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Table 1 Descriptive statistics

From: Etiological influences on the stability of autistic traits from childhood to early adulthood: evidence from a twin study

Sample characteristics
  Sex Zygosity Highest parental education level
% Male % Female % MZ % DZ % Compulsory School % Upper Secondary School % College/university % Other
 Participants in CATSS-18 47% 53% 35% 65% M: 5% F: 12% M: 45% F: 47% M: 46% F: 38% M: 4% F: 3%
 Non-responders 52% 48% 28% 72% M: 4% F: 9% M: 45% F: 53% M: 48% F: 36% M: 3% F: 2%
Descriptive statistics
 A-TAC scale N Items Range Mean (SD) Cronbach’s α Skew
 Full scale, age 9/12 12 0–12 0.34 (0.86) .74 5.50
 Full scale, age 18 12 0–11 0.73 (1.07) .70 3.18
  1. M highest maternal education level, F highest paternal education level, A-TAC Autism-Tics, AD/HD and other Comorbidities inventory