000–45,000 45,000–68,000 68,000–90,000