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. 2020 May 6;77(9):1–8. doi: 10.1001/jamapsychiatry.2020.0680

Figure 2. Twin Model Estimates by Birth Cohort.

Figure 2.

A, Clinical autism spectrum disorder (ASD): recorded diagnosis of ASD in the National Patient Register. B, Broad ASD: screening diagnosis of ASD defined by a score of 4.5 or more on the Autism-Tics, Attention-Deficit/Hyperactivity Disorder, and Other Comorbidities Inventory. The prevalence of each ASD diagnosis is given in place of thresholds here for ease of interpretation. The analyses of autistic traits show the variance components as the standardized total amounts of variance as opposed to proportions.